Anyone know where to get a rear gear box at? Everywhere I have looked don't have them.

tekno rc shows them in stock.

Are you looking for the complete diff? Tower has them in stock.

so every think should be good when I get it then

yes, the original thin larger diameter shims are the correct ones.

no, see above.

i just built my truggy, I dont recall the size of the shims
anyone have any pics of both old and new side by side?
I guess Ill find out on rebuild!

I'm confused are you talking about the diff shims put on over the outdrives, or the internal shim/washer that goes under the gear on the inside?

I decided life was too short to deal with the external shims and just throw the diff in the housing as is. Typically doesn't have much play anyway.

Thank you!

I have a strange story about my Tekno cust service experience. Has anyone else ran into this?

I bent the chassis on my ET-48. I emailed Tekno and they told me to send it in and they would give me a 50% off coupon code for a new one. I sent the chassis in via UPS. I tracked it in and it was shown received and signed for at their location on a Tuesday. I sent Tekno anther email asking what I had to do next. They replied that they only check their PO box on Mondays?? I replied that it had shipped UPS not USPS and have not heard anything back as of yet. If I had sent it in via USPS, what business checks their mail once a week?

a telephone is your friend.

Right. That was going to be my next step. Just wanted to know if anyone else has experienced this...

I also did not use the shims. All is good with mine. I imagine after a bunch of packs through it things may loosen up but everything is still pretty tight in there.

Just to be clear, I am certain it is the shim/washer under the gears inside the diff that is causing diffs to lockup because they are collapsing (becoming concave.)

I am talking about the shim on the ouside. If you are talking about the washers inside the diff under the gears those have to be there. I think they had a redesign after the initial batch to increase the diameter of the washers. I think they were about the same size as the gear (I can't remember, I haven't opened them up in while) which is the new style. I assembled mine according the instructions and I have not had a problem at all with my diffs.

Yeah, I was actually replying directly to Mizchief, in order to clarify which shims/washers were still causing issues. The initial batch of shims that shipped with the truggy were correct, but not the correct hardness. They replaced those with a different shim that worked, but is collapsing after extended use. Tekno is now getting the original shims in the proper hardness, which should correct that problem. I agree with you about the shims on the outside of the diff , but those have not caused issues other than difficult install. I think this topic got confused from the initial post about it a few pages back, post #3025. That is the post I am concerned with, as those washers have been an Achilles heel for the ET48.