Posted by jimg.allentown on November 13, 2014 at 06:09:28 from (98.115.105.174):
In Reply to: OT 4x4 pulling posted by L.C.Gray on November 12, 2014 at 20:02:40:
OK, here is the CORRECT answer. The front differential is not set up correctly. Bearing preload on the carrier is too tight. When I worked in Ford dealers, I repaired MANY trucks with the same problem. Explanation:
The front drive assembly is offset for clearance of the engine oil pan on most models. This causes a bias in weight/drag on the front drive mechanism.
When you engage the 4WD, the transfer case sends power to the front unit. This engages your "automatic" hubs. They should really be called one-way hubs. When they receive power, they lock up, but when you remove power, you have to back up to release them.
This imbalance in the location of the front differential added to carrier bearings being too tight causes pulling to one side or the other. There is enough friction in the carrier to cause a pull.
This is not easily detected by turning things by hand because when you have the wheels raised and try to turn a wheel, the side and spider gears turn instead of the carrier.
The fix is to disassemble the differential and set the side bearing preload correctly. If it is a Ford diff, it is set with outboard shims. If it is a Dana, the shims are on the inboard side of the bearings, and require removal of the bearings to replace the shims.
I can give you a procedure for measuring and setting bearing preload if need be. I have observed that quite a few of the 4X4s are set too tight right from the factory, Most will loosen up with usage, but a few are too tight to "wear in" so to speak.
My email is open if you need to discuss it further.
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