Drivetrain T-5 transmission issue

[Ch3No2]

I’ve got a t-5 attached to a well built 393w. I’ve never gotten on it. Drove it 3times since finishing the engine. I rolled it into my basement put it in gear, jacked it up with 4 stands, took it out of gear. upgraded the entire rear suspension and then found tdc with a piston stop . Installed new distributor , put timing tape on harmonic balancer. Went to roll it out to tune won’t move an inch.

Disconnected the driveshaft from rear end. Rear end spins great. Tried to spin drive shaft while t-5 in neutral can spin it about 45degrees and it stops.

Will shift into 1st, second, third, fourth, and fifth. Will shift into reverse. Won’t go into neutral.

I pulled the engine and trans. Trans is on my work bench. Disconnected clutch cable fork we thought it may be bent. It’s not.

Still won’t spin the tail shaft or input.

Someone said clutch may be sticking to flywheel. Maybe, but with the trans removed and in neutral it should spin no?

I’m not mechanically inclined on transmissions but I’m mechanically inclined enough to be able to learn quickly .

Thanks for all advice in advance .

 

[AeroCoupe]

Tear it down. They are pretty easy to work on and the manual for them is readily available online.

https://tremec.com/wp-content/uploads/2023/05/TRSM-T5-0510-R1_173.pdf

Remember, this covers all variants but if you read through it you can see what applies and what doesn’t.

Most likely just pulling the top cover off will allow you to figure out what is jammed up.

 

[Noobz347]

If you roll the thing over, can you hear any [crunchy bits] moving around?

 

[2000xp8]

Was the trans rebuilt at some point by someone in the recent past?
I've found over the years that this type of issue was generally caused by the person that rebuilt it (which includes professionals)

With that said, i would tear it down and fix it.
But if the 393 is indeed well built, sell it and buy a tremec before you turn it into a pile of worthless scrap metal.