So in another post I mentioned a newly rebuilt "motorhome" Torqueflite that turns out to be from a 2-barrel 383, making it about the least heavy-duty configuration.

This is going behind a 400-based stroker with great street manners, something that will be expected to pull a loaded 10,000lb trailer over the Rockies.

The transmission has never been run since the rebuild, it was a spare, so I was told. It also came with a brand new torque converter which judging from the size has a quite low stall speed. I will certainly use the converter and intend to use the transmission.

Let's say the transmission is from a 1968 Newport with 2-barrel 383. What will I need to change internally to be able to handle the torque? I am planning 550 lb-ft. The time to make the changes is now, because the tranny is clean.

So what needs to go? What stays? What gets added to?

Thanks,
R.