I just did a 5 speed swap on my S5 vert. I want to swap the diff in the car. What year and model should I get a diff from? Thanks

 

87-88 T2 diff's....mechanical baby!

 

Aren't they viscous?

 

It depends on what tranny you installed, if you installed an N/a tranny, find an N/a limited slip, or you'll have to get halfshafts to go along with a TII diff and a custom driveshaft.

 

S4 LSD's are clutch, S5's are viscous.

 

I'd recommened an 86-88 GXL, or 88 GTU rear end. It's a 4.1 rear, so you will retain ths shorter gear for better accelleration. Another bolt-in choice would be the 89-90 GTUs rear end, but they are hard to find and are usually quite expenisve. They do however, have a 4.3 ratio, which will improve acelleration 5% over the 4.1

 

FD Torsen into TII pumpkin into your car.

 

i have an LSD in my 86 n/a i got from a MAZTOY in oregon, i also have an 88 t2 will this b compatable? i dont think that the t2 has an LSD. sorry for hijacking.

 

all t2 have a limited slip diff.

 

hehe.

 

I just got a TII rear end with FD lsd in it, haven't put it in my car yet, still finishing the 13bt swap. Do you guys know how much I will gain 0-60 when I put the 4.1 in and take out the 3.9. (its a vert). My math I ended up with 1.2 secs faster.

How much better are the FD lsd then the s4 clutch-types, I haven't driven either.

 

i don't know about 1.2 seconds thats alot i barely felt a difference between the 3.9 and 4.1, i the 4.1 is a little quicker but not 1.2

 

I must of fucked up somewhere, but I've also heard that from other ppl. You've felt it, so your're right. How bout a 4.9? I saw a FB with a 13bt modded out with a 4.9, thats gotta be fast as hell.

 

You can put a miata 1.8 torsen into a NA housing. That's what I'd get (along with some 4.1 or 4.3 gears).

 

i'd love lower gears but they are expensive, anyone know where to get 4.3 gears for under 500 bucks? how about a rebuild kit for a 86 gxl lsd? that would be a nice upgrade for me

 

FD is way better then the S4. They don't need special fluid or have the clutch's replaced.

 

No one has mentinoed that if he uses the 8.8 rear end, he will also need to swap axles and have a custom driveshaft made to connect the NA tranny to 8.8 rear.

Stick with the NA rear!

 

clutch type na diffs work just fine for the power

 

Yah I have a S5 N/A tranny intalled. I can get a 88 N/A diff for a good price. Is it LSD?

 

I would choose Clutch Type over vLsd (poor me, having an S5 with vLSD)

but depending on your taste, Torsen is good if u don't want the hassle of rebuilding

 

Japanese rear-ends have a 4.3 ratio I think. I'm sure you could find a used one cheap. The aftermarket gear-sets available are usually 4.33, so they're even lower.

As for the LSD... If I was you and had $1000 to blow, I'd get an aftermarket clutch-type LSD (1.5 of 2-way). Otherwise, an S4 LSD (mechanical, out of a TII or a GTUs I think) would probably be a cheaper alternative.

 

The FD guys are finding S4 Turbo2 clutch type LSDs to swap into they car.. and all you guys want to find a FD Torsens to swap into your Turbo2 I swapped a Miata 1.8 Torsen into a 4.3 GTUs rear end, but that was just because it is better than the viscous.. and I found the Torsen for cheap. The clutch type LSD is actually very good, and does have advantages over the torsen.