superchargedv8

I just lowered the truck and am having a vibration issue on acceleration from a stop from about 15-25mph. This is a 2017 5.0 rcsb, anyone else come across this? Im thinking i need a different pinion shim than what came with the kit, anyone know the stock pinion angle/driveshaft angle.

rojizostang

I haven't looked at a truck like yours. Does it have a two piece drive shaft? Here's some reading for you:

https://www.f150forum.com/f66/13-rcs...ration-381741/

superchargedv8

The truck has a one piece drive shaft. As far as i know its identical to a 2016 model. I read that thread already and sevetal others but havent found one specifying a 2017 rcsb. The instructions said to install shims with fat side forward so thats how they went in.

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iTrader: (1)

Get a degree finder app for your phone. Check the driveshaft and pinion yoke. They should be 3* negative with the yoke aimed down.

superchargedv8

Ill look for an app if not ill just go buy an angle finder. For the mean time does anyone have a pic of the stock pinion angle just to make sure im headed the right direction. I beleive the shim that went in there was a 3 degree shim

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iTrader: (1)

Look online for proper pinion angle diagrams.
It's easier to know what you're shooting for with a pic to help.

rojizostang

I would like to see a picture of that drive shaft. Where is the slip joint?

superchargedv8

So i got an angle app. I placed phone on pinion flange and then on flat surface on driveshaft. The difference is 8 degrees, I would need a taller shim than what i have there to get me to the 3 degrees. Im assuming that driveshaft collapses correct?

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iTrader: (1)

Does your pinion point up, level or at the ground?
I have a feeling you put the shims in backwards.

rojizostang

I would reallyreally like to see a picture of the drive shaft set up, if you have time. Converting to a one piece drive shaft is an idea I've been considering for a while and I would like to see how yours is set up.