4.08 Gear Install (7AT) Review

blueranger · 05-29-2014, 11:18 PM

Quote:

Originally Posted by Taylortoons

Thinking about going this route. Just to make sure I'm reading the posts correctly. I have a base 2011 7AT with open diff. The Quaife lsd and 4.08 will drop into the pumpkin and require only shims?

Save time and money... Just swap your rear diff for a manual vlsd pumpkin and buy the Z1 diff swap kit that gives you the Nismo finned cover, motul oil & Whiteline bushings. Just swapped and the 3.69 gears with VLSD feels great on my 7AT!

1slow370 · 05-30-2014, 03:07 AM

Quote:

Originally Posted by blueranger

Save time and money... Just swap your rear diff for a manual vlsd pumpkin and buy the Z1 diff swap kit that gives you the Nismo finned cover, motul oil & Whiteline bushings. Just swapped and the 3.69 gears with VLSD feels great on my 7AT!

this^ it literally takes me 3 hours on jackstands including the rear bushing removal

DEpointfive0 · 05-30-2014, 03:12 AM

Quote:

Originally Posted by 1slow370

this^ it literally takes me 3 hours on jackstands including the rear bushing removal

I might have witnessed this.

1slow370 · 05-30-2014, 03:20 AM

Quote:

Originally Posted by DEpointfive0

I might have witnessed this.

LOL at "might have" on a side note I was upset that you got your rear rotors changed before I got your diff instaled, but I account that to showing you the wrench trick so I still win

wstar · 05-29-2014, 07:46 PM

^ Very true. My only experience with rear ends was on an IH Scout a friend was working on several years ago. We decided to buy new gears and put them in ourselves. Keep in mind this is a big, ancient SUV/Truck type thing where everything is easy to work on.

The first full day with 3 guys on the project (none of us had done this kind of thing before, but we're all very experienced at any normal DIY mechanic stuff short of engine/diff/trans rebuilds, and we had a 2-post lift to work on) was a complete mess just learning what was going on during re-assembly, and realizing we didn't have enough of the correct shims, and that we had already crushed the crush bushing/washer thing for the pinion down flatter than it should be, etc, and that the one cheap dial gauge we had wasn't nearly enough in terms of taking repeatable measurements of the right kinds.

After ordering more bits and tools, we went back at it again for a full weekend (well, minus time spent drinking between) trying to get the thing reinstalled correctly. It was a long repetitive process of putting it in, seeing a problem with measurements and/or the grease pattern on the gears, pulling it back out and adjusting some shims, trying again and get wildly different results than we expected from the shim adjustments, etc.

Eventually we did make it work, but 3 guys x 3 days was totally not worth it vs just taking it down to a gear shop that does this stuff every day and paying them to do it right. Shortly after that I had to do a similar job on my '99 Trans Am. Dropped it off at a shop that specializes in diff/trans work and they had it back to me the next day working perfect for something like $500.

I'm all for encouraging people to take on DIY projects and do things themselves, because it's usually worth the learning process, but... if you're ready to tackle a diff install, you'd know it, and if you don't know it, don't bother

DjSquall · 05-30-2014, 05:38 AM

I have a 7AT into which I just swapped in the quaife diff in place of the factory VLSD. does anyone know if I can fit the 4.08 gears on it?

NickD · 05-30-2014, 08:43 AM

Quote:

Originally Posted by DjSquall

I have a 7AT into which I just swapped in the quaife diff in place of the factory VLSD. does anyone know if I can fit the 4.08 gears on it?

Did you see my post a few back? lol I did the same thing already.

NickD · 05-30-2014, 08:45 AM

IMPORTANT NOTE FOR 7AT GEAR SWAP WITH QUAIFE DIFFS

YOU NEED TO GET THE QUAIFE DIFF FOR A MANUAL TRANSMISSION OR YOU WILL NOT BE ABLE TO INSTALL THE 4.08 GEAR.

THE QUAIFE DIFF FOR AUTOMATIC TRANSMISSION WILL NOT WORK WITH 4.08s

1slow370 · 05-30-2014, 01:32 PM

you will want to get a quaife for a manual , base car and whatever gear set you choose (except 3.333) and then you can use your 7at non-sport case and stub shafts with a lot of shimming at that point i would take it to a shop and let them buy everything else you will need

binary0x01 · 06-19-2014, 02:23 PM

Review:

The Quaife diff + 4.08 gears with whiteline bushings and redline gear oil = awesome

L33T Z34 · 08-02-2014, 08:13 PM

I've got a 38301-EH53D for sale.

370Z JT · 02-11-2015, 01:43 AM

I have a 09 370Z auto with VLSD. I want to have 4.08 final with an aftermarket LSD.

Do I need to purchase a manual non-VLSD pumpkin from a base model or a manual VLSD pumpkin from sport package to make this work?

