4.08 Final drive - feedback please

Eclipz · 08-02-2014, 04:37 PM

Is the gear whine because of the brand of gears you used, or 4.08 gears in general? If theres one thing that peevs me its gear whine :shakeshead:

binary0x01 · 08-02-2014, 04:41 PM

Quote:

Originally Posted by tranceformer

I've come full circle now. At about 32k miles I swapped to 4.08 gears. Then just about a month ago at 76k miles, I swapped back to the factory 3.69 gears. For the record I've got a 6MT.

I miss having the 4.08's driving around town. Ripping through 1st, 2nd, and 3rd gear was so fun.

Highway driving is more fun now with the 3.69's. Rolling at 70 then drop it into 3rd and just let it go. Shift to 4th then hold it until .....

Going from 4.08's back to 3.69's makes the car 'feel' slower because it's not revving as quickly.

Why did I swap back to stock gears? Got tired of the gear whine.

I don't have any gear whine. If there is any, it is about 90% less than before the swap. I had a base open diff (peg leg) now with Quaife + 4.08s and redline fluid the noise is almost gone (girlfriend verified). I can actually hear the engine AND the F.I. exhaust now.

L33T Z34 · 08-02-2014, 07:40 PM

Quote:

Originally Posted by Eclipz

Is the gear whine because of the brand of gears you used, or 4.08 gears in general? If theres one thing that peevs me its gear whine :shakeshead:

I'd say over 90% of the time, gear whine is due to bad install. Setting up gears (ring and pinion) ain't to be taken lightly and is a very time consuming process. The 4.08 gears Trance is referring to I assume are the Nissan OEM gears from a Frontier, so they should be good quality, but made in cHina of coarse. Perhaps Trance can elaborate on who installed the final drive. Was it just some tek in a performance shop or an experienced trans/rear end shop that specializes in built trannys/rear ends?

Brad370 · 08-27-2014, 03:08 PM

Here's what to expect based solely on the math. This is a comparison I did for my own Z, which is a 2013 Nismo with Nismo wheels & stock tires (285/35R19). This should give you an idea of what to expect. It will be different for the 7AT.

Morfiy · 08-23-2015, 03:18 PM

Hey guys,

I want to go 4.08 on final gear, got ATS 1,5 way Carbon LSD on 7 AT
Those who did it on 7 AT, could you please advise will MT 4.08 final gear fit ? If not what I have to order (swap)
Thank you

chuckie311 · 08-24-2015, 01:42 PM

you need to order a manual differential from a 370z g37 350z or g35 gears will not fit in the auto housing..i bought mine from ebay

Morfiy · 08-24-2015, 06:01 PM

Quote:

Originally Posted by chuckie311

you need to order a manual differential from a 370z g37 350z or g35 gears will not fit in the auto housing..i bought mine from ebay

Thanks for reply
Should I order complete set with pumkin or just LSD ? Then how its going to happen, I'll swap my LSD inside Manual transmition pumpkin?

chuckie311 · 08-25-2015, 01:54 PM

this is what you order.. it will come with a stock LSD..but when you put the new gears in put the new LSD in at the time.. while you have the pumpkin drop I would also do bushings

03 04 Infi G35 Coupe 2D 6 Speed Brembo Rear Carrier Differential LSD | eBay

chuckie311 · 08-25-2015, 01:57 PM

http://www.myg37.com/forums/engine-d...rs-in-7at.html

Morfiy · 08-25-2015, 06:40 PM

Quote:

Originally Posted by chuckie311

this is what you order.. it will come with a stock LSD..but when you put the new gears in put the new LSD in at the time.. while you have the pumpkin drop I would also do bushings

03 04 Infi G35 Coupe 2D 6 Speed Brembo Rear Carrier Differential LSD | eBay

Thanks again, now its clear

BadChachi · 08-31-2015, 12:44 AM

I have a base. I'm doing it. I'm just waiting on my Quaife 1.5 LSD, ACT Clutch and flywheel, exhaust, HFC's CF 1 piece driveshaft and tune...car would be beast! I hear the 4.08 alone makes your car a beast tho...

chuckie311 · 08-31-2015, 12:01 PM

if you did a dyno before you put your gears in those numbers will change.
with that being said you will notice a huge change in acceleration off the line and the first few gears

Quote:

Originally Posted by BadChachi

I have a base. I'm doing it. I'm just waiting on my Quaife 1.5 LSD, ACT Clutch and flywheel, exhaust, HFC's CF 1 piece driveshaft and tune...car would be beast! I hear the 4.08 alone makes your car a beast tho...

tranceformer · 09-01-2015, 09:23 PM

Quote:

Originally Posted by BadChachi

I have a base. I'm doing it. I'm just waiting on my Quaife 1.5 LSD, ACT Clutch and flywheel, exhaust, HFC's CF 1 piece driveshaft and tune...car would be beast! I hear the 4.08 alone makes your car a beast tho...

