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school me on converters

eldubb440

eldubb440

more miracles than Jesus
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so I'm putting together a car for my buddy's daughter (68 camaro, not relevant to this topic) and helping him configure his drive line. We are ready to order a narrowed rear. He already has a trans 700R4 (overdrive) ...... so here is my question........

at 55 mph with 28" tires and a 3:91 gear, RPM calculates to 1806 in OD (1:.7)........ at cruising speed, do we not want the converter locked up? so even an 1800 stall is borderline? or just not go into OD until a higher speed? he told me he thinks he has a 2500 stall converter, but not sure. I'm thinking he doesn't, but waiting on confirmation
 
Don't they make performance lock up converters for those?
 
so after some reading, I suppose my question is.......

will a lock up converter "lock up" at cruising speed even if the RPMs are less than the advertised stall speed?

pretty sure I'm almost answering my own question
 
Last edited:
There is a big clutch in there that makes the converter locked,, 1:1
 
RemCharger said:
There is a big clutch in there that makes the converter locked,, 1:1
Click to expand...

I understand, but my question is.... will a 2500 stall converter with lock up, "lock up" when cruising at 2000?

and it may be a silly question as I'm thinking that is the whole purpose of the lock up in the first place
 
eldubb440 said:
I understand, but my question is.... will a 2500 stall converter with lock up, "lock up" when cruising at 2000?

and it may be a silly question as I'm thinking that is the whole purpose of the lock up in the first place
Click to expand...
Yes. Thats the main purpose they invented them. When the old A-999's went bad and the clutch piled up, it would stall the engine when stopping. Like a manual trans car.
The lockup clutch doesn't care what the stall speed is.
 
A lockup converter will lockup, regardless of engine rpm, whenever the electrical circuit is completed, as long as it is in 3rd gear.
 
The big question will be how do you control when the clutch locks and unlocks. And I'm no chevy trans expert.
 
awesome..... google is always full of contradicting info. I prefer to here it from my B body peeps
 
Dipstick said:
A lockup converter will lockup, regardless of engine rpm, whenever the electrical circuit is completed, as long as it is in 3rd gear.
Click to expand...

700r4 is not electronic (to the best of my knowledge; but I have not laid eyes on this particular trans), I believe it is controlled by line pressure or something....I'll look into it
 
Last edited:
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