My T-10 4-speed is done it makes so much noise you can barely hear inside the car so I am going to swap in a TH350. can anyone tell me what I will need
to go from a manual to auto? I plan on using a B&M mega-shifter and B&M torque arm mount.

 

Think you have the bulk of it covered.. you'll have to find a dipstick and tube that will fit too. I dunno what will work though, never done it myself. Your driveshaft and crossmember should work though.

 

So now I have two options I can go with the TH350 or a T5? will my 4-speed clutch and flywheel work with a T5? Has anybody used a T5 with a mechanical clutch linkage?

 

My '83 had a T5 before I swapped to the T10. The clutch and flywheel are the same, they will swap right over. Infact, I didn't even take off the clutch when I changed over to the T10.

'83 T5 cars used the mechanical clutch linkage just like the 4-speed cars. Find a bellhousing and fork from an '83 and it will work with your mechanical linkage.