Rebuild 4l65(0)e when installing AA np205 output shaft?

[CJM72]

Hi Guys,

I'm trying to make some decisions regarding a 4l65e for my LQ9 swap into my 72 K5. The Advance Adapters NP205 kit requires the trans to be torn down to replace the output shaft.

Are you guys having your transmissions rebuilt when you do this? Seems crazy to spend $400 having the output shaft swapped on a junkyard trans without at least having it freshened up. I'm torn between paying $700 for a used 4l65e that still needs $400 invested for the output shaft swap. Seems like a risky $1100 investment for a trans with unknown history.

The other option is to have my Local builder put together a built 4l65e with my output shaft for around $2000. He just took in a nice 4l65e on trade (all billet shafts, drum, etc.) That he has apart for inspection. He built it originally ($4500) but the customer has upgraded to a powerglide to go with his new 900hp motor.

You guys just running these junkyard trannies?