944 spring plates & trailing arms info

[Tom Alltypes]

The 944 and 924 steel arms are a good fit to an IRS T1/T3 rear suspension. Use the 924 for the slightly less weight, they are not internally braced as the 944s are.

Use the 944 adjustable spring plates, with the trailing arms as this will also allow you to use the camber adjusters that is part of the anti-roll bar mounts. There is only a few relatively minor in installing them.

1) change the inner pivot bushing to a T1 on the trailing arms. Done, ready to install.
Note- the bolt pattern on the long torsion bar spring plates is different than the earlier shorter torsion bar s'plates, so get all matching parts and I suggest 924/944 stuff. Anybodies 26" torsion bars will work.

2) The adjustable spring plates from a 944 require a bit of clearance grinding to fit into the torsion housing. Obvious when you have them side by side.

3) The inner and outer rubber bushings are different on the 944 spring plates compared to the T1/T3. The inner is easily replaced by installing the T1 counterpart. The outer is a bit more difficult as it is bonded quite well to the spring plate. You can cut down the aluminum torsion housing cap from a 944 and it will then bolt up to the T1, or you can remove the rubber bushing and replace it with the T1 item. Maybe a wash in difficulty.

With these parts now installed, there is just one more step in getting the 944 anti-roll bar installed. You have to fab and weld on the mounts to the torsion housing, maybe graft on ones off a 944.

There are two clearance issues that you have to be aware of. The height adjusting bolts on the 944 spring plates are partially hidden by the T1 shock tower but still very useable. The other is the lock bolt sticking out the spring plate pointed at the tire from the camber adjuster/anti-roll bar mount. Depending on your rim/tire combo this could be an issue. It does clear on my combo on my Notch, barely. The offset of the 944 hubs gains clearance and a wider track in the 944.

Hope this breif overview helps.

[zen]

Originally Posted by Tom Alltypes

...2) The adjustable spring plates from a 944 require a bit of clearance grinding to fit into the torsion housing. Obvious when you have them side by side.

or maybe not so obvious. can someone point this out to me? mine fit in, but take a little persuasion via 4 longer bolts forcing the torsion housing cover to push everything in. not sure this is a good method, but seems to be working. that is until i realized i did not address this step...

Originally Posted by Tome Alltypes

...There are two clearance issues that you have to be aware of. The height adjusting bolts on the 944 spring plates are partially hidden by the T1 shock tower but still very useable.

the bolt heads will foul against the shock tower (where the spring plate nestles in over the stop). one fully and the aft just in movement. what have you guys done for this?