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Lo-Stahl to "Higher" Stahl Converter

JG71B

JG71B

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Just out of curiosity really, I have a 78 bone stock 400 4 Barrel motor out of a C body, matching trans, coverter etc. with 57K miles. I'm not touching it other than a set of headers, performer intake and new Edelbrock carb I have. The original converter to it has a low stall sticker on it, my question is am I better off leaving the original converter because it is a matching combination or would I get any advantage out of a higher stall converter? This is going in my 71 Charger with a 323 Sure Grip. I get different Engines with different amount of power will give a different stall speed in the same converter, etc.Thanks in adavance
 
I think a bit more stall would probably help you but I would not get carried away. I put a 2400 11” one in my stock 440 with 3.55 gears and its really too loose for me just driving around. I think it actually would be better with a 3.23 rear. Although bury the throttle and it really moves out.
 
I have a 10" 3000 PTC in my street driven Charger that acts almost stock when just cruising around until I stomp on it, then it really wakes up. I have over 55,000 miles on this combo to Date.
 
Just a guess but 727 in 78 may be a lock up converter and older won't fit. May be hard to find a upgrade.
 
Curiousyellow71 said:
Just a guess but 727 in 78 may be a lock up converter and older won't fit. May be hard to find a upgrade.
Click to expand...
JUST realizing this! Worst case I have another 727 at hand. This just was original to the motor, miles and all. Its just a cruiser for now anyway. Finally going to get it on the road after a long 15yrs+ of being dormant.
........
just checked, luckily no lock-up. Thanks all
 
Last edited:
I like the factory 10.75” converters. A little slushier but good quality. That’s what a 400 hi po would have had anyway. Can be found fairly easily (for external balance as you’ll need).
 
The case interchanges actually..I gutted one saved the back 4 pinion planetary, replaced the front guts and pump put in a bolt in sprag and a transbrake in a 78 lockup case. The lockups do have some heavy duty parts. Never broke it running 10s all stock stuff inside. A lot of work and parts out of a older 727 did fit..lot of work though:eek:
 
If you take the rubber bowl vent seal thats solenoid controlled off on the top of the carb you can run them. Pop the solenoid out pull the rubber stomper off then put the solenoid back in. Or find keyed power for the solenoid. Likely the carb will need to be redone if it hasn't yet, the seals usually are dried up and it will leak internally and run like crap. But they can actually run ok, older ones are a better choice though, and better time spent. There are some differences driving one. But wide open throttle I can't say that there is much difference.
 
Interesting. I too had luck running a 77 T.Q. on a 400. It was a feed back carb but we didn't use computer. It ran GREAT. My only concern, do you get into rich zones and the plugs turn dark and **** mileage. I.D.K.
 
Maybe Ill give it a shot. It was running and in the original car only a few months ago
 
Higher stall means more heat
You may need to add extra cooler
 
There are a couple things you can do to the lean burn tq if you do a search on this site. Like i mentioned...First thing is just pull the little stomper off the solenoid so it runs. I think stock it will run lean. Most just get a earlier carb. Earlier years are great carbs.
 
Curiousyellow71 said:
There are a couple things you can do to the lean burn tq if you do a search on this site. Like i mentioned...First thing is just pull the little stomper off the solenoid so it runs. I think stock it will run lean. Most just get a earlier carb. Earlier years are great carbs.
Click to expand...
If I get keyed power to the solenoid, I can run it as is yes
 
I think that should work but here's no reason to run it. If you pull the rubber stomper off, it will vent the carb like the older TQ. Takes 5 minutes to pull the solenoid off and remove the rubber seal, then put the solenoid back in just to fill the hole. I recall we had one we tried to power the solenoid, but it must have been getting weak or was failing, we ended up removing the round rubber seal and never looked back.
 
I would get a higher stall(and b&m ext balanced flex plate) and run the edelbrock carb until I could find a Holley. :thumbsup:
 
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