Thread: FD 4.88 Problem
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Old 02-16-2021, 03:53 PM   #15
norcalpb
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Quote:
Originally Posted by AlmondChassis View Post
The Brand is Weir Performance.
The differential was rebuilded with new Pinion Bearings, Carrier Bearings, Pinion Seal, Shims/Spacers and Washers.

I spoke to Spence Weir from Weir Performance. His a great guy and one of the best customer service I have ever recieved. He told me the issue is caused by 1) incorrect pinion depth 2) No pinion bearing preload (loose pinion) 3) No carrier bearing preload (loose carrier)


I'll be getting the differential stripped to inspect all those things and making sure it's all up to spec.
A side note, but Spence is the man. I've never bought anything from him but I did call him one time to talk about a diff noise I was hearing and it was one of the most informative conversations I have ever had about our drivetrains. I would trust his products 100%, and I'm curious to hear what your installer has to say once you 2 meet in person.
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