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Old 03-25-2009, 10:28 AM   #1
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Default How do you know when it's time to rebuild the diff in your B4/T4?

Just curious....mine just doesnt seem "smooth". Sounds noisy, and I'm sure this aint how it's supposed to be out the box. The car has some miles on it for sure.
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Old 03-25-2009, 11:22 AM   #2
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I'm thinking now would be a good time for you. Yeah, whenever it starts to get a really notched or crunchy feel to it, it's time for an overhaul.

Half the time all you need to replace is the two sets of balls (the ten or however many it is going around the edge of the diff gear and the 6 thrust bearings under the screw in the right outdrive), because you can flip the rings over and just use the other side.
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Old 03-25-2009, 11:49 AM   #3
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Quote:
Originally Posted by OTE_TheMissile View Post
you can flip the rings over and just use the other side.
Or you can take 360-400 grit sand paper and sand the diff rings smooth again. Put one ring at a time on the flat outdrive and put it down on the sand paper. Hold the outdrive and move in a circular motion till the visible "groove" is gone.

It will have cross hatches in the ring from the sand paper, but that is good. Gives the balls something to "bite" against.

Either way, definately a good time for a rebuild!
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Old 03-25-2009, 12:04 PM   #4
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I never replace my trust bearing
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Old 03-25-2009, 12:06 PM   #5
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Please check out the BFast Diff thread, you will not find a better diff.

http://www.rctech.net/forum/electric...ssociated.html
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Old 03-25-2009, 12:13 PM   #6
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Quote:
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I never replace my trust bearing

Should not have too unless it has been torque down to hard...
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Old 03-25-2009, 12:38 PM   #7
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I never replace my trust bearing
Man that is just silly, half of your diffs smoothness is in the thrust assembly.You should at least clean and re-grease it when you service the diff.
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Old 03-25-2009, 12:54 PM   #8
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Man that is just silly, half of your diffs smoothness is in the thrust assembly.You should at least clean and re-grease it when you service the diff.
+1
Many consider it to be the weak link in the diff assembly
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Old 03-25-2009, 01:02 PM   #9
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I never have to do anything to my thrust when I rebuild , just new rings and diff balls, thats all I`m usually replacing ...
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