Pinion Angle for Slammed Trucks

[KyleSeal]

Im currently laying frame with a Porterbuilt front end and a DIY rear (step notch, factory arms, watts link) and am curious on pinion angle setup.

I have carte blanche when it comes to setting the transmission tail shaft height / angle, and am using a 2-piece driveshaft with the semi solid carrier bearing.

This is also with the CPP trailing arm crossmember.

What would the ideal transmission tailshaft angle be, along with the rear differential at ride height? I can adjust the rear with shims so if need be I will.

[KQQL IT]

Close to zero as possible.
And a slip yoke like this will decrease the rear shaft angles compared to a gm truck slip

[KyleSeal]

Originally Posted by KQQL IT

Close to zero as possible.
And a slip yoke like this will decrease the rear shaft angles compared to a gm truck slip

Close to zero at the tail shaft of the trans? Or the diff?

[KQQL IT]

Tailshaft, the pinion agle will depend on your end ride height.

[HO455]

There is an ideal angle when setting up a static system but vehicles are always a compromise due to changing locations of components in relation to each other i.e suspension movements. Add in different service applications and the numbers can be quite different

Is it a long bed truck?
What engine/transmission combination are you running?
You say "carte blanche" does that mean raising the transmission tunnel?
Are you locked in to using a 2 piece driveline?

I recommend having this conversation with the folks at Porterbuilt. They have experience with these trucks and will know the limitations your likely to run up against.

Here is a good calculator to help you and I recommend watching the video. Both for know the correct method to measure the angles and the vocabulary knowledge to make for clarity in conversation.

https://spicerparts.com/calculators/...gle-calculator

[connorm]

From what I have read, make sure that your engine/transmission bushings are all in good shape then adjust your driveshaft to that. The visual that I have attached shows how they should be in relation to each other. Although if you look more into offroad driveshaft angles they talk about some more extreme pinion angle differences through the travel of the suspension. With factory trailing arms and the CPP crossmember that should help you with the angle change through the suspension travel.