4.08 Gear Install (7AT) Review

Mr&Mrs · 02-05-2013, 10:01 AM

Nice review I had not found this before + Rep

Ivoidwarranty · 03-05-2013, 01:38 PM

The input shaft is different from the autos to the manuals on G37's. Is this the same for the 370Z's?

The autos use a three fingered flange while the manuals use a round flange with four bolt holes.

Red_Z · 03-06-2013, 11:30 AM

having a hard time finding a 370 6MT pumpkins. Will one from early 04 G35C 6 MT works? or one from 350Z?

Ivoidwarranty · 04-17-2013, 11:26 AM

The cruise control issue has to do with the logic. For automatics, the cruise control logic looks at both the transmission output speed and wheel speed. If they are inconsistent with one another the logic throws a code and the cruise control will not work. For the manuals, the cruise control logic does not look at the transmission output speed.

Wabbyyy · 04-17-2013, 11:28 PM

Top speed isn't 200 anyways, nor 180. 165 mph

Wonka2581 · 04-18-2013, 12:00 AM

Just to be clear on this guy.... I have a 7AT and just got a LSD out of a 6MT Sport. Do I still need to get a new pumpkin or can I use my stock one????

chrischhorn · 04-18-2013, 04:21 AM

you can use your pumpkin as long as you swap everything all at once. I assume it is just a VLSD diff? if so and you did not have VLSD before, you will need new stub shafts.

Wonka2581 · 04-18-2013, 04:56 AM

Quote:

Originally Posted by chrischhorn

you can use your pumpkin as long as you swap everything all at once. I assume it is just a VLSD diff? if so and you did not have VLSD before, you will need new stub shafts.

It came with a (half shaft) is that what your talking about?

NickD · 05-14-2013, 01:50 PM

So I have a 7AT and did Differentials and Gears. I just got the car tuned by Visconti using EcuTek and he figured out how to get cruise control back!

Z eliminator · 05-14-2013, 03:11 PM

When you drive the 7AT with the 4.08 gears. does the car bog a little during the gear changes after it changes gears ?
let me know , as i think that mine is closing the trottle bodies as it changes gears.
Its driving me nuts .

Z

Wabbyyy · 05-14-2013, 03:37 PM

Top speed isn't 200mph. Its 165. Its governed at 165 mph

visconti · 05-14-2013, 03:47 PM

Quote:

Originally Posted by dthem370

Hey Guys, when I was doing research on getting 4.08s for the 7AT 370Z I noticed there was a lot of people asking questions that were not getting answered. I'm going to give you guys some information I read up on and also my review after getting my gears installed yesterday.

Informational:

-The 7AT will lose cruise control. The light will just flash when you try turning it on.

-The RPM increase is around 600-700. See Videos of before and after posted below.

-Due to the RPM increase, there will be a decrease in highway MPG, but you can possible see an increase in MPG in city driving since it takes less work for the engine to get to the speed limit. Personally, I didn't notice a difference at all.

-For the 7AT you will need the differential from a manual 370Z to install the 4.08s.

-You can use the stock VLSD or an aftermarket one.

-The top speed will decrease from something like 200MPH to 180MPH. Realistically I doubt any of us will ever go that fast.

-Acceleration increases throughout all the gears and you will notice a loss in traction especially in 1st gear. Throw some good tires on there and you should be fine.

-Down Shift Rev Matching seems to be unaffected and seems to be working fine. I will drive it more in sport more within the next couple days and update if I notice anything different.

-The car is much more fun to drive now!!!

My Review:

I first want to start out by thanking Seb at SpecialtyZ for doing my install. He always does great work and answers all my questions. This is the only place I trust to take my Z. This time he did the gear install and GTM transmission cooler for me. Everything so far is working flawlessly!!!

After driving the car, you will instantly feel the difference. The car feels much faster and torquier. First gear is really short and 2nd and 3rd gear feel like your in a rocket. The fun factor is really where it's all at. The car accelerates so much faster throughout the entire RPM range, that its just a blast to smash the pedal and go.

Parts installed:
1. 4.08 gears
2. Gear install kit (Seals, bearings, shims, crush collar, etc)
3. Redline gear oil
4. Manual differential w/ stock VLSD

Seb swapped out the 3.69s from the manual diff and installed the 4.08s. Then swapped out my entire stock differential with the manual one.

