E-revo probs need help.(rear tire shake/shimmy)

[phildogg]

Hey all looking for help with a problem I'm having.. I picked up a used E-revo the other day and took it out for a run.. As soon as I hit the gas I get bad tire shimmy/shaking from the start under hard acceleration.. it does have aftermarket hubs and tires. I have checked a few things but found no solution. I don't think it tire balance as it happens right from the start. the tires are on tight but still have some play. has new stock axles installed, one thing I noticed while tearing it down is it has the adjustable upper A-arms ,and stock lower. could this cause the issues? the carrier being non aligned? I have new arms coming and will prob replace the bulkhead also. lmk what you think..
phil