Factory High Stall Torque Converter

[marks73]

Does anyone have the information concerning the High Stall Torque Converter out of a 72 CJ with 9 1/2 bolt pattern? I really can't seem to find any accurate info on it.

 

[OMS]

72 and 3 CJ's used it

10 inch converter

2500 - 2800 stall

 

[marks73]

That sounds more reasonable. Hell I was seeing anything from 2500-4000 and knew that wouldn't be right. But couldn't find any Ford documents.

 

[hyena429]

That sounds more reasonable. Hell I was seeing anything from 2500-4000 and knew that wouldn't be right. But couldn't find any Ford documents.

Ya..according to some sites..the 73 4v like i got...has a 3,000 rpm stall {2800 im sure isnt too far off the right mark} But i heard the same......and yes mine does have 9"1/2 bolt pattern..Ill try to snap some pictures of mine...It the same as the black one you posted..besides mine is painted green...I have compared it too a 3500 stall..a 4,000 rpm stall my freind has for his drag cars...and it does seem to be around a 3,000 stall in size.

From ebay motors Ford's Small Block C6 - A Gem

Many 1972 -1974 351C-4V CJ engines were mated to Ford's C6 automatic transmission. Ford used a special high-stall (3000 RPM) torque converter (D20Z-7902-A) and flywheel (D1ZZ-6375-C).

not sure how correct that is..but my stall defenatly has a 9 1/2 bolt pattern and fly too match it

 

[hyena429]

Sorry for the bad pics...I using my desktop cam to get the pictures...but its 9 1/2 too each bolt hole...The whole vert is barely 10 inches across...this vert been in my car for atleast 20 years that i can account for...and my car was basicly stock..original carb and everything still on it...Im pretty sure its factory...and looks identical in every way too the black vert you just posted..lol

 

[marks73]

Anybody know where Ford might have hidden their specs?

 

[Tnfastbk]

another thread from another forum

http://www.network54.com/Forum/119419/thread/1219583534/Piston-Converter+question+351c+4v+Q+code+Mustang

 

[hyena429]

I been looking for years for the official ford specs...But i cant find them..I found alot of dif motor mags stating 2200 too 3000....I believe its closer too 2800 too 3000..cause every where i read most 3,000 rpm verts are 10 inches wide...Lower the rpm the bigger the converter...My 4 bolt converter above is 10 inches across...9.5 too the bolts...and driving my car for over 18 years...i know it wouldnt start to pull good till 2800-3000 rpm..Then it would become a diffrent animal..I use to think it was mainly the heads...Till i took apart the motor and seen the little vert in there...thats one of the many reasons why she didnt come alive till 3,000...lol.."including the heads" Those big 4v heads are really made for race and high revs...with out the little vert...My car would fall on its arse every time i tried to take off from a stop.

 

[Totalled]

Yep. We went from a CJ converter to a truck 400 converter. Talk about no stall. It lugged just going into gear at idle.

The 2,000 stall I have in there now is a nice compromise.

 

[c9zx]

Anybody know where Ford might have hidden their specs?

I've never found it in any Ford manual. Probably in a supplement I don't have. I've heard a lot of numbers over the years. The number I've heard most often and makes the most sense to me is 2000-2200. Without a REAL trans cooler and the gears available from the factory a lot more than that would be heating the trans fluid too much for the factory to warranty. The stall speed is not precisely fixed. It will vary somewhat depending on the amount of torque the engine makes. Chuck

 

[turtle5353]

I heard that the slashes //////// around the perimeter of the converter can give you an idea of the stall speed. The more straight up and down they are the lower the stall speed and the more they are leaning over the higher the stall speed. Not sure if its true or not, but its just something i have heard over and over again throughout the years. ?????

 

[Don C]

That is true for at least AOD and AODE converters, as I found out when researching to replace my C6.

 

[will e]

So if I want to go with a higher speed converter (I have the stock version for 2v heads) do I need to swap out the flexplate too?

 

[c9zx]

So if I want to go with a higher speed converter (I have the stock version for 2v heads) do I need to swap out the flexplate too?

Only if you want to use the original Ford CJ convertor. The aftermarket convertors are designed to fit the standard flex plate, not the CJ. Chuck

 

[marks73]

So if I want to go with a higher speed converter (I have the stock version for 2v heads) do I need to swap out the flexplate too?

Only if you want to use the original Ford CJ convertor. The aftermarket convertors are designed to fit the standard flex plate, not the CJ. Chuck

Chuck, Do you know if the torque converter will only fit the C-6?

 

[hyena429]

I heard that the slashes //////// around the perimeter of the converter can give you an idea of the stall speed. The more straight up and down they are the lower the stall speed and the more they are leaning over the higher the stall speed. Not sure if its true or not, but its just something i have heard over and over again throughout the years. ?????

Now if thats true...then the slashes on my vert are agressive...they are waved over...not strait up and down.

http://reviews.ebay.com/ebaymotors/Ford-351-Cleveland-Engines-Key-Facts-amp-Information?ugid=10000000001410755 Pretty good read on them...read the bottom where it talks about the vert....I know my car didnt pull till 2800 and above...For a fact..I drove the thing for 18 years..hehe

 

[c9zx]

So if I want to go with a higher speed converter (I have the stock version for 2v heads) do I need to swap out the flexplate too?

Only if you want to use the original Ford CJ convertor. The aftermarket convertors are designed to fit the standard flex plate, not the CJ. Chuck

Chuck, Do you know if the torque converter will only fit the C-6?

I'm not 100% certain. I believe the CJ converter will only fit a C6 (won't fit a C6 used behind a FE series engine, different pilot diameter). Chuck

 

[Precision Transmission]

I've picked up several of those convertors over the years, but everyone of them had eight (8) studs. Never saw one with only four, except in pictures.

Don

 

[Bill73Ragtop]

I have a 4-stud unit in my 73 vert. I added it after the guy who rebuilt my C6 back in 1995 offered me a NOS unit as part of the rebuild. I had to order a special flywheel to accommodate the smaller convertor.

I just re-installed it back into the car after running with the original stock convertor for the last 10 yrs. Stall speed is 2500 - 2600.

Originally I ran it with a pumped up 71 351M code and a 3.25 TracLok which was a really nice combo. Running it with my (rebuilt to mostly stock) 1973 351H code and the 3.25 TracLok is not what it should be. I'm planning on pulling the convertor out and replacing with a 1800 - 1900 stock style unit sometime in the next couple months. I would have to agree that the amount of torque the engine is putting out has a very significant impact on performance.