7at 4.08 build

Taylortoons · 01-26-2015, 02:26 PM

OK, so here we go. I am going to upgrade my 7AT gears from nothing to something. This is my second Z (1990 TT 300 PW), and my first with an automatic transmission. I love the car, but something is missing on the bottom end. I only shift with the paddles, so I still get to shift gears at my command, but I rarely get out of 5th gear. This is not a DD, so I'm not worried about gas mileage...

First, this is a pricey mod. So far, here is what I've bought.

-6speed open diff - $500
-Quaife Diff -$1,100
-4.08 gears and rebuild kit - $800
-Whiteline Bushings - $100
-Install - $900
-Uprev tune to turn off wheel speed sensor code- $950

I found a local shop that will rebuild the manual diff, then swap out my base open diff. I will post a log of how the build progresses.

The Quaife should arrive tomorrow and the gears later this week. I have the rebuild scheduled for 2/6. The hope is that I have everything done and back in the car by late February.

nomodsjk · 01-26-2015, 03:43 PM

This is very helpful to me.. Subd

Taylortoons · 01-27-2015, 09:09 AM

Also just bought the automatic companion flange, part number 38210-EC020. Dealer says the manual and automatic have the same companion flange, but I've read other folks on here saying they are different. I can always return it if I don't need it...

nomodsjk · 01-27-2015, 09:34 AM

Cool man keep me posted

Taylortoons · 01-28-2015, 02:47 PM

[attach]408.JPG[/attach]

370z209 · 01-28-2015, 07:51 PM

Nice, was looking to do something similar. Hopefully it turns out great. Subd

Taylortoons · 02-15-2015, 02:39 PM

Update: The shop had to order some extra shims to get the diff and gears into spec. Here is a before vid, not WOT, going through the gears. She is long legged and takes time to get through 4th. Although, she is getting to 60 in about 5 seconds...

Taylortoons · 02-15-2015, 02:41 PM

[https://www.youtube.com/watch?v=PrUlm6SANkY][/YOUTUBE]

mag_black · 02-17-2015, 09:13 PM

Fixed for you.

370Z JT · 02-20-2015, 03:27 PM

I'm getting 4.08 and Quaife fr my auto as well. How do you like it? A worthwhile mod? Did you do whiteline bushings as well? Notice any whine?

Taylortoons · 02-21-2015, 02:38 PM

I bought a used open diff out of a manual car and have a shop doing the work. Right now, they are having a problem with the shims. It may be a couple of more weeks before I get the diffs swapped.

Regarding the Whiteline bushings. I am on the fence about them. I bought a set from Z1, but I am considering sticking with a new set of OEM bushings because of the whine other folks have talked about on here...

Taylortoons · 04-07-2015, 07:55 AM

Got the diff and gears installed yesterday and it took the shop about 5 hours. The bushing on the top of the diff was a beast. That alone took an hour.

First impression is DAMN! She pulls in every gear. For the first time ever, I am now using 7th gear on the freeway. 80 mph is about 3,200 rpm.

Taylortoons · 04-16-2015, 03:27 PM

One mod begats another mod. LOL!

The ECU doesn't like the gears, so the wheel sensors are throwing codes. I called Uprev and they indicated the codes can be removed in a tune. I scheduled an appointment with them in Austin on May 1 for a tune and dyno.

Regarding the Whiteline bushings and noise, it sounds sort of like tires on a 4 wheel drive. It doesn't bother me. But it is there and it's noticeable.

Love the car now, and she will grab a third gear scratch on demand. That is badass!

370Z JT · 04-16-2015, 06:40 PM

Did you lose cruise control?

ta-kid · 04-16-2015, 06:43 PM

Must pull like crazy,but Geeez I have a stock rear and a 7AT and first gear is already pretty low and have to shift to second before I even get across the intersection.You proably could start in Second!

01-26-2015, 02:26 PM	#1 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	7at 4.08 build OK, so here we go. I am going to upgrade my 7AT gears from nothing to something. This is my second Z (1990 TT 300 PW), and my first with an automatic transmission. I love the car, but something is missing on the bottom end. I only shift with the paddles, so I still get to shift gears at my command, but I rarely get out of 5th gear. This is not a DD, so I'm not worried about gas mileage... First, this is a pricey mod. So far, here is what I've bought. -6speed open diff - $500 -Quaife Diff -$1,100 -4.08 gears and rebuild kit - $800 -Whiteline Bushings - $100 -Install - $900 -Uprev tune to turn off wheel speed sensor code- $950 I found a local shop that will rebuild the manual diff, then swap out my base open diff. I will post a log of how the build progresses. The Quaife should arrive tomorrow and the gears later this week. I have the rebuild scheduled for 2/6. The hope is that I have everything done and back in the car by late February. 370z209 and Kris2fer like this. __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev Last edited by Taylortoons; 05-07-2015 at 11:05 AM. Reason: Update Costs