I wouldn't say it makes the Z a 'beast'. I'd say it makes the car more responsive, and fun to drive around. Great mod of course.

370pambak · 09-22-2016, 05:27 PM

hey brother I had the 4.08 gears in my car stupid nissan took em off and i still have my 3.69 MT gears was wondering if youd be down to swap since you got a blower and not really need those short gears on a supercharged Z let me know please I live in Cali thanks for the time

08-27-2014, 03:08 PM	#79 (permalink)
Brad370 Base Member Join Date: Aug 2011 Location: online Posts: 102 Drives: car Rep Power: 14	Here's what to expect based solely on the math. This is a comparison I did for my own Z, which is a 2013 Nismo with Nismo wheels & stock tires (285/35R19). This should give you an idea of what to expect. It will be different for the 7AT. Last edited by Brad370; 02-18-2020 at 08:40 AM.

08-24-2015, 01:42 PM	#81 (permalink)
chuckie311 Enthusiast Member Join Date: Jul 2012 Location: las vegas Posts: 313 Drives: Q50/G37 Rep Power: 13	you need to order a manual differential from a 370z g37 350z or g35 gears will not fit in the auto housing..i bought mine from ebay Morfiy likes this. __________________ Tuned by (Seb@Specialty-Z) 2011 G37 Cam'd FBO 347whp 280wtq Corn Fed 4.08 Gears

08-25-2015, 01:54 PM	#83 (permalink)
chuckie311 Enthusiast Member Join Date: Jul 2012 Location: las vegas Posts: 313 Drives: Q50/G37 Rep Power: 13	this is what you order.. it will come with a stock LSD..but when you put the new gears in put the new LSD in at the time.. while you have the pumpkin drop I would also do bushings 03 04 Infi G35 Coupe 2D 6 Speed Brembo Rear Carrier Differential LSD \| eBay Morfiy likes this. __________________ Tuned by (Seb@Specialty-Z) 2011 G37 Cam'd FBO 347whp 280wtq Corn Fed 4.08 Gears Last edited by chuckie311; 08-25-2015 at 05:54 PM.

08-25-2015, 01:57 PM	#84 (permalink)
chuckie311 Enthusiast Member Join Date: Jul 2012 Location: las vegas Posts: 313 Drives: Q50/G37 Rep Power: 13	http://www.myg37.com/forums/engine-d...rs-in-7at.html Morfiy likes this. __________________ Tuned by (Seb@Specialty-Z) 2011 G37 Cam'd FBO 347whp 280wtq Corn Fed 4.08 Gears

09-22-2016, 05:27 PM	#89 (permalink)
370pambak Base Member Join Date: Nov 2013 Location: So cal Posts: 6 Drives: 2012 370z mt 336.5wp Rep Power: 12	4.08 Gears hey brother I had the 4.08 gears in my car stupid nissan took em off and i still have my 3.69 MT gears was wondering if youd be down to swap since you got a blower and not really need those short gears on a supercharged Z let me know please I live in Cali thanks for the time

08-02-2014, 04:37 PM	#76 (permalink)
Eclipz Enthusiast Member Join Date: Dec 2013 Location: Tampa Posts: 360 Drives: 06 Eclipse GS Rep Power: 12	Is the gear whine because of the brand of gears you used, or 4.08 gears in general? If theres one thing that peevs me its gear whine :shakeshead:

08-23-2015, 03:18 PM	#80 (permalink)
Morfiy Base Member Join Date: Dec 2012 Location: Russia Posts: 209 Drives: 370Z "Authentic" Rep Power: 13	Hey guys, I want to go 4.08 on final gear, got ATS 1,5 way Carbon LSD on 7 AT Those who did it on 7 AT, could you please advise will MT 4.08 final gear fit ? If not what I have to order (swap) Thank you

08-31-2015, 12:44 AM	#86 (permalink)
BadChachi Base Member Join Date: Apr 2015 Location: Colorado Age: 34 Posts: 125 Drives: 370z Base Rep Power: 10	I have a base. I'm doing it. I'm just waiting on my Quaife 1.5 LSD, ACT Clutch and flywheel, exhaust, HFC's CF 1 piece driveshaft and tune...car would be beast! I hear the 4.08 alone makes your car a beast tho...

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