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Nissan 370Z Forum (http://www.the370z.com/)
-   Engine & Drivetrain (http://www.the370z.com/engine-drivetrain/)
-   -   4.08 Frontier gear swap (http://www.the370z.com/engine-drivetrain/18209-4-08-frontier-gear-swap.html)

jdonadio 10-22-2011 02:01 PM
did you find info for the gear swap for your 7AT, I'm interested as well....

370Zfeeler 02-24-2012 06:28 PM
Quote:
Originally Posted by jdonadio (Post 1371845)
did you find info for the gear swap for your 7AT, I'm interested as well....
Back from the death!!

Would Also like to know about this gears on 7AT
Anyone would chime in??? :confused:

e30cabrio 04-21-2012 08:24 AM
Quote:
Originally Posted by AggieAv8r (Post 1345804)
agreed - I'm still technically "breaking them in" but I have access to a runway where I'll soon test 'em out. But practically speaking, no, no noticeable difference. The car just feels like it needs to keep going .... so fun to drive now.

On the downside, and I'm hoping maybe jnaut and tranceformer will chime in, I talked to the shop that put em in today. Told him about the whine under light acceleration, just enough drive input to maintain speed, and he acted like there was nothing more he could do - he said the mesh pattern was perfect, and then gave me the dreaded "some gear sets just whine ... can't tune em out"

Told me to drive it for awhile and let everything "seat" and see if it changes any. I'm also going to switch to Redline 75W90 to see if it helps any. But I don't think it will. Any reason to believe that this may work itself out after break in ???? That just doesn't make sense to me ....

So I'm hoping you guys can give me some ammo to go back with ... as far as specific adjustments. Anyone else see this? Any experience with pinion preload adjustments? Mesh patterns that work better than others i.e. more toe, or more heel patterns? Anything that will convince him to break into it again and make an adjustment.

I found this thread (and forum) via a search trying to find if the pinion sleeve and nut came with the gear set.

I have had these and a quaife in my 06 350Z for over a year/10k and just started whining horribly. It started as you described.

My differential was assembled by a shop that had no clue and is now out of business. They did not replace anything but the ring and pinion and apparently did not properly set the preload. It is currently at a shop that only deals in diffs, transfer cases and transmissions.

As I did not want to lose my car I swapped the open base diff back in. WHAT A DIFFERENCE.

Luckily it looks like there was no damage.

http://i20.photobucket.com/albums/b2...o/f5d4f442.jpg

http://i20.photobucket.com/albums/b2...o/0129a271.jpg

http://i20.photobucket.com/albums/b2...o/49355832.jpg

http://i20.photobucket.com/albums/b2...o/11085c4f.jpg

282.02 (with a discount) in differential rebuild parts.

http://i20.photobucket.com/albums/b2...o/b6397b19.jpg

Dwnshift 04-26-2012 08:50 AM
FYI....We run this final drive in our RC in t Conti challenge. Final drive seap is one of yhe bestbthing you can do for improved acceleration...espc for a track car.

KB2 06-09-2012 12:49 PM
any word on this for the 7at?

Nuki 06-28-2012 06:11 AM
After reading this thread, this is now on my short list of mods to do to the Nismo. I would imagine this would be one of the very best things to do if you're staying with straight bolt ons. I'm kind of surprised no one has come up with an ecu flash to adjust the issues with SRM (I would assume since its not a mechanical thing, this could be programmed somehow.)

Good info.


(I'm gonna look and see if there are any reviews of the 4.3 FD.)

L33T Z34 06-29-2012 06:37 AM
I've got the 4.36 final drive sitting on the shelf in my garage. I can't wait to get this installed w/the polyurethane rear diff mounts over the upcoming winter.

atx370z 06-29-2012 08:35 AM
Quote:
Originally Posted by Nuki (Post 1795513)
After reading this thread, this is now on my short list of mods to do to the Nismo. I would imagine this would be one of the very best things to do if you're staying with straight bolt ons. I'm kind of surprised no one has come up with an ecu flash to adjust the issues with SRM (I would assume since its not a mechanical thing, this could be programmed somehow.)

Good info.


