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.

Well, as far as I know there's only two 727 big block transmissions...Hemi & everything else, so you're 383 2bbl. trans is pretty solid in my opinion. There are a ton of "race" upgrades, but all I think you need is a transmission cooler....."maybe" a shift kit.

Problem with any 40+ year old 727 is you never know what's inside without pulling it apart. Even though the part number might ID it as a 383-2, it might have been upgraded over the years.

Well, PB, Chrysler built transmissions to the torque of the engine they were bolted to. Thee were three configurations for bigblocks, and the 383-2 got the one with the lowest number of clutches and planetary gearset pinions.

And JK, I doubt seriously that any modifications have been done to the transmission. But until I open it up, there's no way of telling. I've had it sitting under my workbench for 25 years. (Life got in the way.)

R.