Hey Guys, I just bought a 87' chevy silv. 4x4. The truck has a nw jasper engine with a holley 502-6 TBI and has headers. The owner told me it had a 700R4 with a shift kit. I can not tell due to it shifts differently at times. It hits hard shifting from 1st to 2nd at about 4500rpm And sometimes does not shift back down to 1st at a complete stop.It will start off in 2nd or 3rd. Can anyone help?