The rear depends on how it’s been set up. If it’s running a transfer case drop and a shim in the rear then you need the shim. If it’s running a SYE with cut and rotated spring perches then you shouldn’t need a shim.
What do leaf spring shims do?
Steel shims to go between your leaf springs and your spring perch. These are used on leaf spring vehicles in order to adjust pinion angles and achieve proper drive line geometry.
What do Axle shims do?
Axle shims are thin pieces of metal that are placed between an axle and a leaf spring to adjust the pinion angle of the vehicle’s axle. Typically, the pinion being set at a slight downward angle at the drive shaft yoke is best.
What should pinion angle be set at?
According to Currie, the average car crafter should strive for between 1 and 3 degrees between the tailshaft of the transmission and driveshaft, and 1 to 3 degrees between the driveshaft and pinion. Furthermore, the two angles should be nearly equal (between 1 and 3 degrees), but always opposite (see crude diagram).
How do you know if pinion angle is off?
So what symptoms would lead you to identifying bad pinion angle? Drive train vibration at speed, wheel hop and universal joint fatigue/failure are all good indicators. These things can come out of no where with suspension bushing failures, engine and transmission mount failures or even leaf spring fatigue and wrap.
What is the ideal pinion angle?
How do you check differential pinion angle?
For instance, if the driveshaft is 2 degrees up from level and the pinion gear is 3 degrees nose down, then you have 5 degrees of pinion angle. If the rearend is nose up and its angle is less than the angle of the driveshaft, subtract the rearend angle from the driveshaft angle.
What should my pinion angle be?
What happens if you have the wrong pinion angle?
What should my driveshaft angle be?
1 to 3 degrees
Ideally, both driveshaft-operating angles will be 1 to 3 degrees. Anything over 3 degrees at the rear axle will shorten your universal joint’s life and could create vibration. If your angle is larger than 3 degrees, you must make sure not to exceed max driveshaft RPM as shown on this Spicer table.
Where to install axle shims on a 2016 Ford F150?
If lowering the shims should be inserted from the rear of the axle. When lowering the truck the axle pinion angle shifts down toward the ground. In order to counteract this the shim needs to be inserted from the rear of the axle to bring the pinion angle back up. Installed these with a 2” drop shackle on a 2016 f-150 2wd.
Can you put shims on the rear of a lowering truck?
If lowering the shims should be inserted from the rear of the axle. When lowering the truck the axle pinion angle shifts down toward the ground. In order to counteract this the shim needs to be inserted from the rear of the axle to bring the pinion angle back up.
How do you calculate pinion angle on a rear end?
If the angle of the rearend is steeper than that of the driveshaft, subtract the angle of the driveshaft from that of the rearend to see how much positive pinion angle you have. For example, if you have a rearend angle of 5 degrees from vertical nose up and the driveshaft is angled up at 3 degrees, you have 2 degrees of positive pinion angle.
When to change the pinion angle on a leaf spring?
When viewed from the passenger side, if you have to rotate it counterclockwise, the rearend is nose down. Now that you know the pinion angle, you may have to change it. On a leaf spring car, this is done with wedges between the rearend and the springs. Speed shops and sometimes alignment shops keep these around.
