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Old 01-09-2010, 07:52 PM   #1
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Hey guys.

I am just about finished rebuilding my losi 8T 2.0 and need some help.

I have issues with my rear diff. I appears that about a 1/4 of the rotation there is a tight mesh with gears. I have a new gearbox, ring and pinion gear, bearings. I almost think that something is warped ? I know this truck really well and just cant figure this one out. Everything seems to be right and square, but I just can't figure this one out. I have the aluminum gear inserts, and tryed it with the plastic ones as well. It is shimmed at the stock setup right now, but it also has this problem if I take out the shims as well.

I would be willing to bet that I could run the truck and everything will be just fine, But since it is getting ready for a new season, I want everything to be perfect.

This drag on the powertrain will take power
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Old 01-09-2010, 09:53 PM   #2
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Run it for about a 1/2 gal then tear it back down and re-shim the Diff and it should be OK after that.Some times it take a little bit for the New diff gears and stuff to fit and work right and after you get a little run time you can go back and re-shim and it will be butter smooth.
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Old 01-09-2010, 10:24 PM   #3
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Quote:
Originally Posted by thenova70ss View Post
Run it for about a 1/2 gal then tear it back down and re-shim the Diff and it should be OK after that.Some times it take a little bit for the New diff gears and stuff to fit and work right and after you get a little run time you can go back and re-shim and it will be butter smooth.
I agree with you. I need to break in the diff.


But....... One thing I did notice was that when I loosen the bulk head screws that enclose the diff, it did free up a bit. Kinda weird, but If I run it some, maybe the plactic needs to be wore in as well ???

Hopefully I can get some good weather to run it a bit.
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Old 01-10-2010, 12:08 AM   #4
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shim it tight, a little notchy, run it some and it should be good. thats what alot of people that i have talked to had to do with their losi. check it often the first gallon.
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Old 01-10-2010, 05:48 AM   #5
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thats normal and the worst thing people try to do is make it perfectly smooth. Then they tear up ring/pinions.

Remember that you run the truck, things heat up and tolerances change and get loose.

If you read through the Speed Shop thread you will see how we do it. This is the same way Adam Drake does it. Shim it until it feels notchy when the bulkhead back cov er is on. You want ZERO back lash or play. You want to keep it that way all the time. So if it breaks in and gets super smooth add another shim. Just always remember about the tolerances and things heating up.

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