SALEEN961
Well-known member
- Joined
- Jan 1, 2023
- Threads
- 6
- Messages
- 282
- Reaction score
- 356
- Location
- Radnor, PA
- Vehicles
- 2021 F150 XLT 302A
- Occupation
- Automotive Technician
Any time you change the shackles to lift or lower your truck, the pinion angle will change. Any time you remove a tapered block or replace a tapered block with a non-tapered block, the pinion will change.
For some people the change will be small enough to not matter, and for some the change may even improve their u-joint operating angles compared to what they had stock. In every case the u-joint operating angles should be checked to verify whether or not pinion angle shims are needed.
To give you a point of reference, my truck has no vibrations from 0mph all the way up to the speed limiter. My u-joint angle at the slip yoke is roughly 0.2° and the u-joint angle at my rear diff is roughly 1.4° with my truck sitting in park in my driveway. This difference in angle is a little higher than I'd like, but I never installed shims because I never had any vibrations. I normally aim to have my pinion nose down 1° from the point where my u-joint operating angles would be perfectly even at rest.
For some people the change will be small enough to not matter, and for some the change may even improve their u-joint operating angles compared to what they had stock. In every case the u-joint operating angles should be checked to verify whether or not pinion angle shims are needed.
To give you a point of reference, my truck has no vibrations from 0mph all the way up to the speed limiter. My u-joint angle at the slip yoke is roughly 0.2° and the u-joint angle at my rear diff is roughly 1.4° with my truck sitting in park in my driveway. This difference in angle is a little higher than I'd like, but I never installed shims because I never had any vibrations. I normally aim to have my pinion nose down 1° from the point where my u-joint operating angles would be perfectly even at rest.
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