Torsen differential Q's

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Postby Rally Guy » Tue Nov 30, 2004 9:11 pm

Man, the amount of differing information about these is comical. I can only add my anecdotal information...

My '88 ST165 sure seemed to have an OPEN rear dif - one of the reasons I sold it.

My '93 ST185 sure seems to have an LSD rear dif - one of the reasons I BOUGHT it.

Just adding a few data points. Does anyone know for SURE what years came with what?

In the Porsche world - there is an option code sticker you can check to see if your car has nifty things like an LSD (mine DOES NOT). Does the All Trac have ANY way of knowing what options came on a specific car??

RK
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Postby toayoztan » Tue Nov 30, 2004 11:41 pm

NA wrote:There has to be some sort of pattern.

you could start something like this up.

Model year Front Diff. Rear Diff.

Example:

ST165 1988 Open Open

if you dont know dont guess or you could mess up the results.


I believe all the front diffs were open. It's the rear that is questionable (torsen or not). For the middle diff, i don't know if all came with VC or not.

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Postby CMS-GT4 » Wed Dec 01, 2004 12:49 am

All front diffs are open. All center diffs are VCL, except for early 165's.

Rear is open on most. The only proven gt4s to have come standard with rear torsen are the 185RC/CS and the 205.

Some claim that there are some 185s that came with torsen, and some claim that only '93 model came w/ torsen standard.

On another note, there is a code on the door panel to determine the gearbox and rear diff. It seems the code only shows if you have a CS model gearbox w/ torsen or not.

The BGB lists 2 seperate diffs for the '92 year. Open, and torsen.
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Postby toayoztan » Wed Dec 01, 2004 1:11 am

Alright, i've got my spare rear diff from my 92 sitting in my garage. Sometime this weekend or so, i may as well open it up to see the mystery behind it. Does anyone have a picture of what i'm supposed to be looking at or for if i have a torsen or open? Thanks!

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Postby CMS-GT4 » Wed Dec 01, 2004 3:45 am

Torsen looks like this.

It also comes apart with a different snap ring, I believe. I remeber the BGB telling a slightly different way to taking both apart.

Image
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Postby Gary » Wed Dec 01, 2004 3:53 am

The one from our cars

Image
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Postby 92 All-Trac » Thu Dec 02, 2004 11:53 pm

Would the torsen diff be a direct swap into a 185 that came with a viscous unit? How much do those go for used?
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Postby CMS-GT4 » Fri Dec 03, 2004 2:03 am

I think you mean an open unit... and from what I understand yes. They use the same housing, just use different methods of snap rings. See bgb.
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Postby damselracer » Fri Dec 03, 2004 3:59 am

a friend of mine that has owned a lot of toyotas over the years told me that, at least in the RWD celicas, the supras, the cressidas, and the trucks, the diff code will tell you whether its limited slip or open. If it ends in an even number, its an open diff, but if it ends in an odd number, its an LSD. Since thats just about everything RWD that Toyota makes, its safe to guess that would be true for the rear diffs in the alltracs as well.

Anyone who knows for SURE what theirs is and can tell us their diff code care to confirm or deny this?
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Postby coyoteboy » Fri Dec 03, 2004 8:56 am

Can anyone also tell us where to find the diff code? I've had a quick look but i cant find anything other than the standard vin plate.
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Postby BoostedBlueToyotas » Fri Dec 03, 2004 12:39 pm

Its on the sticker on the drivers door

on my blue 90 alltrac I have tranny code listed as
A/TM - 737/E150F

The 737 means something but not sure how to decode it (I know
on my 93 MR2 turbo that 735 indicates that the MR2 has limited
slip differential)
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Postby CMS-GT4 » Fri Dec 03, 2004 1:58 pm

I forget what the first number means, but I remember that the RC/CS box was 151.
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Postby 92 All-Trac » Sat Dec 04, 2004 2:36 am

I thought all All-Trac's came with a viscous rear-end, or a torsen? I didn't think any came with an open axle. That wouldn't give very good traction since torque in a open diff goes to the wheel with the least resistance.
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Postby toayoztan » Sat Dec 04, 2004 6:24 am

92 All-Trac wrote:I thought all All-Trac's came with a viscous rear-end, or a torsen? I didn't think any came with an open axle. That wouldn't give very good traction since torque in a open diff goes to the wheel with the least resistance.


yeah, that would make sense. I've just been going with what i've seen posted all the time. All alltracs have open front and VC center. It's the rear that is either open or lsd.

on my blue 90 alltrac I have tranny code listed as
A/TM - 737/E150F


So are we checking the last number for even or odd on 737 or e150 set of numbers? And what's A/TM mean? thanks!

Bryan
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Postby Gary » Sat Dec 04, 2004 10:07 am

E-150F is the transmission code.
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