01-27-2015, 09:09 AM	#3 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	Also just bought the automatic companion flange, part number 38210-EC020. Dealer says the manual and automatic have the same companion flange, but I've read other folks on here saying they are different. I can always return it if I don't need it... __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev

01-28-2015, 07:51 PM	#6 (permalink)
370z209 Base Member Join Date: May 2014 Location: Bay Area Posts: 114 Drives: 2015 S4, 2015 A3 Rep Power: 10	Nice, was looking to do something similar. Hopefully it turns out great. Subd __________________ MEISTERSCHAFT \| SWIFT \| SPL \| WORK\| NISMO \| PROJECT KICS\| AEROJACKET Soon to be for sale: - Muteki 32901N Neon Chrome SR48 Open End and Locking Lug Nuts - Forgestar F14 19" 19x9 ET=21 Semi Concave 19x11 ET=24 Deep Concave

02-15-2015, 02:39 PM	#7 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	Update: The shop had to order some extra shims to get the diff and gears into spec. Here is a before vid, not WOT, going through the gears. She is long legged and takes time to get through 4th. Although, she is getting to 60 in about 5 seconds... __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev Last edited by Taylortoons; 02-15-2015 at 02:43 PM.

02-15-2015, 02:41 PM	#8 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	[https://www.youtube.com/watch?v=PrUlm6SANkY][/YOUTUBE] __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev

01-26-2015, 03:43 PM	#2 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19961	This is very helpful to me.. Subd

01-27-2015, 09:34 AM	#4 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19961	Cool man keep me posted

02-17-2015, 09:13 PM	#9 (permalink)
mag_black A True Z Fanatic Join Date: Mar 2013 Location: Massachusetts Posts: 1,400 Drives: 09 370Z MT6 Rep Power: 666	Fixed for you. __________________ fujimura ≠ abbeyRoadCompany ≠ fastIntentions ≠ motordyne ≠ avantGarde ≠ ecutek ≠ nismo ≠ stillen ≠ stoptech ≠ gtm ≠ spl ≠ carbonfiberelement ≠ stance™

02-20-2015, 03:27 PM	#10 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 378	I'm getting 4.08 and Quaife fr my auto as well. How do you like it? A worthwhile mod? Did you do whiteline bushings as well? Notice any whine? __________________ 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

02-21-2015, 02:38 PM	#11 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	I bought a used open diff out of a manual car and have a shop doing the work. Right now, they are having a problem with the shims. It may be a couple of more weeks before I get the diffs swapped. Regarding the Whiteline bushings. I am on the fence about them. I bought a set from Z1, but I am considering sticking with a new set of OEM bushings because of the whine other folks have talked about on here... __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev

04-07-2015, 07:55 AM	#12 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	Got the diff and gears installed yesterday and it took the shop about 5 hours. The bushing on the top of the diff was a beast. That alone took an hour. First impression is DAMN! She pulls in every gear. For the first time ever, I am now using 7th gear on the freeway. 80 mph is about 3,200 rpm. __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev

04-16-2015, 03:27 PM	#13 (permalink)
Taylortoons Base Member Join Date: Aug 2013 Location: Dallas Posts: 98 Drives: 11 370Z AT PW Rep Power: 11	One mod begats another mod. LOL! The ECU doesn't like the gears, so the wheel sensors are throwing codes. I called Uprev and they indicated the codes can be removed in a tune. I scheduled an appointment with them in Austin on May 1 for a tune and dyno. Regarding the Whiteline bushings and noise, it sounds sort of like tires on a 4 wheel drive. It doesn't bother me. But it is there and it's noticeable. Love the car now, and she will grab a third gear scratch on demand. That is badass! Memphis370Z likes this. __________________ Top Speed CF Intake, FI Non Res TP, Nismo Exhaust, ONEighty LED, JDM Rear Fog, Kranze II, Michelin Pilot SS, Quaife LSD, 4.08, Whiteline, UpRev

04-16-2015, 06:40 PM	#14 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 378	Did you lose cruise control? __________________ 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

04-16-2015, 06:43 PM	#15 (permalink)
ta-kid Base Member Join Date: Feb 2015 Location: Maple Ridge BC canada Posts: 51 Drives: Kia soul, 370Z vert Rep Power: 10	Must pull like crazy,but Geeez I have a stock rear and a 7AT and first gear is already pretty low and have to shift to second before I even get across the intersection.You proably could start in Second!

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