I have been studying this for myself as I am into Autos right now. The hemi and 440 6 pack has a larger front clutch drum that handled 5 versus 4 clutch disk. Because part of that drum was larger towards the oil pump, the oil pump housing had a different part number and had the vent casting machined down for clearance, along with a rounded internal baffle to clear the front drum. The rear clutch drum also different to fit with the front. The KD band was wider. The KD lever was 5.0, and the KD servo used single lighter spring. This is the early style non cushion KD piston. The front clutch used 15 springs. The 70 an down used the same valve body as the HP motors. It had a deeper transfer plate for the rear/low servo apply. VB did change some what with 66-67 and then 68-70 versions. The accumulator did not have a spring used. Rear servo is common. My understanding is clutch and band friction material was different. Both planetary gears were 4 pinion. Were as 440-4 HP motors would have a 4 pinion front, but 3 pinion rear.

Early the input shaft and output shaft were a hd version. Later in 69 and up I do believe all the HP motors had the same input and output HD shafts.

71 seems to be different, as 71 was a major year for modifications to the trans and valve bodies for all models. 70 somewhat with late and early transmissions. So there are a lot of changes in part numbers and such. But for at least 70 down the above is pretty accurate.

So in the modern world with the advent of better friction disc and such, and the move towards lighter rotating mass, 4 disc and different drums are considered better in a street strip car.

Dragon Slayer - Thanks for the info on Hemi auto transmissions. A lot of info on hemi 4-speeds can be found on the internet and elsewhere but not too much on 727s.

Thanks much DS. I appreciate the detail you provided.

i can't state this as actual "fact", but wasn't the largest KD lever factory installed a 4.8 ratio ?
i always thought the 5.0 lever was a hustle stuff or direct connection piece ?
if kunkle sees this post, he will know for sure, as well as transman and others.

5.0 was the highest ratio that I am aware of in production use, for the Hemi and A12 cars.

These two transmissions were pretty much identical except the governor.

I assume this transmission is like thousands of others in terms of what the numbers revealed (not Hemi-specific) but since it's in my brother's estate, I need to come up with a value. I know it was rebuilt, had a shift kit and aftermarket torque converter installed. It didn't not have a lot of use but I can't speak to the condition but I assume since it's been sitting that it should come apart.

Any estimates you guys can offer would be far more accurate than mine. Thanks for your help.

As noted earlier - it’s nothing special and it’s not a Hemi box. I would pull the pan and see how it looks inside. If it needs to be gone through, then core value on a big block box puts it around $240-300.

If it’s pristine inside you may get more, depends on the market supply in your area.

That is assuming it stayed original. If this was being used for racing, the internals can be different. Can't really know with out disassembly. I just tore down the exact same trans part number, that was a modified one for a race car. The internals where all 1976 trans parts with a reverse manual vb. But nothing exotic. Bad part is it probably had a converter failure and lost oil pressure. So rear of case damaged, lots of damaged wear surfaces, plus poor storage and lots of rust.

Thanks Fellas. That helps.

Correct, and that’s why I advised to pull the pan. Regardless if the trans is an early or late style there isn’t much difference in price for a stock core.
While the pan is off you can see if it has a trick aftermarket drum or Hemi drum too. Same goes for the valve body.

Plated separator plate could be full manual or just a shift kit. Would need closer examination.

thanks for setting me straight ! for some reason, i always thought the 5.0 was [factory] aftermarket.
maybe it's because i have two new ones in old DC packaging.
Thanks again for untangling my head cavity !

Not sure how old you are - if you aren’t in your late 60’s yet things get worse.

HAHAHAHA !!!
i can almost see that the 70's are going to be AWFUL !