Caster Shims Question

[Icy Fishy]

I have a 1988 HJ61 (JDM) and I intend to install caster shims to correct steering wandering at highway speeds. I intended to order 2 pairs of 2.5* shins for a total of +5* caster. But I received only 1 pair. I’m considering going forward and installing them in the hope that I only need +2.5*.

Based on measurements from the fender to wheel hub, I believe the vehicle is raised about 1” over stock. It has aftermarket shackles front and rear. Bolt to bolt the front shackles measure about 5” and the rear shackles measure about 6”.

The alignment guys in town measured my caster at about -1*.

Is it possible that adding 2.5* is enough? Or should I order more shims?

 

[3_puppies]

no idea on what to use, but a few pointers
new U bolts should be used
check the center pin and make sure it is long enough to go thru the shim and axle plate
make sure you install the shims correctly, facing the correct way
the long shackles aren't helping your situation, cheap way for lift but causes other issues
shims should be steel

 

[Skniper]

Is it a good idea to stack smaller shims to get to a bigger correction? I'd rather just have one solid (steel) shim under there....if it's common practice to stack shims then ignore me.
Several vendors here have multiple steel shim options.

 

[BurntToast]

Is it a good idea to stack smaller shims to get to a bigger correction? I'd rather just have one solid (steel) shim under there....if it's common practice to stack shims then ignore me.
Several vendors here have multiple steel shim options.

I wouldn’t stack shims, probably can’t get the alignment pin through both

 

[DrRock]

Since you have a small lift, I would bet the 2.5DEG shim will do the job. That said, this is a bit down to personal preference. Toyota typically has low caster to keep the steering feeling light, more caster+heavier steering. If it were me, I’d put in these shims and see how you like it and go from there. Also, make sure your bushings are healthy and that your toe in is per factory spec as both these items can cause the wandering you describe.

Cheers, James