CUCV not shifting into third gear

[Ethan Phillips]

I have an m1028 with the TH400 and it does not want to shift into third gear. Itll shift from first to second with a little hesitation but doesnt want to shift to third or go past 50 mph. Theres also a little hesitation when shifting to reverse. It all worked fine this morning until I got later on into my drive

 

[BGR]

My 1009 did that for a bit. If Im not mistaken it ended up being the vacumm pump.

 

[m38inmaine]

Could be multiple items, pump, switch on injection pump, modulator, rotten lines and the line T, oil level, lots to check, been there done that.

 

[Ethan Phillips]

UPDATE:
I sent the trans in for a rebuild. Third gear was completely burnt. Torque converter sounded like a maraca, gear pump was shot, and had 3 different types of clutch discs. The person who rebuilt it before me didn't rebuild it right. This is the second time its been rebuilt with the first rebuild being in '02. What had happened was the gears weren't getting sufficient pressure and they started slipping. I still dont know what caused the convertor to grenade on the inside