As i said in an earlier post i had done my research and am aware of the issue with the diffs.
the diff nut is 2mm and is locked in place by another 2mm nut, it is almost impossible to adjust and set the diffs correctly, several people have modified the diffs using as has been suggested D4/b44 parts.
the remaining issues have been the quality of the gears and drive rings, actually there is nothing wrong with the quality of the gears the issue is in the shimming of them. just like the BMAX if you dont shim both the main and bevel gears correctly they will be stripped by the second lap.
however the kits from Answer RC are now shipped with a nice pack of shims for this purpose and having spent this afternoon pottering in the workshop have come up with several solutions to the diff problems, simple cheap and painless.
so first thing strip the kit diff, at which point you will understand how difficult it is to get hold of that 2mm nut!!.
then go on the internet/phone DMS and order associated AS31167 which are TC5 outdrives.
you end up with these
tc5outd.jpg
find the 2mm nut and push it into the T nut carrier and for a £4.99 plus P+P your done.
tc52.jpg
as with all the cars i have rebuilt the diff using ceramic diff balls, my personal choice is the vampire ones again from DMS or your local X factory stockist.
onto the diff rings, stock kit ones are notchy and not smooth. according to our american friends "BFAST" are the dogs, however i have not used them so cant confirm, i can however confirm that losi XXX-cr shims are a straight fit and i had a pair so in they went.
i used the stock kit gear however for those who wish too BMAX gears drop in. not sure on the bevel gear as that is the next job.
one thing i did notice is the bevel gear runs eccentric, on initial inspection of the RTR diff and the PRO diff both bevels ran with the same eccentricity, i assumed a poor moulding, however it is just not fully seated, a quick tap on a hard surface and it runs true, just to confirm i did it to both diffs and it cured the problem.
put the diffs in the car paying particular attention to the bevel gear shimming and all was smooth.
because i can and i have the necessary parts i am going to run one car with the kit gears and the other car with alternate gears (BMAX) to see if indeed its quality or just proper building thats the issue.