Hi everyone,

I'm currently building a 1978 toyota corona drift car. We'll be utilizing the irs from a 2013 scion FRS. This presents many problems but IMO has quite a few benefits as well.



Here's the diff with an older style axle flange in it. This means it's pretty identical to all the previous 8" toyota diffs. This offers a lot of options for the inner cv as well as the axle flange (pretty much every lexus, supra etc) This rear end will see a lot of abuse so it's a major plus.

I ditched the torsen that came in it in favor of a trd 2 way mechanical (this is the best type for what I do).

Now on to the axle problems. This is the weak subaru type axle next to a normal toyot 8" one:


Because it's a 70s toyota we wanted to keep the car 4x114.3 this was accomplished by fitting a 4 lug nissan bearing to the toyota/subaru upright. The OD of the bearing fit nice and snug in the upright and two of the mounting holes lined up. The outer end of a nissan axle also fits well with no interference. 

The current dilemma is we need to make it narrower by 6-7". Mounting points aren't a concern since we have to build new frame rails anyhow. Stock geometry will be maintained with the whole thing mounted as high as possible in the chassis. The idea is to narrow it in the middle allowing the use of cheap available replacement arms for when we hit things (walls, other cars etc).

I guess my first question is, in your experience does a shortened rear end tend to have axle problems? It looks like the motion ratio of the axle will be much different and I don't want them binding and breaking cages. Next question, do any of you find that it's worthwhile to build a jig before starting the process?

If anyone's curious about the car itself here's a build thread (don't mind all the bickering) http://jzxproject.com/bbs/index.php?showtopic=9957

Just wanted to put this stuff out there and see what comes back. Thanks for reading.

 

Last edited by aphxero (10/20/2014 6:45 pm)