G37Sam · 02-11-2015, 11:24 AM

Both will work, I'd get the Sport just to be safe. If you get non sport you'll need to order the aftermarket LSD with stub axles I believe. Someone correct me if I'm wrong please.

jchammond · 03-22-2015, 06:47 PM

your fuel milage is terrible! i get 25+ with my 370/7at & drive aggressive at times.

robway · 04-04-2017, 09:31 PM

i may be reviving dead thread, but some of the terms used in these kind of threads are unclear to me. when people talk about swapping pumpkins(differentials?)are they simply referring to carrier assembly, or are there other parts necessary? can i simply swap my base auto carrier with the mt vlsd carrier and then install the gears

05-29-2014, 07:46 PM	#5 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	^ Very true. My only experience with rear ends was on an IH Scout a friend was working on several years ago. We decided to buy new gears and put them in ourselves. Keep in mind this is a big, ancient SUV/Truck type thing where everything is easy to work on. The first full day with 3 guys on the project (none of us had done this kind of thing before, but we're all very experienced at any normal DIY mechanic stuff short of engine/diff/trans rebuilds, and we had a 2-post lift to work on) was a complete mess just learning what was going on during re-assembly, and realizing we didn't have enough of the correct shims, and that we had already crushed the crush bushing/washer thing for the pinion down flatter than it should be, etc, and that the one cheap dial gauge we had wasn't nearly enough in terms of taking repeatable measurements of the right kinds. After ordering more bits and tools, we went back at it again for a full weekend (well, minus time spent drinking between) trying to get the thing reinstalled correctly. It was a long repetitive process of putting it in, seeing a problem with measurements and/or the grease pattern on the gears, pulling it back out and adjusting some shims, trying again and get wildly different results than we expected from the shim adjustments, etc. Eventually we did make it work, but 3 guys x 3 days was totally not worth it vs just taking it down to a gear shop that does this stuff every day and paying them to do it right. Shortly after that I had to do a similar job on my '99 Trans Am. Dropped it off at a shop that specializes in diff/trans work and they had it back to me the next day working perfect for something like $500. I'm all for encouraging people to take on DIY projects and do things themselves, because it's usually worth the learning process, but... if you're ready to tackle a diff install, you'd know it, and if you don't know it, don't bother Felix 808 likes this. __________________ 7AT Track Car! Journal thread / Car setup details

05-30-2014, 05:38 AM	#6 (permalink)
DjSquall A True Z Fanatic Join Date: Apr 2010 Location: Tottenham, ON Age: 37 Posts: 1,340 Drives: My first car Rep Power: 23	I have a 7AT into which I just swapped in the quaife diff in place of the factory VLSD. does anyone know if I can fit the 4.08 gears on it? __________________ My Z did p0rn

05-30-2014, 08:45 AM	#8 (permalink)
NickD A True Z Fanatic Join Date: Mar 2012 Location: Babylon, NY Posts: 1,321 Drives: 10 Z34 Touring Vert Rep Power: 16	*IMPORTANT NOTE FOR 7AT GEAR SWAP WITH QUAIFE DIFFS* YOU NEED TO GET THE QUAIFE DIFF FOR A MANUAL TRANSMISSION OR YOU WILL NOT BE ABLE TO INSTALL THE 4.08 GEAR. THE QUAIFE DIFF FOR AUTOMATIC TRANSMISSION WILL NOT WORK WITH 4.08s __________________ 2010 370z Touring Roadster Monterey Blue My Z Photo Library

05-30-2014, 01:32 PM	#9 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7252	you will want to get a quaife for a manual , base car and whatever gear set you choose (except 3.333) and then you can use your 7at non-sport case and stub shafts with a lot of shimming at that point i would take it to a shop and let them buy everything else you will need __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

06-19-2014, 02:23 PM	#10 (permalink)
binary0x01 Track Member Join Date: Jun 2012 Location: Idaho Posts: 892 Drives: 2012 6-SPEED 3.7L Z Rep Power: 15	Review: The Quaife diff + 4.08 gears with whiteline bushings and redline gear oil = awesome __________________ Tune (by Seb@SpecialtyZ) -- Upgraded Parts List : When in doubt, use brute force; if it doesn't work, you aren't using enough.

08-02-2014, 08:13 PM	#11 (permalink)
L33T Z34 Banned Join Date: Jun 2010 Location: Ahnald, MO Age: 47 Posts: 387 Drives: 09 K51 G C Bw/S 6MT Rep Power: 0	I've got a 38301-EH53D for sale.

02-11-2015, 01:43 AM	#12 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 379	I have a 09 370Z auto with VLSD. I want to have 4.08 final with an aftermarket LSD. Do I need to purchase a manual non-VLSD pumpkin from a base model or a manual VLSD pumpkin from sport package to make this work? __________________ Click for My Journal Top Secret \| EVO-R \| Fujimura Auto \| Shine Auto \| Seibon \| MRWorks \| Swift \| SPC \| SSR \| UpRev \| Project Kics \| NST \| Titek \| Eibach \| Nismo \| Whiteline \| Quaife \| Invidia \| Fly1 \| CF Element \| Carbon Signal

02-11-2015, 11:24 AM	#13 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 21	Both will work, I'd get the Sport just to be safe. If you get non sport you'll need to order the aftermarket LSD with stub axles I believe. Someone correct me if I'm wrong please. __________________ '14 Viper GTS '08 RB'd G37S - Sold

03-22-2015, 06:47 PM	#14 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	your fuel milage is terrible! i get 25+ with my 370/7at & drive aggressive at times.

04-04-2017, 09:31 PM	#15 (permalink)
robway Base Member Join Date: Aug 2016 Location: Little Rock Posts: 2 Drives: 2012 370z Touring AT Rep Power: 10	i may be reviving dead thread, but some of the terms used in these kind of threads are unclear to me. when people talk about swapping pumpkins(differentials?)are they simply referring to carrier assembly, or are there other parts necessary? can i simply swap my base auto carrier with the mt vlsd carrier and then install the gears

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