4 link pinion angle

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Feb 8, 2025 | 06:44 PM

330pbr

Thread Starter

5th Wheeling

Joined: Nov 2023

Posts: 37

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4 link pinion angle

i got a heidts 4 link for my 56 and need help with it ,,, motor is 3degrees down
internet says my rear end should be 4-4.5 up
is this correct before i start welding...... what are you guys setting it at for best results

Feb 8, 2025 | 06:57 PM

52 Merc

Hotshot

Joined: Oct 2009

Posts: 16,194

Likes: 4,805

From: Burbank, WA

Pinion angle and crank angle need to match (be parallel), with the vehicle and suspension at ride height. Suspension type makes no difference. This is about u-joint operation and drive line vibration. If the engine is pointing 3 degrees down, you want your pinion 3 degrees up. 4.5 is too far out, imo.

Technical - pinion angle ? | The H.A.M.B.

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Feb 8, 2025 | 07:55 PM

CharlieLed

Lead Driver

Joined: Aug 2006

Posts: 8,095

Likes: 655

From: Brentwood, TN

The beauty of a 4-link is that the pinion angle is fully adjustable after installation by lengthening/shortening the bars. While it is true that the ujoint bearing need at least 1 degree variance the properly lube themselves, I don't think it possible to set up a driveshaft at zero degrees... 1 degree ain't much.

Feb 10, 2025 | 04:30 PM

Waygonner

More Turbo

Joined: Nov 2019

Posts: 552

Likes: 108

Quote:

Originally Posted by 52 Merc

I followed this logic when I installed my no limit 4 link a few years ago. Can confirm it works great with no premature joint wear or weird vibrations. Great summary!