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I have a J3000 that I am planing on doing a frame swap with a Chevy 2500hd. I have a 6.0 Lq4 LS Engine and already have a rebuilt T56 transmission. Will a t56 fit in a J Truck?
Certainly there is plenty of length for a six-speed in a J-truck. If it's a 2500HD frame, your main concern will be how the drive train lines up with the body after you have figured out the mounts and such. Suggest you measure and mock it up, then decide. That's how such things are done, AFAIK.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Physically fitting likely won't be an issue since you are doing a frame swap. Though depending on the year, the GM frames are a bit wonky when it comes to fitting other bodies on them. Though its nothing that is insurmountable. But you will likely have to move the engine front to back so that it clears the cab, while also having the wheel wells line up with the front tires.
The T56 has a rear mounted shifter, so you should be good on dash clearance with the shifter. FSJ's used a 5" spacer between the bell housing and the transmission (When a V8 was used) to move the transmission back so that it cleared the dash.
As tgreese noted, in stock form, all T56's are RWD only. But can be adapted for 4wd.