(I'm gonna look and see if there are any reviews of the 4.3 FD.)
I asked Uprev about this and they said that currently they are not able to change the shift points for the SRM, but would look in to it. This was several months back and I'm pretty sure nothing came of it.

DR_ 06-29-2012 09:08 AM
It seems to me if a good shop would offer installed packages there would be lots of demand. This is what happened in the S2000 community and it worked great. A quick search shows lots of doner diffs out there so getting a core isn't as bad as it was for the S2000. This allows you to buy a core and send it off to get the work done and not be down while getting the gears installed. The shop could install a good LSD while in there as well. Hopefully this has already happened and I just haven't read about it yet.

babbagandu 07-09-2012 10:34 PM
What's a rough estimate of what a good shop can be expected to charge for installing new gears?

luigi90210 11-28-2012 06:32 PM
Quote:
Originally Posted by babbagandu (Post 1813785)
What's a rough estimate of what a good shop can be expected to charge for installing new gears?
depends on the shops hourly charge and how long it takes them

just ask the shop you have in mind how much it would cost and they should be able to help you out

ON TOPIC
is there a noticeable difference with taller gears?

dthem370 11-29-2012 07:11 AM
Quote:
Originally Posted by luigi90210 (Post 2037570)
depends on the shops hourly charge and how long it takes them

just ask the shop you have in mind how much it would cost and they should be able to help you out

ON TOPIC
is there a noticeable difference with taller gears?
I'm getting 4.08s installed next week on Dec. 6th on my 7AT. I will do a full review on them. As for price I got quoted 500 bucks.

luigi90210 11-29-2012 10:54 PM
Quote:
Originally Posted by dthem370 (Post 2038124)
I'm getting 4.08s installed next week on Dec. 6th on my 7AT. I will do a full review on them. As for price I got quoted 500 bucks.
im looking forward to your review, i have a 6MT but i personally dont know much about gearing aside from taller gears make you accelerate faster, and shorter gears make your top speed higher

any real world gains by doing a mod like this? and will SRM work after this, if not than can a tune fix SRM?

dthem370 11-30-2012 01:08 AM
Quote:
Originally Posted by luigi90210 (Post 2039598)
im looking forward to your review, i have a 6MT but i personally dont know much about gearing aside from taller gears make you accelerate faster, and shorter gears make your top speed higher

any real world gains by doing a mod like this? and will SRM work after this, if not than can a tune fix SRM?
Based on my research, SRM will be off by like 300 RPMS for the manuals and people say they don't even realize it that much. There is no fix for that as far as I know. Also, someone reported the SRM will automatically turn off once you exceed speeds around 120MPH, but after turning the car off and back on it works fine again.

The gears (4.08s) will make you accelerate much faster. It can take off a few tenths of your quarter mile time and improve your 60' times.

You will lose top end speed, meaning you can know only go to something like 180mph instead of like 200mph. Realistically I don't think any of us will ever go that fast so that's not much of a concern for me.

You will lose some MPG because your RPMs will be higher (500RPMs higher) when cruising around, especially on the freeway. I personally don't mind it b/c if I was concerned about MPG I wouldn't have bought the Z in the first place.

The hardest thing is keeping traction with the gears from what I read. So make sure if you upgrade the gears to have a good set of tires and a good differential (stock VLSD at the minimum).

I will post more info soon when I create my review.

Presto 11-30-2012 02:40 AM
Quote:
Originally Posted by dthem370 (Post 2038124)
I'm getting 4.08s installed next week on Dec. 6th on my 7AT. I will do a full review on them. As for price I got quoted 500 bucks.
Can you list what all parts you bought and from which vendor?
Are you keeping the stock vlsd or aftermarket LSD like os given or quaife?

luigi90210 11-30-2012 04:25 AM
Quote:
Originally Posted by dthem370 (Post 2039681)
Based on my research, SRM will be off by like 300 RPMS for the manuals and people say they don't even realize it that much. There is no fix for that as far as I know. Also, someone reported the SRM will automatically turn off once you exceed speeds around 120MPH, but after turning the car off and back on it works fine again.

The gears (4.08s) will make you accelerate much faster. It can take off a few tenths of your quarter mile time and improve your 60' times.

