Posted by jimg.allentown on April 07, 2020 at 06:27:29 from (24.115.193.250):
In Reply to: News isn't good posted by Geo-TH,In on April 06, 2020 at 07:28:55:
There certainly is a lot of discussion over this simple thing. I have set up many rears in my lifetime.
Here is some information:
There are only FOUR things to set up in a differential!
1) Pinion depth. This is the relationship between the housing and the pinion gear. This was originally set up at the factory using a special fixture to gauge the actual location of the gear. Replacement pinions are marked with a plus or minus and a number. If not marked, they may be considered to be zero. Unless you are replacing the pinion, this will remain the same and requires no further consideration.
2) Pinion bearing preload. These bearings require a bit of tension against them to operate properly. Again, unless the pinion is disturbed as in replacing bearings or the seal, it requires no attention. If replacing the seal, you tighten the yoke a little at a time until you feel a slight drag. That is close enough. If you go too far, you will need to replace the crush sleeve if it has one. Some rears use a crush sleeve, some are just shimmed. Here, just common sense applies. If you start to feel a slight drag, it is close enough. Note that if the seal isn't leaking, leave it alone!
3) Carrier bearing preload. Just like pinion bearing preload. Just a little drag is good enough. This is set either with shims or adjustment sleeves. Shims are a bit more time consuming. Unless you are replacing the carrier, just re-use the same shims.
4) Backlash. This is the only really critical adjustment. This is the clearance between the ring and pinion gears. Normal is around .005 to .009. Again, unless you are replacing the carrier, the same shims you took out are correct.
Things to know:
Ring and pinion gears are a matched set. They are machined and fit together when they are manufactured on special machinery. You cannot "mix or match" them. They are a set.
The smaller gears inside the carrier are called side gears and pinions. They are also referred to as spider gears. These each have a washer behind them. These are the gears that allow for differential action. That allows the wheels to turn at slightly different speeds as when going around a turn.
This is not rocket science or nuclear physics. There is no "black magic" or voodoo involved. It is straight forward nuts and bolts with a couple of fixtures added in. Anybody with a reasonable mechanical ability can do it.
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