Rear springs backwards?

I was wondering if my rear springs possibly being backwards could have something to do with my flat pinion angle and distance between transfer case and axle. The thing is, I put in a t176/d300. I'm just kind of hoping it could be something simple that can solve all my issues. Anyways, do stock rear springs have a front/back?

 

They do on the Earlys, so probably do on the Intermediates.

 

measurements from center to eye are same on both sides, 23.5"

 

I had thought the rears are symmetric (ie no front or back) - but I'm not certain. The fronts are clearly asymmetric. Who's springs are they? If they are BDS, call them.

The pin to eye measurement is one factor. The arch could be asymmetric though. Have you got an angle finder, or even a bubble level? If the arch is symmetric, when the spring is standing upside down on a level surface, the axle pad surface should be level too.

 

Are your tires setting rearward in the wheel wells? If so, this may mean the pins are set closer to one eye, meaning they are asymmetric, and are on backwards. It seems my springs in my 4wd Hardware kit were asymmetric. If the pin was more forward, this should make the pinion point up more since the axle is setting on the uphill part of the front of the spring. I had to leave off the 2 degree supplied shims because my pinion already pointed up enough.

 

well...




tim, they are Omix stock replacement springs

Bcfarms, do you still have those shims laying around?

 

Omix isn't known for their quality.

 

I'm pretty sure I didn't throw them away. If I find them, you can have them.

 

Ya, both are symmetric if memory serves. Maybe be the only symmetric spring ever created,

 

Looks like the spacers under the crossmenber are gone and the angle shims are missing also, what kind of lift are the springs. Is that what you call "flat angle"?

 

they are stock replacement by Omix. Didn't come with any shims. I'm just making sure the springs aren't on backwards so I can assess what I need to do next.

By the way, at what degree are y'all setting your axle pinion at? I've heard about 3 degrees less than the transfer case yoke.

 

Get one of the cheap angle finders from Harbor freight and measure the angle. Tom Woods has a good discussion of how to set the pinion angle on his site. For a conventional driveshaft, you split the angle change between the transfer case end and the pinion end.

http://www.4xshaft.com/ -> Tech -> Geometry 101

 

Thanks Tim thats exactly what I was looking for.

 

The u-joint angle at the transfercase should be as close to the u-joint angle at the differential pinion yoke as possible. Less than 3* by far. The shorter the propeller shaft (driveshaft) the closer the angles should be. If under 18" they should be the same angle. If longer you might be able to get away with a larger angle difference. Most transmission, transfer case, and driveshaft vibration/noise issues I've run into have been caused by u-joint angle issues or loose/worn ujoints. Even cheap new joints can cause problems due to poor manufacturing.


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The angle measurement won't be accurate until the body is on ie, weight on those springs.