You will lose top end speed, meaning you can know only go to something like 180mph instead of like 200mph. Realistically I don't think any of us will ever go that fast so that's not much of a concern for me.

You will lose some MPG because your RPMs will be higher (500RPMs higher) when cruising around, especially on the freeway. I personally don't mind it b/c if I was concerned about MPG I wouldn't have bought the Z in the first place.

The hardest thing is keeping traction with the gears from what I read. So make sure if you upgrade the gears to have a good set of tires and a good differential (stock VLSD at the minimum).

I will post more info soon when I create my review.
i definitely look forward to it, i have been toying with the idea recently but the fact that srm will shut off is kind of a downer(not enough to put it off though, it just means i have to learn how to heel and toe), im really interested in how it will increase acceleration, tbh i feel the Z takes off pretty quickly stock granted my last car was a turbo eclipse and the turbo lag on there was pretty bad(i didnt spool until 3.5K)

tranceformer 11-30-2012 07:57 AM
Quote:
Originally Posted by dthem370 (Post 2039681)
Based on my research, SRM will be off by like 300 RPMS for the manuals and people say they don't even realize it that much. There is no fix for that as far as I know. Also, someone reported the SRM will automatically turn off once you exceed speeds around 120MPH, but after turning the car off and back on it works fine again.

The gears (4.08s) will make you accelerate much faster. It can take off a few tenths of your quarter mile time and improve your 60' times.

You will lose top end speed, meaning you can know only go to something like 180mph instead of like 200mph. Realistically I don't think any of us will ever go that fast so that's not much of a concern for me.

You will lose some MPG because your RPMs will be higher (500RPMs higher) when cruising around, especially on the freeway. I personally don't mind it b/c if I was concerned about MPG I wouldn't have bought the Z in the first place.

The hardest thing is keeping traction with the gears from what I read. So make sure if you upgrade the gears to have a good set of tires and a good differential (stock VLSD at the minimum).

I will post more info soon when I create my review.
Quote:
Originally Posted by luigi90210 (Post 2039726)
i definitely look forward to it, i have been toying with the idea recently but the fact that srm will shut off is kind of a downer(not enough to put it off though, it just means i have to learn how to heel and toe), im really interested in how it will increase acceleration, tbh i feel the Z takes off pretty quickly stock granted my last car was a turbo eclipse and the turbo lag on there was pretty bad(i didnt spool until 3.5K)
SRM does shut off around 120mph. But it doesn't turn back on after a while, even after a restart.. atleast with my car that's the case.

Yes it does make the car feel faster, but IMO the 1/4 mile times is second place to the 'fun factor' of the 4.08 gears.

And yes, get some good tires!

dthem370 12-02-2012 04:38 AM
Quote:
Originally Posted by Presto (Post 2039710)
Can you list what all parts you bought and from which vendor?
Are you keeping the stock vlsd or aftermarket LSD like os given or quaife?
I will list the parts and stuff I got when I create my review. I personally kept the stock VLSD but I wish I had the extra money to get a better limited slip. I should be fine though since I will be driving it mostly on the street and my car will see very little track time.

Z eliminator 12-02-2012 08:41 AM
your cruse control wll not work if you have a 7 AT

SPOHN 12-03-2012 07:45 PM
Where are most of you guys buying your 4.08 gears from? I'm always searching for best price.

B&W_Evader 12-04-2012 09:33 AM
Just saw this thread for the first time... I love this stuff:tup:

I swear I smelled gear oil when looking at those pictures with the diff torn appart.

luigi90210 12-05-2012 01:14 AM
Quote:
Originally Posted by SPOHN (Post 2044606)
Where are most of you guys buying your 4.08 gears from? I'm always searching for best price.
i think nissan has the cheapest gears, they are off the frontier 2.5 i believe, dont quote me on that though

SPOHN 12-05-2012 05:56 AM
^ thanks. I'll look it up.

atx370z 12-08-2012 03:53 PM
Just to add my .02 to this thread... I've been running 4.08 gears in my Z for about 6 months now and love them. Acceleration is GREATLY improved. I don't notice it much now since I've had them for a while, but I'm sure if I were to take a spin in a Z with stock rear end, I would notice.

