Please help with my pinion angle!
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Please help with my pinion angle!
Hey guys I have a 1979 f-150 short bed 4x4 with 315x85x15's on it. It ha a suspention lift on it but not exactly sure how much. I think i am having pinion angle problems. I think the pinion angle is to much on the truck. well checked the pinion angle at 15degrees. Ok in the back of my truck i have 2 blocks betweel the axle and the leif springs. They both hane angles on them. The big one is 3.5 high on the back side and 2 1/2-2 5/8 on the front side also it is 4 5/8 long. Now the other block is 1.900 on the front and 2.150 on th back side and it is 5.500 long. So both blocks are smaller on the front side and biger on the back side. The front rearend pinion angle is 10 degrees. Please let me knwo if on the back rearend i have to much pinion angle and also if you think the prevous owner put the lift blocks in the back backwards. What is the pinion angle suppost to be? The reasion i am asking is my truck is very very hard on back universals and driveshafts and we think its because of the pinion angle because the rearend dotn have any extra slop in it or anything.
thanks,
jimmy
thanks,
jimmy
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From: Elkhart IN
Stacking lift blocks is never good, especially angled ones. When you stack blocks, they will kick out alot easier. For pinion angle, you want it to be pointed at the output shaft of the tranny or t case. You dont want it up any higher because it can bind when you romp on it because the pinion turns up some.
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Jimmy:
I am a little cornfused????? Is the pinion too high, or too low? The blocks sound as though they are installed the right way, aside from the fact that you have one too many back there. It sounds to me like you have a serious axle wrap issue, and is causing pre-mature wear on that joint. You are only wearing out the very rear one right? Old springs, and both of those blocks might be the big factors here. Maybe it is time to replace the spring with one that will control the wrap, and lift it without blocks. Or maybe ditch a block, and do a shackle flip.
I am a little cornfused????? Is the pinion too high, or too low? The blocks sound as though they are installed the right way, aside from the fact that you have one too many back there. It sounds to me like you have a serious axle wrap issue, and is causing pre-mature wear on that joint. You are only wearing out the very rear one right? Old springs, and both of those blocks might be the big factors here. Maybe it is time to replace the spring with one that will control the wrap, and lift it without blocks. Or maybe ditch a block, and do a shackle flip.
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well yeah they have 2 blocks and the pinion angle is way to high. It has to be way to high. The front of the rearend (pinion) points to the top front of the bed instead of to the transfercase.
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Yeah that is a big problem. If it has too much angle (up) then the problem gets worse when you get on the gas. The pinion goes up even further, and is tearing up the joint. Suprised you don't get a ton of vibration out of it. Looks like it is time to fix the problem by removing the blocks, and maintaining the heigth by replacing the spring with the correct unit, for the desired lift. The "El Cheapo" way would be to turn one of the blocks backwards to loose some of that angle. I really can't believe I even suggested that as a fix, but I have seen it before. This is not the desired method, nor is having more than one block back there at all, but it will bring your angles back to operating range.
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From: GA
Originally Posted by 1978fordf250
well yeah they have 2 blocks and the pinion angle is way to high. It has to be way to high. The front of the rearend (pinion) points to the top front of the bed instead of to the transfercase.
check your spring perches for being bent or crushed allowing the axle to rotate under the blocksin the u bolts...you will see what i mean if you have this condition
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