Bolt in Sprag For 904 Trans

Thanks for the help ABODYJOE, I was reading some past post from
07 when you were arguing between the 904 and the 727 and you seem to
know abit about these transmissions. This is the 2nd trip to tranny shop in last 15 month. 1st time was because the kickdown linkage was not adjusted right. I had it rebuilt and it was fine until I was doing
a burnout and broke the posi unit and the axle broke. I figure that is when the sprag broke. I had the tranny guy install a manual Turbo Action valve body in it the 1st time it was in the shop. As they took it apart this time the sprag seems to be the only real problem that I know of at this point. Is there anything I should have them do at this point to make this my last trip. I know things can happen and I will try and start my burnouts in 2nd gear.
The motor is a 360 with a streetable cam. The rear end is now a 8 3/4 with 488 gears. I am not push anymore than 350 HP and that is probably on the high side and it has Aluminum Heads on it. Let me know if you have any ideas on upgrading what I might need to do while at the shop so I don't have to go back. I think the shop is good but they are not the Mopar shop I would like to have like the guy you were talking about you have. Anybody else's advice will be appreciated also. Thanks.