kenthemover

I rebuilt my sc10 rear end. Ended up buying one prebuilt. The rear end i bought is really loose. I cant find the small allen head in the cups on diff.
The one i rebuilt have those allen heads to tighten up rearend. How do you tighten the rear end without allen heads.
Its so loose when you spin one tire the other side barely rotates.
Kenny

RustyUs

Your diff, that you have bought "prebuilt", I'm assuming is a gear diff that normally comes in the SC10RS. It has no thrust bolt to tighten up/adjust like that on a ball diff. You will have to use diff fluid thicknesses to adjust your diff action on the gear differential.

RustyUs

The only SC10(s) that comes with a ball diff is the SC10 Factory Team kits, and the SC10.2 Factory Team kits. A regular SC10 kit/RTR/RS platform comes with a greased gear diff (at least there should be some in there to prevent wear and tear). The good news on the geared diff...it's a sealed unit and you are able to use diff fluid of your choice. If doing just general bashing, then I'd probably start with 5k ~ 10k diff fluid as a starting point.

kenthemover

No it seperates into two pieces. Mine a sc10 2 wheel drive. I know tgis cause i rebuilt one not having to good of luck. I just want to tighten up the diff.
Kenny

RustyUs

Yes, I guess you could say the gear differential consists of two main pieces...the differential gear and gear cover. Does it look like this one on the bottom?

kenthemover

No it doest. I cant figure out how to send photo to you.
Mines a ball diff. I think yours is a gear 4wd style.

RustyUs

Okay, I must be missing the whole point. Sorry.

If you have a ball diff in your SC10, then yes I agree, there's a thrust bolt to tighten down.

You said in original post, "Ended up buying one prebuilt." Was it the entire tranny that you bought? If so, I'd check the left side (driver's side ) ball diff outdrive for thrust bolt head. I always put mine (thrust bolt/diff adjustment screw) on the same side as the spur gear and slipper. It's always been this way. Somewhere down the line, in Associated's manual editors, they omitted the direction of the diff when placing it into the gearbox. Some will say it matters which direction the thrust bolt is. For me, it's just second nature to orient the head of the thrust bolt on the same side as slipper.

RustyUs

SC10 Ball Diff

SC10 Gear Diff

Two wheel drive, four wheel drive, or six wheel drive. Doesn't matter how many tires are being driven that determines what diff you, or I have. All depends on what type of durability, adjust-ability, feel, or maintenance a person wants. With all the high bite clay/AstroTurf tracks being run on, the 2wd platforms guys/gals are switching over to geared diffs.

kenthemover

That is interesting. Thanks for taking the time for that reply.
Ill look at the ball diff. When i did look at it i couldn't find the allen head inside the diff cup.
But im half blind.
Kenny

RustyUs

Well it just so happens I'm building a ball diff for my B4.2 buggy (same ball diff/tranny as the SC10).
The only other thing I can think of is the diff thrust bolt is normally covered up with a white-ish plastic cover.

All you should see is a hole for the tip of allen wrench to go into.