700r4 converter selection help - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
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post #1 of 4 (permalink) Old Nov 20th, 15, 11:17 AM Thread Starter
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Dave
 
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Location: Chesterland, OH
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700r4 converter selection help

I'm looking for a new torque converter for my car -- Trans is a B&M 700r4 and converter is a B&M 70425, which is supposed to be a Holeshot 3000 w/ lockup. My main issue is that the lockup doesn't work. I verified the wiring and replaced the lockup solenoid inside the trans. I posted about it here, https://www.chevelles.com/forums/showthread.php?t=733746

At this point, I'm ready to replace the converter, since the lockup has never worked for me. I drive the car on the street, but I also like to bracket race it several times a year. I have an external trans cooler mounted in front of the radiator. I can only footbrake the current converter to about 2300, wouldn't mind being able to go a little higher, as long as I can lock it up when street driving.

-Dave

'70 Chevelle ZZ383/700r4/3.55, [email protected] -- Megasquirt2-Extra, Holley Stealthram / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar
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post #2 of 4 (permalink) Old Nov 21st, 15, 12:00 PM
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Re: 700r4 converter selection help

I don't believe the B&M Holeshot 3000 has a lock up. At least part number 70421 doesn't; I could find a 70425.

What I did with my 700 was pick a converter that would be fully stalled at the RPM the engine is turning at typical highway speeds.

Zeke

67 Chevelle
64 Chevelle
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post #3 of 4 (permalink) Old Nov 21st, 15, 5:51 PM Thread Starter
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Dave
 
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Re: 700r4 converter selection help

I'd really rather have a lockup converter, otherwise I'm gonna be stuck with a low stall.

-Dave

'70 Chevelle ZZ383/700r4/3.55, [email protected] -- Megasquirt2-Extra, Holley Stealthram / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar
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post #4 of 4 (permalink) Old Nov 21st, 15, 7:46 PM
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Re: 700r4 converter selection help

The way I understand it, the 700 needs to have a lock up stall in 4th gear to survive, unless internal mods have been made.

What I meant by my comments about cruise speed, is you don't want the stall so high that you aren't fully stalled at your cruise RPM. Because you TC clutch won't last if it's got to lock up under conditions where he turbine and impeller aren't at the same speed. Higher rear gears make this easier of course.

I agree with you, I wouldn't use a non TC converter either.

Zeke

67 Chevelle
64 Chevelle
90 Corvette ZR1
TC# 3094 ACES# 7297
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