I had to replace the differential gear on my evader... I've got it installed and the car doesn't want to go full speed. It didn't want to move at first but i adjusted it a few times (1/8 in each time) but i'm not sure what the hell the manual means by "just snug." I don't want to overtighten it because thats what killed it the first time. The manual also states that it shouldn't be run too loose. PLEASE HELP!!!!!

It needs to be pretty tight.
If you don't mind taking the tranny apart again:
Pull out the diff, lock the outdrives with a couple hex wrenches, and try to turn the gear. If you can turn it(making the diff slip) it is too loose, tighten it up until it is nearly impossible to make slip.

When you re-install it, make sure the slipper is slipping before the diff.

Hold one wheel and the spur gear, and turn the other wheel. Can you see the topshaft and brake nut moving? If so, good. If not, loosen the slipper until it slips instead of the diff.

It'll probably loosen up some when you run it. So watch out for that. You NEVER want your diff to slip, because this is what wrecks your diff. The diff slips, the balls heat up, and melt themselves into the plastic gear.

yup had it happen before

Hey, Thanks alot for the info! You just saved me A LOT of frustration and money........now, if they could only hire someone with your kind of knowledge to write the manuals on these things.......

lol i cant tupe well enuf for them to lookat me

I won't say a word
rather than start a new thread...what's everybody's method of new-diff breakin? (im sure this is gonna help the guy)

I have a metal diff now, and i'm struggling to keep it tight. Here's how I do a break in now that i know what i'm doing.

Tighten it up as above, run a few tanks through the car, keeping an eye on the slipper tension to make sure that it's the one slipping. Then when i'm done, tighten up the diff again, and threadlock the nut.

Yeah i still have not much of a clue about this differential stuff. I don't even know how to tell when the slipper is slipping.. or what it looks like rather. I just have the diff tight.. pretty tight. If i turn one tire with the brake released, they both move in same direction until i hold the spur with my finger so it can't turn.. then the tires move in opposite directions. When i hold one tire and the spur and try to move the other tire, its pretty difficult. Thats the extent to my knowledge of diff adjustment.

As far as the slipper goes.. no clue. Got it looser and now it doesn't wheelie right off the line.. yeah i guess that had somethin to do with it. It hasn't broke yet so i guess im doin something right.