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Old 01-17-2010, 11:16 AM   #1
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Default rear diff question

When building a rear diff should it feel "grindy" when done. I tightened it all the way and then loosened 1/8 of a turn like the manual said and it feels rough. Do I loosen it more until it is smooth? Add more diff lube? Thanks in advance.
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Old 01-17-2010, 12:00 PM   #2
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rear diff on what?

it should feel very smooth, most likely it's to tight. no need to add extra grease, it just gets slung off the diff when things get spinning.
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Old 01-17-2010, 12:15 PM   #3
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rear diff on what?

it should feel very smooth, most likely it's to tight. no need to add extra grease, it just gets slung off the diff when things get spinning.
It is on a TC5. Thanks for the info. I will add some grease and loosen it.
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Old 01-17-2010, 12:39 PM   #4
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if it feels gritty after a rebuild the diff balls are flattened and need replaced
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Old 01-17-2010, 12:51 PM   #5
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if it feels gritty after a rebuild the diff balls are flattened and need replaced
If I loosen it more than 1/8 it feels smoother. Should I do that instead. The car is fairly new, so I don't think the diff balls are flat, thoughts?????
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Old 01-17-2010, 12:53 PM   #6
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if it was overtightened it will flatten them,try loosening and go from there but you may need new one's down the road
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Old 01-17-2010, 12:56 PM   #7
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It is on a TC5. Thanks for the info. I will add some grease and loosen it.
my post said NOT to add more grease.
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Old 01-17-2010, 02:15 PM   #8
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You should loosen your diff to the edge of no slip or very little slip under pressure.
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Old 01-17-2010, 03:16 PM   #9
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my post said NOT to add more grease.
It said to tighten until spring is compressed so I figured that was when it couldn't go any more by hand tightening it. I will loosen it a little more and not add grease. Also, how do you know if it slips? Is this only possible after driving it?
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Old 01-17-2010, 03:20 PM   #10
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The diff rings are probably a little worn, it happens with use.

You should tighten your diffs a little at a time until you can no longer slip the diff with your hand.

Then either run it, or run it in on at the table by holding one wheel and using a little throttle. Then retighten it until it doesn't slip.

Or watch how the European champion does it here:

http://www.youtube.com/watch?v=YOMu6...layer_embedded

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Old 01-17-2010, 06:02 PM   #11
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The diff rings are probably a little worn, it happens with use.

You should tighten your diffs a little at a time until you can no longer slip the diff with your hand.

Then either run it, or run it in on at the table by holding one wheel and using a little throttle. Then retighten it until it doesn't slip.

Or watch how the European champion does it here:

http://www.youtube.com/watch?v=YOMu6...layer_embedded

Regards

Neal
If I grab the rear wheels and turn them in opposite directions should they move easily or with some resistance?
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Old 01-17-2010, 06:09 PM   #12
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A tiny bit of resistance... but it should feel pretty free and very smooth. Its the kind of thing you need to be shown in person.
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Old 01-17-2010, 06:13 PM   #13
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Quote:
Originally Posted by 20 SMOKE View Post
if it feels gritty after a rebuild the diff balls are flattened and need replaced
+1 Work you diff as you tighten it and NEVER tighten it all the way, the manual settings are almost always too tight.

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If I grab the rear wheels and turn them in opposite directions should they move easily or with some resistance?
Chuck a small allen key across the top plate in one of the holes on your spur to hold the spur then grab both tires at the same time and spin in the same direction, it should be just tight to the point it doesn't easily slip, free is fast. Here's a vid to help you out.

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 01-17-2010, 06:28 PM   #14
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A very good video! Watch and learn+++
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