Can anyone tell me what will need to be changed to replace my T5 with A TH350? I am installing a 383 in 86 Z28 that came with a T5, The problem is I origanally built the engine to go in a 49 chevy,with a TH350 balancing issues will not allow me to use the standard transmission flywheel, so I plan on swaping in a TH350, and was wondering if I need a different cross member, will drive shaft length need to be changed?

 

If all you're worried about is balancing, do what all the rest of us with 400s do.

Either take the flywheel to a balance shop and have it "unbalanced" to the stock 400 spec (that's the way mine is); or buy one of those "pork chop" balance weights.

To change to a 350, you'd need a different crossmember, different length drive shaft, and a different torque arm provision (could be taken care of together with the crossmmber). You'd need to add fluid cooler lines.

 

what do you mean by unbalancing the flywheel? is it as simple as removing any added weight from my T5 flywheel? The kit I used to put the engine together is from powerhouse, The kit came with a matched harmonic balancer and flex plate. The tech at powerhouse said the crank would need to be balanced for T5 application. I would rather use the T5 if at all possible.

 

They drill holes around one edge.

For that matter, you could theoretically do it yourself, since you have something to match it to; all you'd have to do is to "unbalance" the flywheel such that when put together backwards with the "specially balanced" flex plate, they come out neutral.

The tech at Powerhouse evidently doesn't build motors him(her)self.

 

Gotcha, Thanks for all the info