2014+ Lowering / Drop Kits

[07Softail]

Great looking truck. Could you snap a pic of the rear pinion angle? I have a slight vibration put in 6° shims but I think 4° would have solved it. Thanks

 

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A pic won't do anything for you. Every truck is different so add angle or take it out and see what your truck likes.

 

RT

[14 Silvy]

I know that just like to see. I tried 3° then 6° and it still has a very slight vibration. I had it at the dealer for a recall and they said my shims were in backwards Wichita I know is wrong. I have the pinion tilted down in the front and tech said it needed to be pointing up. I don't guess they deal wit dropped trucks very much I have been doing this for 25 yrs and this is the first truck that has given me any vibrations.

 

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[wuznme]

My guess is your transmission is pointing down, which is why the tech said pinion needed to point up. You probably need to put an angle finder on to see what's going on.

[14 Silvy]

Thanks that's the next step I put a trans spacer in and made it worse. I'll do more checking this weekend

 

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[DanHamilton]

you need to measure the angle and not just guess and throw parts at it. You can download a free application on your smart phone for angle finder and measure it, believe it or not its pretty damn accurate. Get the truck on level ground and measure the angle at the slip yoke at the front of the driveshaft and then the yoke at the pinion. That will tell you how far you are off. For example I measured my truck before and after just to see the rate of change (every truck is different, my numbers can not be relevant to anyone elses truck). Stock my angles were 7* at the trans and 8* at the diff. 1 degree high, after it dropped to 4* after a 2 inch drop (already had the blocks removed). So mine is off by -3*, I have 0 vibration issues and I have not bothered with it

[14 Silvy]

Totally understand I guess being 4wd makes a little bit of difference. I will do more checking today or tomorrow thanks.

 

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[14 Silvy]

Ok so I measured the angles at the transfer case where the u joint is its at 7° and the rearend is at 3°. Does this mean I need to add 4° more or would I replace the 6° with a 2°? Damn this is confusing lol.

 

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[DanHamilton]

If you already have shims in the trans or rear end id take all of them out and start over. It is going to be much harder to get the 2 close if your adding and removing shims. Depending on how far your drop is you shouldn't have to mess with the transmission angle at all, it can all be made up with the rear end since that's what is rotated down when you lower it

[14 Silvy]

Ok took shims out now trans angle is at 6° and rear is at 3°. So I'm thinking I need a 3° shim to raise front of pinion upwards?

 

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[DanHamilton]

correct

[14 Silvy]

Ok thanks I just thought the pinion needed to be tilted downward but if I match the angles it will be slightly upward.

 

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[DanHamilton]

Really all your doing to eliminating your vibration, a few degrees wont affect anything except how the gear oil is distributed in the diff. Have you driven it with it being 3* off yet? I know every truck is different but I am 3* off and have no vibration at all.

[14 Silvy]

Yes I drove it this morning to work and the vibration is still there gonna pick some shims up today and put them in this afternoon.

 

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[SATX]

14 Silvy -

 

Don't know if this helps but here is the angle measurement at my rear pinion.

 

 

 

[wuznme]

It helps him some, would need to know the tranny angle is well.

 

 

Really all your doing to eliminating your vibration, a few degrees wont affect anything except how the gear oil is distributed in the diff. Have you driven it with it being 3* off yet? I know every truck is different but I am 3* off and have no vibration at all.

 

You want it to be off some for pinion movement.

Edited August 29, 2016 by wuznme