Good to know that the cheaper traxxas 3768 retainers do the trick. I also have BB rearsprings on V2 shocks. I don't like how the normal rear ones rub....
trans part are not that hard to find. Bare in mind that you probably will use the B4/T4 topshaft (easaly available) and the idler gear is also same as modern cars. So we're talking diff gear. That is still easaly found on ebay. And custom works (4351 Custom Works Differential Assembly) sells the dif...