Thread: irs suspension

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Have a look at this link. Here are many tips and measurments:

http://www.snowwhiteltd.com/inst_37-39chevycross.htm

Hi Scully
I am not sure if you got my reply. But here is some more info. Make sure you have the pinion angle correct, it should be parallel
with the engine, it should not be inline (this can leads to premature wear), just at the same angle, we try for 0 deg on the engine and pinion, this is because the later xj6 rears are designed for this and have the correct side brackets to put the pivot shafts at 0 deg also. this requires you have your center diff mount plate at 6 deg sloping down to the front( the top surface of all the jag diffs (all years) is 6 deg in relation to the pinion, it is the side brackets and top subframe mounting stamping that make the different pinion angles on the earlier car (XKE 6deg, 3.8s 3deg etc) If you do not get the pinion angle and engine/ trans angles correct you will get vibration through the car at certain rpm, just like a drive shaft that is out of balance. We also like to isolate the diff and other suspension components like Jag did and our cross members incorporate this. For your shock angle question, I would get the shocks to the correct factory angle by moving the top mounting inside the frame and re-locating the bottom lower arm mounting further in, this is a very common problem on the trucks when using the wide suspension and this is how we usually fix it, also as mentioned you could relocate the lower mount outwards but I am not sure this would give you enough angle

Mike Bontoft
CWI inc
www.cwiinc.com