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QuickStyle

2/4 drop causing extreme positive pinion angle

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just did a 2/4 drop on my 04 SS (spindle, shackles, hangers). you can visually tell the driveline and pinion are pointing up, so i check with my angle finder and it calculates out to POSITIVE 7 degrees, i understand a slight pinion angle change can occur, but this is not right. leaf spring rear ends should be NEGATIVE 5-7 degrees. is this something that happens because of the lowering, i didnt measure the angle prior to installing the lowering kit, so i dont know how it was before

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I see you have the hotchkis rear sway bar..... where did you get that?

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A couple shims might help

I would need about 14 degrees of shims to make it correct, seems like a lot. im thinking more along the lines that something is wrong. the kit came with a 1 degree wedge to correct pinion angle, but thats clearly not enough.

 

I see you have the hotchkis rear sway bar..... where did you get that?

it came on the truck when i bought it

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I would need about 14 degrees of shims to make it correct, seems like a lot. im thinking more along the lines that something is wrong. the kit came with a 1 degree wedge to correct pinion angle, but thats clearly not enough.

 

it came on the truck when i bought it

You should sell it to me. It may cause harm with that drop..... lol

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You should sell it to me. It may cause harm with that drop..... lol

do they not make them anymore? i have the front one too

Edited by QuickStyle

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do they not make them anymore? i have the front one too

yeah you got lucky Hotchkis doesn’t care about our trucks anymore they have moved on to newer trucks

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Your pinion angle and yoke angle have to be the same to avoid vibration. Since the one at the tranny/transfer cant be changed, the axle must be rotated to match the opposite angle. Do a search for pinion angle and you will get more diagrams than you need.

 

The 4 to 6 degrees is not uncommon when ride height is changed, but more won't hurt anything. The important thing is the angle is the same at both ends. (But wait, I said that already.)

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do they not make them anymore? i have the front one too

Unfortunately they do not anymore....

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installed 8 degree shims. im now sitting at -1 degrees. looks much better. i thought stock was -5 to -7 degrees, but after verifing a few other 99-06 silverados visually and they all seem to be stock at 0 degrees or so, found one with a 2/4 drop and it had the same -7 angle as mine originally did, so i guess this is normal. i figure -1 degrees should put me at 0 under load at the power level im at, just perfect. not sure why the drop kit doesnt include a shim to correct this.

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On 3/22/2018 at 6:48 PM, QuickStyle said:

installed 8 degree shims. im now sitting at -1 degrees. looks much better. i thought stock was -5 to -7 degrees, but after verifing a few other 99-06 silverados visually and they all seem to be stock at 0 degrees or so, found one with a 2/4 drop and it had the same -7 angle as mine originally did, so i guess this is normal. i figure -1 degrees should put me at 0 under load at the power level im at, just perfect. not sure why the drop kit doesnt include a shim to correct this.

post-27531-0-02539200-1521768864_thumb.jpg

Where did you get the 8 degree shims ? 

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