8.8 pinion gear install




















Change the pinion shim from a. It's just difficult to get it in between. It's gotten to the point of "good enough" is the new "perfect. Joined Jun 12, Messages 6, Location California. Where is the shim for the pinion depth located, is it between the inner bearing race and the pinion head or is it between the outer bearing race and the axle housing? Snoopy49 said:. Click to expand Mach Active Member Established Member. Joined Mar 21, Messages 1, Location Albuquerque. I was surprised by how much wear the gears see.

I originally set my backlash very tight. After 10k miles and a lot of hard launches, the backlash has loosened up quite a bit.

A buddy of mine had a shop install his 4. They were quite, but now after a year of wear we are going to have to take it apart and shim it to tighten it up. I'd say its better to be on the tight side and deal with some gear whine. If you can hear it whine, just make your exhaust louder. Most of the factory gears I've removed were on the really loose side on backlash. Like, out of spec loose. Those were the ones that generally didn't make noise.

In general, the noisy factory gears were the ones that were on the tight end on backlash. The pinion shim on factory installed gears has been pretty constant at. Last edited: Mar 4, How does it compare with with a fresh setup? From and your. Designed 4. Just No Product safety.

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Just make sure that the bearings are fully seated. Shims that go between the bearing cup and the axle housing establish the ring gear position and bearing preload.

Re-use the original shims and check backlash and pattern see Chapter 7. Just as with the pinion shim, some adjustments may be required. Install the old left-hand ring gear side shim and then use a thinner shim on the right side to make it easier to install the differential for this first fit up. No play side-to-side can be present in the differential.

You can take care of bearing preload shimming at the final installation, once you have the gear pattern and backlash setting correct. Here, the differential shim is partially in place. It is the cast-iron steel ring with the light green and black stripes on it. The beveled edge goes toward the outside of the axle. It is an interference fit to re-install the differential.

Partially install the differential with the bearing cups and angle the shims in place. Note the two punch marks above the bearing cap surface inside the axle housing. These are the marks for the bearings caps. Since the shim is press fit, use the shim driver tool to install it. Do not hit the cast-iron shims directly with a hammer because they are very brittle and will crack. You can use a mill or a belt sander to make your own tool like the one left I cut out of fl at plate.

Be sure the curved shape accurately matches the shim diameter. You can also purchase a tool right that is actually a series of different curved shapes to fit just about any axle. Yukon Tool makes versions of both of these. Once the shims and bearing cups are driven in place left , install the bearing caps and bolts.

Remember, during the disassembly process, the caps were marked so they are oriented correctly from left to right and top to bottom. Ensure they go back into the original place and orientation. The bolt torque is 90 to ft-lbs; tighten them in stages, just like ring gear bolts right. I always use 90 ft-lbs to be safe. Set up a dial indicator and verify backlash and pattern one last time.

The dial indicator base has a magnetic portion that is temporarily attached to the axle housing; the dial position is adjusted to get the dial pointer in the correct position. Once in place, the dial face can be rotated to align with the zero position of the gauge. Check backlash in at least four different positions that are about 90 degrees apart from one another; there should not be more than.

The backlash should be. New gear sets come with a backlash recommendation in the instructions. Always use the backlash that the gear manufacturer recommends. If the backlash is not within specification, change the shim thicknesses accordingly to achieve the correct backlash. The amount of decrease on the left shim is the same amount that you need to add to the right shim in order to maintain the overall bearing width and zero endplay.

Once the backlash is correct and you are satisfied with the pattern see Chapter 7 , then you need to achieve the correct bearing preload on these bearings. If you are using aftermarket shims, add. The aftermarket units are thin shims stacked behind the factory cast-iron shims. Install the thin shims first and then drive in the thicker shim. The other option is to have an assortment of OEM-style cast-iron shims on hand.

This chart shows the required change in shim thickness as compared to backlash change. It is not always a one-to-one relationship. First, remove the differential pin retention cross bolt that was partially installed earlier and then remove the differential pin. Remove the pin to allow the axle shaft to go in farther than typical see Chapter 3.

This gives access to the C-washer groove. A small O-ring was installed in the groove of the stock axle shafts to help hold the C-washer in place during the initial build at the axle assembly plant. As during the disassembly process, always guide the axle shaft carefully through the axle seal.

If the spline is dragged across the seal, seal damage will result. They are known for their strength and reliability. This is a high performance Quiet gear, perfect for any vehicle from Stock and beyond, it wil Description: Motive ring and pinions are forged out of Steel. This is a high performance Quiet gear, perfect for any vehicle from Stock and beyond, it USD 9.

Pinion Seal - Description: Pinion Seal for Ford 7. Item : PSF8. Super Carrier Shim kit for Ford 8.



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