727 Won't Shift into 3rd Gear

[Brennon McGuire]

I have a stubborn 727 in my 72 Duster that will not shift into 3rd gear. I had a TCI manual valve body put in it and have had it built by what was supposed to one of the best shops in the area. With the car on jack stands, I can go through all the gears and feel positive feedback at all the positions on the indicator. However, soon as I get the car on the ground and drive it, it will not shift into 3rd. Any thoughts? It’s going back to the shop this Friday when I’m off. Thanks!!

 

[CudaFactHackJob]

If reverse is instant and solid then it's probably in the valve body.

 

[RTK_line]

If your problem started before you built the trans and put the vb in then you may have a bad case or mismatched parts. I built one with what ever I had once and ended up having to get the complete set of front and rear clutch packs and pumphousing from another unit before it would stop slipping. Just a thought.