Trans build advice?

[5.7man]

I have 92 c1500 700R4, just lost 3rd and 4th. I’d like to do a stage two build with plans to drop a 383 in it later down the road. It has a stock 350 in it now. 
 

Is a performance build possible with the stock motor in it now? Any suggestions on master rebuild kits? Stall on torque converter? This will be a daily driven truck. 
 

thank you

[CamGTP]

You can build the transmission while it's still a stock engine, it doesn't matter that it's not making a ton of power right now.

 

The stall you choose on the converter needs to be matched with however large the camshaft will be. A big cam that makes lots of power up top will want a higher stall converter compared to a camshaft that only makes power between 2,000-6,000rpm.

 

I wouldn't be the guy to ask about what place sells the best rebuilt kits.

[richard wysong]

Unusual to lose 3&4 in a 700, usually it's pump problems, possibly repairable without a rebuild