Should I move my rear axle forward?

[nutt7]

I have a rough country 4" spring lift and I recently removed the rear shims since they angled my pinion too high. I ordered Kert's EZ inch to reinstate the lost height from the shims. Should I utilize the one inch offset to move my axle forward? (See pic) I have stock shackle mounts and I only want to do this once. I am not sure how the axle moves under compression or droop. Thoughts?

 

[kgblazerfive]

Axle does not move any father then the distance the front spring mount lets it.

Which means not at all.

 

[LIVEAnimals]

I wouldn't move it

 

[82355]

No.

Martin

 

[rebelgregory]

Looks fine to me.

 

[nutt7]

Thanks, I'll use the center of the EZ inch!

 

[chulisohombre]

Another vote for leave it centered on the zero rate. I would doeble check angles again after putting the zero rate in though. It's thicker than a typical shim and will push the axle farther away from the transfer case.

 

[cybrfire]

Axle does not move any father then the distance the front spring mount lets it.

Which means not at all.

Actually, the tire moves rearward in the wheel well as the suspension compresses. Spring flattens out. Differnce from arc'ed measurement to straight line measurement will tell you how far your axle will move.

Usually not an issue with the rear wheels but just for point of fact.

 

[kgblazerfive]

True but the front spring mount still doesn't let it move

 

[Deuling]

True but the front spring mount still doesn't let it move

But the rear one does...

 

[cybrfire]

But the rear one does...

Precisely. The shackle allows the spring to lengthen out as it flattens out under compression. So, regardless of the spring hanger at the front of the spring not moving, the spring still grows in length under compression so the rear axle moves rearward.

 

[Stomis]

Besides you've got this backwards. You want to stretch the wheelbase out not make your departure angle worse by moving it forward.

 

[nutt7]

With 35s, I am pretty sure I was rubbing the rear of the wheel well trim when compressed so I just wanted to avoid that. The burb does have a long ass though, I've drug my hitch and banged my bumper ends a time or two. Most of the time my wheeling is pretty mild though. Currently it's on 33s so rubbing is not an issue until I move back up.

 

[AgDieseler]

I only moved my rear axle forward 1" when I switched to an ORD rear pack that had some decent arch to it (4" or so). Total rearward movement of the center pin was minimal, but my 38" MTRs did impact the trimmed fender. Never rubbed with a flatter spring, full fender, and 37" BFGs.

I'd suggest you use the center mount, and see how it moves in the fender. It can always be adjusted later.

 

[454Sub]

Yes the axle moves, lol, how could it not? As it compresses the axle swings in its arc towards the rear of the vehicle, so at ride height it is best to have the axles slightly towards front of wheel well, so at full stuff it centers itself and requires less trimming.

I mean seriously guys, how on earth could it not swing in an arc, having one fixed point on a flexible spring? Common sense tells that since the shackle swings, obviously the spring would move relative to the wheelwell, not counting the fact that the spring itself is flexible, and flattens or curves more depending on what its doing.