VHR + FD Gear Ratio upgrades - 3.9 and 4.08

Originally Posted by chuckd05 installed 4.08 final drive and the car is AWAKE, it is a blast to drive hard now... Its a pretty darn good mod as far as

		Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain
VHR + FD Gear Ratio upgrades - 3.9 and 4.08

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02-03-2011, 09:22 AM

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Skeeterbop

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Quote:

Originally Posted by chuckd05

installed 4.08 final drive and the car is AWAKE, it is a blast to drive hard now... Its a pretty darn good mod as far as increase in speed and performance go.

But I have a pretty obvious whine from my diff now... I thought this should of been very minimum with the OEM 4.08 final drive. Its pretty loud at 80 and very noticable even crusing as soon as it gets to about 3k RPM... Is this normal ?

I know it is a completely different make/model but my 1993 Lightning came stock with 4.10 gears and it definitely has a whine. I would assume it's a fact of life since it has 50k miles on it and runs perfect.

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