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Old 06-25-2006, 03:52 PM   #1
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Default diff problems, help needed

Hello all,

Recently my diff has been playing up a bit , when it was new it was lovly and smooth and fairly free, it got a bit gritty so i rebuilt it, and its never been the same, so i decided to start from scratch, im using new thrust plates, a new screw,new bearings in side the diff and out, the old diff spring and some cyclone ali out drives that came with my lovly surikarn kit , the same gear, new d rings new thrust balls and new diff balls. i run it in by tightening it on allen keys so it doesnt slip, i pop it in the car and run it at 2v, i hold each wheel for 10 secs then tighten so there is no slip(they way i like it), but it feels like theres lumps in the diff still? so it gets very tight in action well before it stops slipping and nearly everything is new.

Cheers to every one that takes the time to help me out.
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Old 06-25-2006, 05:56 PM   #2
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it sounds like flat spots on the diff balls,washers or thrust assembly
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Old 06-25-2006, 05:58 PM   #3
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i never do final diff adjustments until i get to the track.i leave it somewhat loose and tighten it at the track until the slipping stops.if you overtighten the diff it can put flat spots on the balls or washers
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Old 06-25-2006, 06:46 PM   #4
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Not sure how your diff is built, but here's a guess. If there is a snap ring that holds the thrust bearing in place, it's possible that you bent that while removing it. If so, it will grab the thrust ring and not allow it to spin properly. If there's no snap ring, then please ignore my post.
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Old 06-26-2006, 01:42 AM   #5
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Thanks all,

But still no cure, as the balls washers and rings are all new i doubt they have flat spots just yet!, one of the few things that is not new is the diff spring, could this effect the movment of things?

Cheers
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Old 06-26-2006, 02:06 AM   #6
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Quote:
Originally Posted by Xrayskid
Thanks all,

But still no cure, as the balls washers and rings are all new i doubt they have flat spots just yet!, one of the few things that is not new is the diff spring, could this effect the movment of things?

Cheers
I had a few weeks ago bad rebuild results of one of my diffs and found that a bad thrust bearing caused it. So don't only focus on the diff balls itself. Just a idea. I changed the thrust bearing & the 2 rings and the problem was gone.
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Old 06-26-2006, 02:50 AM   #7
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Yeah the thrust bearings seem to be the cause of a gritty diff most of the time.
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Old 06-26-2006, 04:31 AM   #8
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i run the cyclone also and the diff is a little tricky.make sure that all the thrust balls are there.they are real easy to lose.i believe there is 6 of them.other that that just check for dirt buddy.there is much more to check for if all else is good.i would also try to go back to the standard spacers in the diff gear.the bearings may be binding the diff up.
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Old 06-26-2006, 05:31 AM   #9
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thanks to all im off to rebuild again
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Old 06-26-2006, 11:50 AM   #10
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I separate the two issues whenever I have problems.. I take the diff before I screw it together with the thrust bearing, and rotate it while applying pressure inwards.. should be smooth, and any grittiness should be noticeable, and would tell you it's the balls or plates.

Then, I take the thrust, and rotate it with my fingers applying pressure inwards. I also check the inside bearings to make sure they run smooth.

Beyond that, there's not much to check.. to break it in, I have a drill press, and made a "T" bit for it. I tighten the diff just enough to allow a bit of slippage, spin it in the press for a minute, and retighten. For me it can take 4-5 minutes worth of spinning and tightening to get a fully broken-in diff. I've run it outdoors in races and on my street for a few weeks now, still smooth. I now have ceramic balls in there, but it still applied when I had steel balls.

I also run the plates over 600 grit sandpaper, helps with any excessive slipping.
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