Stock Gears 70MPH

Stock Gears 80MPH

4.08 Gears 70MPH

4.08 Gears 80MPH

We can fix the cruise control issue with a EcuTek flash

NickD · 05-14-2013, 05:16 PM

Quote:

Originally Posted by Z eliminator

When you drive the 7AT with the 4.08 gears. does the car bog a little during the gear changes after it changes gears ?
let me know , as i think that mine is closing the trottle bodies as it changes gears.
Its driving me nuts .

Z

Doesn't feel like it. Are you referring to shifting up or down?

Z eliminator · 05-14-2013, 08:24 PM

up shifting with the paddle shifters

NickD · 05-14-2013, 09:26 PM

No. In fact my car feels like it shifts faster now. Are you tuned?

02-05-2013, 10:01 AM	#31 (permalink)
Mr&Mrs A True Z Fanatic Join Date: May 2010 Location: Tampa Posts: 4,207 Drives: RZ34 Rep Power: 31940	Nice review I had not found this before + Rep __________________ Project Z <--Click - Check out the link too many mods to list!

04-17-2013, 11:28 PM	#35 (permalink)
Wabbyyy Base Member Join Date: Feb 2013 Location: New Jersey Age: 31 Posts: 126 Drives: 2009 370z Rep Power: 12	Top speed isn't 200 anyways, nor 180. 165 mph __________________ 2009 370z.

04-18-2013, 12:00 AM	#36 (permalink)
Wonka2581 A True Z Fanatic Join Date: Nov 2012 Location: Chattanooga, TN Posts: 3,083 Drives: MY WIFE CRAZY.... Rep Power: 2612	Just to be clear on this guy.... I have a 7AT and just got a LSD out of a 6MT Sport. Do I still need to get a new pumpkin or can I use my stock one???? __________________ "I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

04-18-2013, 04:21 AM	#37 (permalink)
chrischhorn A True Z Fanatic Join Date: Jan 2012 Location: Mililani, HI Posts: 1,566 Drives: 2014 Juke Nismo RS Rep Power: 16	you can use your pumpkin as long as you swap everything all at once. I assume it is just a VLSD diff? if so and you did not have VLSD before, you will need new stub shafts. __________________ R.I.P. 8/01/13 1SlowZ One day I'll have another....

05-14-2013, 01:50 PM	#39 (permalink)
NickD A True Z Fanatic Join Date: Mar 2012 Location: Babylon, NY Posts: 1,321 Drives: 10 Z34 Touring Vert Rep Power: 15	So I have a 7AT and did Differentials and Gears. I just got the car tuned by Visconti using EcuTek and he figured out how to get cruise control back! SterlingDrive likes this. __________________ 2010 370z Touring Roadster Monterey Blue My Z Photo Library

03-06-2013, 11:30 AM	#33 (permalink)
Red_Z Enthusiast Member Join Date: May 2012 Location: California Posts: 332 Drives: A red Z Rep Power: 15	having a hard time finding a 370 6MT pumpkins. Will one from early 04 G35C 6 MT works? or one from 350Z?

04-17-2013, 11:26 AM	#34 (permalink)
Ivoidwarranty Base Member Join Date: Nov 2009 Location: Nebraska Posts: 59 Drives: 08 G37S Rep Power: 16	The cruise control issue has to do with the logic. For automatics, the cruise control logic looks at both the transmission output speed and wheel speed. If they are inconsistent with one another the logic throws a code and the cruise control will not work. For the manuals, the cruise control logic does not look at the transmission output speed.

05-14-2013, 03:11 PM	#40 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	When you drive the 7AT with the 4.08 gears. does the car bog a little during the gear changes after it changes gears ? let me know , as i think that mine is closing the trottle bodies as it changes gears. Its driving me nuts . Z __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

05-14-2013, 03:37 PM	#41 (permalink)
Wabbyyy Base Member Join Date: Feb 2013 Location: New Jersey Age: 31 Posts: 126 Drives: 2009 370z Rep Power: 12	Top speed isn't 200mph. Its 165. Its governed at 165 mph __________________ 2009 370z.

05-14-2013, 08:24 PM	#44 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	up shifting with the paddle shifters __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

05-14-2013, 09:26 PM	#45 (permalink)
NickD A True Z Fanatic Join Date: Mar 2012 Location: Babylon, NY Posts: 1,321 Drives: 10 Z34 Touring Vert Rep Power: 15	No. In fact my car feels like it shifts faster now. Are you tuned? __________________ 2010 370z Touring Roadster Monterey Blue My Z Photo Library

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