My gas mileage dropped 2mpg... But I do have a little bit of a lead foot shifting at around 4-5k each gear.

SRM works, but not as good as with the stock rear end. Downshifting while decelerating is smooth.. Anything else is a little "jerky" until you get used to it. Also during high speed runs (120-130mph+) the SRM will shut itself completely off and won't come back on until you turn the car off for a bit then turn it back on. Not sure why... Not a big deal.

Top speed is hardly affected... I can still hit 140mph easily (and quickly) with room to go. I don't have big enough balls to see what the speed is at red line in 6th gear... But I know it's FAST.

Traction was definitely an issue with the OEM Bridgestone RE050's... Even with 305's in the rear. Since I upgraded to the RE-11's... I hardly have any traction problems and the car pulls like a freight train. Best tires, in my opinion, hands down.

That is all... :D

dthem370 12-08-2012 03:59 PM
Quote:
Originally Posted by atx370z (Post 2051518)
Just to add my .02 to this thread... I've been running 4.08 gears in my Z for about 6 months now and love them. Acceleration is GREATLY improved. I don't notice it much now since I've had them for a while, but I'm sure if I were to take a spin in a Z with stock rear end, I would notice.

My gas mileage dropped 2mpg... But I do have a little bit of a lead foot shifting at around 4-5k each gear.

SRM works, but not as good as with the stock rear end. Downshifting while decelerating is smooth.. Anything else is a little "jerky" until you get used to it. Also during high speed runs (120-130mph+) the SRM will shut itself completely off and won't come back on until you turn the car off for a bit then turn it back on. Not sure why... Not a big deal.

Top speed is hardly affected... I can still hit 140mph easily (and quickly) with room to go. I don't have big enough balls to see what the speed is at red line in 6th gear... But I know it's FAST.

Traction was definitely an issue with the OEM Bridgestone RE050's... Even with 305's in the rear. Since I upgraded to the RE-11's... I hardly have any traction problems and the car pulls like a freight train. Best tires, in my opinion, hands down.

That is all... :D
Glad to hear that man. I'm putting my RE-11s on next week and I just got the gears yesterday. Good to know that the traction will be better.

atx370z 12-08-2012 03:59 PM
Quote:
Originally Posted by SPOHN (Post 2044606)
Where are most of you guys buying your 4.08 gears from? I'm always searching for best price.
Just get the gear and install kit from Z1... You'll pay a little more vs piecing it together yourself, but at least you'll know you're getting everything you need for a successful install.

gtabaz 01-26-2013 01:59 PM
Can someone list the parts needed for these mods and maybe where to get them =] Thanks!

Dwnshift 01-26-2013 08:48 PM
We have hit well over 170...but we rev a little higher with ours ;)
You should be able to purchase the set through Nissan Motorsports parts as well.

G37Sam 04-08-2013 06:55 AM
Quote:
Originally Posted by gtabaz (Post 2132069)
Can someone list the parts needed for these mods and maybe where to get them =] Thanks!
+1 I'd really appreciate that

blumango 11-09-2013 09:34 PM
Hi,

Thanks for the part numbers here!

Do you happen to know the part number for a sport manual pumpkin too?

Quote:
Originally Posted by jnaut (Post 530450)
the diff housing are the same between, the difference is inside , the carrier ( where the ring gear bolts up). you would need to change that carrier plus the stub shaft and axle if yourgoing to run lsd or get a manual rear end out of a 350,g35,g37,370z. then do the gear swap. now if you dont want to go as agressive you can put in the stock gears out of a manual 370z, as the auto 370z has 3.3 axle ratio and the manual has 3.6.in the f.s. section there a stock lsd with gears. he prolly has everything you need to do 3.6 ratio swap for minimal money.



