Have you checked your U-bolt torque lately?
Are those bolts for the shackles at the appropriate tightness?
Are those bolts for the shackles at the appropriate tightness?
Correct caster angle for front axle FJ40?
- Thread starter Jerzfj40
- Start date
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Great timely discussion. I spent yesterday, and will more today, making longer shackles to correct my caster in front. I'm running a shackle reversal and just put on 2" lift springs, but the normal 2 3/4 shackles seem to bottom out on the shackle hanger too easily. Plus my alignment guy last month could only correct to -0.6* (before the spring change). So I'm hoping to correct all that.
My question is what's the best length to use (can go too high as I have clearance issues with garage roof). And I'm having trouble picturing how to measure shackle length vs the 1-2* correction I'm looking for.
But at -0.6* I do feel a small wobble at 50mph although I haven't discounted tire balancing yet.
Paul
My question is what's the best length to use (can go too high as I have clearance issues with garage roof). And I'm having trouble picturing how to measure shackle length vs the 1-2* correction I'm looking for.
But at -0.6* I do feel a small wobble at 50mph although I haven't discounted tire balancing yet.
Paul
Jerz, I definitely think that sagging your rear relative to the front would roll your front axle to the rear (clockwise if you're looking at the driver's side). But that would increase your caster, and like Pinhead says, you would see that in terms of tire wear, not in death wobble.
It seems to me that despite how it looks, 3 inches of extra shackle length might be overkill and may have rolled your FA too far forward giving you negative caster. Depending on where you started, I'll bet you have 0 caster, and that's what you're feeling.
A $5 magnetic bottom angle finder from NAPA would give you a good idea of where you're at.
It seems to me that despite how it looks, 3 inches of extra shackle length might be overkill and may have rolled your FA too far forward giving you negative caster. Depending on where you started, I'll bet you have 0 caster, and that's what you're feeling.
A $5 magnetic bottom angle finder from NAPA would give you a good idea of where you're at.
Paul, you may wish to use caster shims instead of playing with shackle length for the caster correction problem.
- Thread starter
- #25
IDave, That's a good idea assuming my garage floor is reasonably level, but i guess it would give me a close idea. Question though, what part of the axle would i find enough "Flat" to magnetically grab on to while everything is still assembled?
try adding a few hunderd pounds to the front bumper
Check the levelness of your floor with the level, and add or subtract accordingly.
I lay the bottom of the level on the tops of the knuckle studs (assume they are all the same length, at least eyeball) or, if you can squeeze in there, the top of the knuckle arm alongside the studs. May not be perfect, but if you're 3 degrees off you'll know it.