Near new built 727 - not driving thru 3rd gear....

Hi guys I have a almost new 727 with the following parts:

Rebuilt by Lofgren about 3-4 yrs ago
Kolene steels
Alto clutches
not sure which bands off the top of my head
Steel drum
B&M deep pan
Griner RMVB
UCC convertor
PPP shifter
Fresh Type F fluid. With the pan off it looked ultra clean inside, as mentioned it has had very little use.

Shifts into and drives thru all the gears fine with the car on stands but no drive in 3rd gear. Reverse is fine as well.

Any suggestions? It shifts into 3rd fine with the shifter itself as well.

I will check the shifter for proper adjustment again but would have thought that would'nt be the issue as getting drive in all gears except 3rd.

Any suggestions ?