So I have a 1990 N/A convertible that has and LSD. This week it stopped locking, and is acting like an open diff. From what I've read there was no N/A LSD offered in 1990. So how can I tell if mine is really a N/A or Turbo II diff? I'd also like to confirm whether my trans is originally out of a N/A or Turbo RX7...

 

well idk if the na and t2 trans have the same differences like with the s4 but the s4 na trans doesnt have a pan the s4 t2 trans has a pan on it

 

My transmission has a pan on it.



Supposedly all Verts came with an open diff, but mine had an LSD till early this week...

 

idk if the s5 na vs t2 had the same difference of a s4 since i have a s4 and i have a s4 t2 trans in my garage and a na on my car so thats how i know the s4 **** and know that difference as for the diff you might wanna check size and s5 did have a lsd but its a vlsd which you cant fix like the s4 lsd

 

I had just read that convertibles regardless of series didn't come stock with LSD. I've never heard of a VLSD going out either... Sure doesn't feel like the VLSD I used to drive (z32)...



The engagement got weaker and weaker over time, almost like a slipping clutch. From the feeling I'd have to assume I have a clutch type. but I dont know if there are any differences I could see without dropping the diff, and pops will kill me if I disassemble my car in his front yard again.



I'm considering just buying a FD diff thats for sale about an hour from my house and putting that in. as long as I have parts to fix it I can drop the diff.

 

If I know what kind of diff I have I can get one welded up for drifting until I can rebuild my current diff.... But it would suck to buy a N/A diff, or a T2 diff and find out its the wrong one...



or if I can confirm exactly what kind of diff I have I can determine if I can put in an FD unit thats for sale near my house.

 

yea there is a size difference in t2 to na and the fd diff will only fit a s4 t2 pumpkin and you could just pop the cover off the diff and see what it looks like if you happen to have a s4 t2 drive train on your s5 then you wont have issues with the fd diff install

 

So I confirmed it still stays locked for the most part on dirt, and last time it rained it still locked. But on dry pavement I have one tire fire...

 

 

I measured 11" stub to stub (width) and 1'2"? from the driveshaft stub, to where the diff bolts together (visible in the pics)