1. Both lsd and non-lsd manual 370z take the same gears. no mod needed to do the 4.08 ratio swap. straight install.

get parts from 2006 nissan frontier xe 2.5l manual trans

1. 38100-0c760 ring/pinion
2. 38165-0c020 pinion crush sleeve
3. 43262-01p1a pinion nut
4. 38154-0c000 spacer between pinion bearing and drive gear
5. 38120-ec000 pinion bearing
6.gasket maker
7.gear oil


optional parts( i did not use these but the installer might request that you repalce them)
8. 38140-0c000 pinion bearing
9. input shaft seal

blumango 11-10-2013 09:06 AM
Quote:
Originally Posted by dthem370 (Post 2042564)
I will list the parts and stuff I got when I create my review. I personally kept the stock VLSD but I wish I had the extra money to get a better limited slip. I should be fine though since I will be driving it mostly on the street and my car will see very little track time.
Sorry guys, I just noticed that the part number is listed somewhere already. Managed to find them eventually.

Dthem, can I confirm a couple of things:

I have a Sports 7AT with VLSD. Can I buy a manual open rear diff without VLSD and transfer mine over? Or, if budget allows for me to purchase a Quaife, can I install it inside the manual rear open diff that comes without VLSD? Or must I buy a sports manual rear diff with VLSD? I'm about to make my order so I just want to be sure.

Thanks!

Joetib07 09-16-2014 08:03 PM
Hey guys I'm new to the forum and got a '12 370z sport 6spd and wondering if you guys have had any problems with the spacer 38154-0c000, I'm currently in the middle of doing my 4.08 swap with the list that Jnaut provided and wanted to make sure it's the correct spacer before pressing everything back together

Juice14 01-20-2015 11:40 PM
Old tread, first of all thanks for the info from all you guys.

I know its been a long time since some of you installed the 4.08 gears, but I wanted to ask you about having a lightweight flywheel + 4.08 gears combo.

Does the car feel "too responsive and jumpy" for DD? I want to do the 4.08 gear upgrade but in the future i'll also do the lighter flywheel so maybe 4.08 is not the best option for me, maybe 3.90?

what's your input on this?

thanks ahead of time

12nismo 01-21-2015 07:51 AM
I have the Southbend 13lb aluminum flywheel, 4.08's and an NST lightweight crank pulley and the car is VERY responsive but I wouldn't say too responsive. In all honesty, each of the listed mods aren't THAT noticeable by themselves (I did one at a time) but together that make for a nice bump in the cars pep. IMO the flywheel, pulley and gears all compliment each other. if you're doing gears, go with the 4.08's...I doubt you'll feel much of a defference with the 3.90's. Definitely not "too jumpy" when paired with a lightweight flywheel.

forza370z 01-21-2015 12:51 PM
Quote:
Originally Posted by 12nismo (Post 3087716)
I have the Southbend 13lb aluminum flywheel, 4.08's and an NST lightweight crank pulley and the car is VERY responsive but I wouldn't say too responsive. In all honesty, each of the listed mods aren't THAT noticeable by themselves (I did one at a time) but together that make for a nice bump in the cars pep. IMO the flywheel, pulley and gears all compliment each other. if you're doing gears, go with the 4.08's...I doubt you'll feel much of a defference with the 3.90's. Definitely not "too jumpy" when paired with a lightweight flywheel.
Do you have SB clutch as well? How many miles on the flywheel? Any issue?

12nismo 01-21-2015 03:36 PM
Yes, I have the Southbend Stage 2 clutch paired with the flywheel. about 10k miles...no issues whatsoever.

tranceformer 01-21-2015 08:30 PM
Quote:
Originally Posted by Juice14 (Post 3087536)
Old tread, first of all thanks for the info from all you guys.

I know its been a long time since some of you installed the 4.08 gears, but I wanted to ask you about having a lightweight flywheel + 4.08 gears combo.

Does the car feel "too responsive and jumpy" for DD? I want to do the 4.08 gear upgrade but in the future i'll also do the lighter flywheel so maybe 4.08 is not the best option for me, maybe 3.90?

what's your input on this?

thanks ahead of time
At one point I had: JWT 16 lb flywheel, Stillen crank pulley, and 4.08 gears. Not too responsive, just fun to drive. Do it.

370Z JT 01-23-2015 01:47 AM
Looking for info. I have a auto with stock vlsd. Will a g35, g37 manual with stock vlsd differential work with the swap?


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