Differentials

[stewartmotorsport]

Are there differences between diffs for an NA and a TT?

I want to upgrade my diff to a VLSD and I found one at the right price for a TT. They look the same (at least in pictures) so I wanna make sure before I purchase it.

[vulcanrush]

yes, there are differences between an na and a tt differential.
r200 versus r230? the tt (r230 is bigger) half-shafts have a different bolt pattern?

[stewartmotorsport]

what does r200 and r230 mean? I have never heard those terms.

Are the bolt patterns different?

Are the axle lengths different?

Are the mounts for the driveshaft different?

[vulcanrush]

what does r200 and r230 mean? I have never heard those terms.

Are the bolt patterns different?

Are the axle lengths different?

Are the mounts for the driveshaft different?

the r200 is the na diff, the r230 is the tt diff.
the mounts for the ds are different, please someone correct me if i'm wrong.

[a.p.barron]

There are differences as vulcanrush already pointed out. Just curious though, why would you want to swap the lower-geared R230 into an z32 NA (R200)? I'm pretty sure the NA has a 4.08-geared VLSD, which works pretty well. I've heard of TT owners switching out the R230 to the R200 because of the higher gears, but never vice versa.

[stewartmotorsport]

You misunderstand. I do not have a VLSD unit now - just a peg leg. I found a VLSD with super low miles and it is priced right - but it is for a TT. But before I buy anything, I ask people who know, if I don't know the answers myself.

So the answer is: don't buy it, and look for one from a NA car.

[a.p.barron]

Oh ok. Well, from what I understand, the R230 has a 6-bolt pattern going to each axle, so you would most likely have to get new axles, since the R200 is 5-bolt. The input shaft on the R230 has a 6 bolt input shaft, so you would have to get a TT driveshaft, and I believe the mounting points are different on the TT, so you would have to get the TT subframe as well.

Your conclusion is correct. The easiest thing to do would be to buy a used NA diff. Also, before you buy the diff make sure you it's smooth when you spin everything.

How do you have a peg leg on your NA? It's supposed to be VLSD.

[marty1mc]

To run the TT Rear end requires more than just axles. You will need the subframe, hubs, axles, driveshaft. It is completely different.

But, don't lose hope. You can also use the rear out of a 97-01 Q45. It is almost exactly the same. Swap over the input shaft and the rear cover and it bolts right in...

[vulcanrush]

Just curious though, why would you want to swap the lower-geared R230 into an z32 NA (R200)?I've heard of TT owners switching out the R230 to the R200 because of the higher gears, but never vice versa.

a lot of people switch back to the tt differentials, they hold a lot more power, na differentials snap after a certain power point.

[ArticDragon192]

TT and NA diffs, internally and externally are completely different. NA has a 200mm ring gear, TT has a 230mm ring gear, hence the R200 and R230 names. TT VLSD has more splines internally than an NA. So NA output shafts will absolutely not work on a TT VLSD.
Also, TT output shafts will not work in an NA housing. The diameter of where the oiling grooves are at are much larger, and do not allow the whole outputshaft to enter the NA differential. TT output shafts are also 6x1 bolt pattern, whereas the NA has a bolt pattern of 5x1.
You're going to need to find the internals of another NA VLSD in order to get rid of the pegleg.