R32 gts4 sedan differential questions

[vito_96]

Anyone upgraded the front and rear diffs in the GTS4?

Im running (just installed) a os88 box with a built rb26/30 with g35-1050, I am shooting for 800whp  (it's winter here and car is getting some parts installed) but still have the same short GTS4 ratios diffs front (open) and rear (LSD).

I hate when under acceleration car currently has 577whp and 430tq at 22psi (on t04z) the front is all over the road. 

I would like to upgrade the front as I'm planning to run 50/50 with ets-pro. I don't want to blow up a front diff.

Or is there something I can install in the front diff as it's open to make it LSD. 

Not sure exactly what I would need to order or even if I do.

The car is mainly a Street car with some drag days.

 

Thanks for the help 

 

Fyi, I search on this forum for hours and can't find anyone that upgraded a front gts-4 diff... All are gtrs 

Edited December 31, 2023 by vito_96

[robbo_rb180]

so you want recommendation on LSD?
 

Google 
sau.com.au gtr front diff upgrade

[vito_96]

2 hours ago, robbo_rb180 said:

so you want recommendation on LSD?
 

Google 
sau.com.au gtr front diff upgrade

Hey 

 

Ya just looking for an idea of what people are doing with gts-4 front diffs. 

 

Thanks I will take a read on that post 

 

RL 

 

Edited December 31, 2023 by vito_96

[Duncan]

So, the diff is pretty much the same between GTS4 and GTR. The ratio difference is due to the number of teeth on the crown wheel and pinion, and they are commonly swapped between GTR and GTS4.

Assuming you are just looking for a decent LSD, the other variable is the number of splines on the driveshaft that goes into the diff centre; they might be the same GTS4 vs GTR but I'm not sure. From a quick check late 32 and 33 GTR had 31 spline half shafts and they have a 6x1 bolt pattern, not sure if GTS4 is the same.

If it is the same you can use any 32 GTR centre; if not you need a GTS4 specific centre, or you need to change the half shafts and drive shafts as well which might be hard to find

[blind_elk]

I used Stagea diffs (4.08:1) in my R32 GTS4 after I swapped in a RB25DET from a Stagea. Simply swapped CW / pinion onto the R32 centres. Installed a speedo drive from a GT-R to bring the speedo back into line. (Front diff is still open,but then I don't have mind-boggling power - 180aWkw is enough to scare me!)