Question on your diff prob - are you shimming them? Mine don't last without shimming, but I'm only running an 8XL. I'm running GA alum cases and collar with flm diff cups, but shim mine so they start tight. Seems to work.

The weak link in stock trx diff is the spyders and the RRP stuff doesn't seem to be as good as the stock diff parts, so I'm not surprised about your experieince with RRP. I have a Supermaxx (and a DacePredator) and spent time on UE - known prob over there with RRP diff parts for a Tmaxx.

UE diffs are currently available new but pricey. Used can be found but you have to watch ebay and or the UE BST forum to find them. 8 Spyders are real hard to find used here lately. That is if you need cases and all. If you don't need cases, the 1/8th diffs (6 or 8 spyder) are in stock at UE and aren't geared as high as HB diffs if that makes any difference. There are a few UE lightning based guys on UE and they would tell you only solution to your prob is 8 spyder UE diffs - I know, they've been telling me same thing!

Did the 4-Tec start out as the elec version? Nice work, looks trick!!

I raced a 4-Tec pro for a while and have a 2.5rtr. I want to put a TZ in when I find a big place to run in. I see I am back to 1st post again, was posting in temp forum when I got started here....