Very familair with doing the swap in the Fbodies, have one to do in a 6.0 liter 1500 chassis truck

Were there any 1500/2500 with a manual trans? that would seem to be the best bet to reflash the PCM so it doesnt throw any trans codes.

Need trans, converter, crossmember, driveshaft, dipstick, flexplate. What are you guys using for shifter for truck T400?

Have to do some rewiring for the park/reverse/nuetral safetty switch backup lights etc.

Best to use the long or short tailshaft for the trans?

I can get fbody speedomoter to read I figure the 4L60E in the truck, I should be able to do the same thing

 

A TH400 swap is a step up in power handling but a step back-in-time in terms of technology. The 4L80-E can be swapped in, connected to your stock harness with an adapter, and the computer can be programmed to work with it only requiring a crossmember and some driveshaft modification. The TH400's you've been reading about for F-bodys can't even shift themselves.

There is a thread in the auto trans section you might want to check out.

https://ls1tech.com/forums/showthread.php?t=223683

 

I dont read about them, ive installed a bunch

The 4L80E swap isnt hard, we were originally going to go down that road. The motor/blower in the car should be getting around 120 mph traps in the truck, and thats the dead stock motor. There should be a real one and the boost turned up next spring. He said he doesnt drive it on the street and a T400 ends up about 50-60% cost of the 4L80, and there less aprasitic loss, and the converter and trans are much lighter.

 

you don't need a different flexplate(drill the one you have or have the converter built with an LS-1 pattern) or crossmember(flip it over). get a long tailshaft on it though, then you just cut down the driveshaft you have instead of making a new LONGER one. don't forget a yolk. the builder can put an electrical speedo pickup on it no problem. i haven't hooked up my backup lights and probably won't and you have to connect the neutral safety wires together to get it to start, haven't done a switch on that yet either but it hasn't been a problem. you CAN get a 400 with lockup. you don't have to get one that you have to shift manually, unless you want to, i did. backwards too. can't wait to hook up the transbrake.

 

yeah, but I not paying the $ it cost to put lockup in a 400. At that point Id tell him to get a 4L80E

Do you knwo the dimensions of the driveshaft right off hand?

Hows that truck run, what it trap?