4.08 Frontier gear swap

jnaut · 05-09-2010, 09:43 AM

i dont think it will be the flywheel or pulley causing the srm to be off , it will be the gears i will be a higher rpm than stock, if were are at the same mph.

as for dd use, i see no problem, as long as you dont cruise at high rate of speed for hours on ends since there is and rpm increase.

and on another note i cant wait for my full exhaust, the car is really coming together a lot better acceleration, tranceformer and i went on an empty hyw,(i had my g.f. in my car)it was noticeably different, it is a good test as his is100% stock.

Zsteve · 05-09-2010, 09:53 AM

Quote:

Originally Posted by jnaut

i dont think it will be the flywheel or pulley causing the srm to be off , it will be the gears i will be a higher rpm than stock, if were are at the same mph.

as for dd use, i see no problem, as long as you dont cruise at high rate of speed for hours on ends since there is and rpm increase.

and on another note i cant wait for my full exhaust, the car is really coming together a lot better acceleration, tranceformer and i went on an empty hyw,(i had my g.f. in my car)it was noticeably different, it is a good test as his is100% stock.

Cool, right now Im kinda stuck between the gears and lad or SC and maybe LSD. Gotta see the price diff between the two.

CBRich · 05-09-2010, 09:56 AM

Quote:

Originally Posted by Zsteve

Cool, right now Im kinda stuck between the gears and lad or SC and maybe LSD. Gotta see the price diff between the two.

The gears are much cheaper than the supercharger but won't give you nearly as big a difference. These are two totally different categories of modification.

Zsteve · 05-09-2010, 10:01 AM

Quote:

Originally Posted by CBRich

The gears are much cheaper than the supercharger but won't give you nearly as big a difference. These are two totally different categories of modification.

Yea its all about the money, I am leaning heavily on the SC side tho, just waiting for a few to get it and see how it does and to find a shop I can trust on the install. Buut if SC is a no go then the gears are my next mod.

So with the AT what is different about the diff that makes me have to get a whole new pumpkin? And is it a auto or manual pumpkin from the 350Z Id have to get?

So parts are as this? new pumpkin, gears, LSD, and some kind of rods?

jnaut · 05-09-2010, 10:28 AM

Quote:

Originally Posted by Zsteve

Yea its all about the money, I am leaning heavily on the SC side tho, just waiting for a few to get it and see how it does and to find a shop I can trust on the install. Buut if SC is a no go then the gears are my next mod.

So with the AT what is different about the diff that makes me have to get a whole new pumpkin? And is it a auto or manual pumpkin from the 350Z Id have to get?

So parts are as this? new pumpkin, gears, LSD, and some kind of rods?

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

SE · 05-09-2010, 06:07 PM

Intersting. I might wait for a SRM fix before I attempt this though.

jnaut · 05-09-2010, 06:18 PM

Quote:

Originally Posted by weeeee

Intersting. I might wait for a SRM fix before I attempt this though.

my srm works

SE · 05-09-2010, 06:26 PM

Didn't you say it was off by a few hundred RPM? Or is that fixed now?

jnaut · 05-10-2010, 05:48 PM

yes its off by a few hundred rpm,most of the time i dont even notice.

1slow370 · 05-11-2010, 05:26 AM

Quote:

Originally Posted by tranceformer

one other thing, I have a SPL diff bushing set from when I had my 350Z, never got around to installing it or even selling it. Kuah@SPL assured me that the front bushings would fit and the rear would stick out a little bit since the 350Z rear subframe is a little bit thicker. Last night, we checked it while we had the diff out. Everything looks good, I think I may end up keeping the diff bushings for my Z.

did you install the aluminum bushings? was there any increase in noise after the install?

tranceformer · 05-11-2010, 06:28 AM

Quote:

Originally Posted by 1slow370

did you install the aluminum bushings? was there any increase in noise after the install?

nope, didn't install them, just mocking them up to see if they would fit. i'll probably end up installing them on my Z.

jnaut · 05-12-2010, 02:21 PM

If you have an open rean and want put install a stock lsd, you will need a passenger side stub shaft from an lsd car, weather it be auto or stick doent matter. If you are and auto lsd/open you will need a carrier from a manual car, not the entire diff. also the ratio for auto is 3.3 and the manual is 3.6 so if you dont want to go a radical as 4.08 just swap a stock manual rear end/gears.

Solus · 11-09-2010, 12:15 PM

I am digging up threads from the grave because I can't find the one I am looking for. Any idea how much loss in top speed a manual 370z would have when switching to 4.08's?

jnaut · 11-09-2010, 12:28 PM

without a tune you will lose none, i have gone to an indicated 167mph with my 4.08 gears.

Solus · 11-09-2010, 12:35 PM

Do you know off hand what kind of RPM increase you saw at highway speeds? say 70-80 mph?

05-09-2010, 09:43 AM	#46 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	i dont think it will be the flywheel or pulley causing the srm to be off , it will be the gears i will be a higher rpm than stock, if were are at the same mph. as for dd use, i see no problem, as long as you dont cruise at high rate of speed for hours on ends since there is and rpm increase. and on another note i cant wait for my full exhaust, the car is really coming together a lot better acceleration, tranceformer and i went on an empty hyw,(i had my g.f. in my car)it was noticeably different, it is a good test as his is100% stock. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

05-10-2010, 05:48 PM	#54 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	yes its off by a few hundred rpm,most of the time i dont even notice. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

05-12-2010, 02:21 PM	#57 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	If you have an open rean and want put install a stock lsd, you will need a passenger side stub shaft from an lsd car, weather it be auto or stick doent matter. If you are and auto lsd/open you will need a carrier from a manual car, not the entire diff. also the ratio for auto is 3.3 and the manual is 3.6 so if you dont want to go a radical as 4.08 just swap a stock manual rear end/gears. Roca_PR likes this. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

11-09-2010, 12:28 PM	#59 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	without a tune you will lose none, i have gone to an indicated 167mph with my 4.08 gears. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

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05-09-2010, 06:07 PM	#51 (permalink)
SE A True Z Fanatic Join Date: Jan 2010 Location: San Jose, CA Posts: 4,236 Drives: 370z/STI/EVO X/IS-F Rep Power: 23	Intersting. I might wait for a SRM fix before I attempt this though.

05-09-2010, 06:26 PM	#53 (permalink)
SE A True Z Fanatic Join Date: Jan 2010 Location: San Jose, CA Posts: 4,236 Drives: 370z/STI/EVO X/IS-F Rep Power: 23	Didn't you say it was off by a few hundred RPM? Or is that fixed now?

11-09-2010, 12:15 PM	#58 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 16	I am digging up threads from the grave because I can't find the one I am looking for. Any idea how much loss in top speed a manual 370z would have when switching to 4.08's?

11-09-2010, 12:35 PM	#60 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 16	Do you know off hand what kind of RPM increase you saw at highway speeds? say 70-80 mph?