So I bought a limited slip off a fellow member on the forums here and just brought it into a shop today. They opened it up and told me it was a torsen lsd. As I had expected, I couldn't directly bolt it onto my car due to the housing being a different shape than the stock IS250 differential housing. But then another bigger problem was that they couldn't do the house to house swap for me because they had to make sure the specs were right and weren't sure which one to go with. So here's what mine and their question is: Whoever it is that's going to do the swap for me, should they go along with the specs for the 1988 MKIII Supra or my '12 IS250? Any advice/answers would be appreciated but I have to know asap. Thanks!

 

Anything internal to the LSD itself should use Supra specs, externally (ring gear, pinion depth, patterning) you should use the IS specs.

MK3 Supras never used Torsens in North America, only in Japan (JZA70, 08/1990 production on), so the chances of it being a Torsen seems slim, unless someone had already swapped the differential into the 88 Supra. From the factory MA70 Supras here used 4-pinion Clutch-type LSD's.

Jeff

 

I don't know then. When they took apart the housing, one of the guys said it was a Torsen. My mechanic also asked what kind of oil should be used, he said that traditionally the oil is pumped into the housing after the lsd is put in, I'm not familiar with the process at all so what would kind of oil would you recommend? Thanks!

 

It depends if it's a Torsen or not. Torsens typically use regular gear oil (75W90 or 80W90 GL-5, can use Toyota/Lexus Synthetic LX 75W85 if it's a Torsen T2, I don't know how well it would work with a T1), while the clutch LSD (if that's what it is), will require an additional friction modifier, either by getting a gear oil with it already in there or adding it afterward. Ford's friction modifier works pretty well and is cheap.

Jeff

 

Alright, thanks for your help!

 

Start by posting pics of the LSD itself we can help you confirm what LSD exactly it is. Then tell the shop to use Jeff's advice on what specs to use.

GL!

 

My mechanic's assistant told me it was a torsen LSD after opening the housing (looked like a torsen to me). The LSD is at my mechanic's shop rat the moment and I'm calling some more shops in the area to get some quotes on pricing. I'll see if I can get some pics and post it up when I can. Thanks!

 

Hey guys, update here. So unfortunately I wasn't able to get any pics, the guy just told me to leave the car there and he would take care of it (same guy who did the lsd install in my mustang two years ago). left the car yesterday morning and drove the car back this morning, everything feels the way they should so there shouldn't be any problems. I actually went a little too fast on one of the on ramps here in my area between two highways and my tires squealed a little (I'm running on tires with almost literally no tread left) but the limited slip did it's thing and the entire ramp felt smooth. finally no more one wheel hop when traction control is on