Change Diff Or Strengthen It

[4drlvr]

Hi People,

As the topic states, Im looking at strengthing my diff to handle the conversion of the rb26 in it. Now the car previously was a rb25dett auto which is now a rb26dett with an r34gtt gearbox in it.

What i want to know is it worth taking it to a diff place and strengthing it or buying a new one.

Also what diff do i have in it if the car from factory was a R33 gtst 1996 s1.5 4door auto no hicas with abs(if that made a difference).

Also does anyone know good diff places in melbourne nothern suburbs such as epping,cambellfield, somerton, tullamarine, etc if people are recommending strengthing the diff???

Any help will be good.

Ray

[4drlvr]

Anyone!!!!

[_Wing_]

Not sure what you mean by "strengthening" it? They're all R200 and GTR's have thicker shafts.

[Ryno]

I wouldn't be worried about breaking the diff, they're bloody tough, so you'll usually break something else before that goes.

Your question should be: will my viscous LSD centre be able to put the power down to the ground?

You won't know that until you go for your first drive, and see if it spins both wheels off the line.

[4drlvr]

Hi Fellas, thanks for the reply.

Both wheels spin most of the time but ive noticed a weird knock that comes in sometimes after a bit of trashing which disappears after a bit of easy driving. I have changed the oils so what would be the best way to go, kazz lsd 2 way or should i just get this diff fixed??? and if to get it fixed anyone got any recommendation on a diff shop????

[Ryno]

I wouldn't waste any money on the standard VLSD, and an aftermarket 2 way is usually a fair amount of coin, unless you find one second hand.

A couple of better value options are:

The R32 GTR diff. It's a mechanical (clutch type) that is a good upgrade, but you will need to find someone wrecking a GTR, because you will also need the half shafts and rear hubs (as they are a larger diameter, and your half shafts wont bolt up).

The S15 Helical LSD, out of the manual turbo. It's a mechanical Helical centre, that has awesome reviews from everyone that uses one. As they are helical, they do not wear out like "clutch types" so it's a safer bet when buying second hand. They run 6 bolt half shafts, so you will need to get them as well to make it bolt up, but you won't need to replace the rear hubs (like when upgrading to the R32 GTR diff).

I have just purchased an S15 rear diff (with half shafts) for $250, so it's a pretty cost effective upgrade. It also comes with a 3.7:1 ratio, so if you stick with that it will effectively make your gears all 10% taller. I'm going to try it with that, and see how it goes (as I find first gear too short in my car, and am also looking forward to saving some fuel by cruising at lower revs in 5th). But worst case, if I don't like it I can swap the crown wheel and pinion from my old diff back into it, and run the old 4.1:1 ratio.

Edited January 21, 2010 by Ryno