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Sunday, October 11, 2020

Nissan Skyline GT-R Differential : Front, Rear, and Middle

R34 Vspec Rear Differential R200  3.545 gear ratio


dif·fer·en·tial

ˌdifəˈren(t)SH(ə)l/

A differential is a gear train with three shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average

The Nissan Skyline GT-R are an all wheel drive car.  They have a front and rear differential, and a transfer case which some people might call a center differential. 

The front differential is called a F160, the rear a R200.  There are two differential gear ratios seen, 4.111 in the R32 and R33 GT-R, and 3.545 in the R34 GT-R.  The Vspec R33, and R34 also had a electronically controlled lockup of the rear differential. The R32 Vspec had a standard differential. 

R200 Gear Ratio Information






Front Differential - F160



Broken front differential/oil pan from an RB26dett engine

The front differential in a R32, R33, and R34 GT-R is part of the engine oil pan. It has the same gear ratio as the rear differential. Make sure of this. If you don't you get cool things happening, like wild bucking when the center diff starts to lockup, and the front wheels are spinning either faster, or slower than the rears.  


Stick your finger in it, to test the level. 



38189-03V00 Seal - Oil, Drive Pinion

Middle - Center Differential or transfercase

The middle or center differential is also called the transfer case. The transfer case splits the power out front to rear.
Nissan Skyline middle differential or transfer case

The ATTESA system controls the middle differential in a Skyline GT-R. A hydraulic pump with input from various sensors, that go to the ATTESA ECU, schedule the amount of lockup of the center differential. 



Center differential chain and clutchpack from a Nissan Skyline GT-R


Rear - R200




The rear differential on a Nissan Skyline GT-R is an R200. Its a strong differential.  They don't fail a lot unless you do things like wheel hop. When they do break, they generally break stub axles. 

From JT
30 vs 31 splines on the stub, aftermarket diffs do require the change, early R32 had the 30 spline vs kouki model had 31 spline. 




R32 GT-R with an R34 Vspec differential added. 

R32 GT-R with a V-spec differential. 






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