Road Runner Nest

we just got the tranny rebuilt and a shift kit put into my roadrunner. we got the tranny put back in but it takes alot to even spin the tires. but in reverse it is fine. we are going to call the guy that rebuilt it in the morning. Do any of you guys no what the problem may be.

Did you have a stall converter put in? I have one in mine and hate it, rather have instantaneous action when I romp on it.