No 3rd or 4th gear

[88hurstolds]

I installed an OZ of unknown condition, installed a rebuilt D5, new filter, lines, Dex 6 fluid and a new aluminum radiator.
When I pulled the pan there was just a thin layer of black gunk, no chunks or magnetic particles.
Probably need a rebuild but what would cause only 3rd and 4th not to work?
I have reverse, 1st and 2nd.
Is there someting that might not be hooked up corretly from changing the filter?
A clogged valve passage???
Just want to see if there are any tips or tricks before I swap it out for another...

 

[SSedan64]

Donny Wang may have been correct about the Black sludge. Direct clutches may be what was in the Pan.
Direct clutch is applied in Rev, 3rd & 4th gears.
Is Reverse strong, no slipping?

 

[88hurstolds]

Yes, reverse is VERY strong, I could do reverse burnnies probably
When I'm sitting in 1st with the foot on the brake the trans starts to shutter a little.
It's probably toast...
I have a couple others I can swap in while I get this one built to handle the motor I'm currently building.

Any other possibilities or comments?

 

[SSedan64]

In ATSG manual.
No 2-3 shift has:
Valvebody; 2-3 Shift valve or 2-3 Throttle valve stuck, gaskets.
Center Support; feed passages, sealing rings.
Direct Clutch; seals, check ball, clutches.
Servo; seals, passages.

No 3-4 shift:
Valvebody; 3-4 shift valve or 3-4 throttle valve, spacer plate orifice plugged.
Center Support; passages, sealing rings, bolts.
4th Clutch; Piston cracked, seals, clutches.