Lockup 904

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ed1946

ed1946

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Is it true I can put a lockup converter 904 behind my 5.9 magnum. If so, what converter would work.
 
I had Rich from Winners Choice Transmission Parts build a torque converter for me. Give them a call 800-374-3436 and get his opinion.
 
You would need a neutral balanced lockup converter.
You will need to elongate 1 of the mounting holes on the magnum flex plate, does not matter which one, for the converter to bolt up.
 
Its not just the convertor. Transmission has a different valve body and it has ports to pressurize the clutch in the convertor. No, you cant modify a non lockup to be a lockup.
Those transmissions are a dime a dozen. Maybe a quarter.
 
ed1946 said:
How about a brand new 904
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How about a new one? A 904 lock up trans has to be just that. They came out in late 80's Mopars like Chrysler 5th. Avenues and Dodge Diplomats. (M Bodies)
 
crewchief said:
I had Rich from Winners Choice Transmission Parts build a torque converter for me. Give them a call 800-374-3436 and get his opinion.
Click to expand...
I called, they no longer do torque converters. Another question, what does neutral balanced mean, no weights?
 
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Is a loc-up necessary? at 65mph one might be good for 100rpm, maybe a bit more, or less, depending on how hard the engine has to work to propel the chassis/bodystyle. Occasionally, with a particular combo, a car might get worse fuel-economy at the lower rpm.
And then there is the cost of the swap versus the fuel-dollars saved and how many miles to break-even.
And finally, how much power can the loc-up handle.
 
AJ/FormS said:
Is a loc-up necessary? at 65mph one might be good for 100rpm, maybe a bit more, or less, depending on how hard the engine has to work to propel the chassis/bodystyle. Occasionally, with a particular combo, a car might get worse fuel-economy at the lower rpm.
And then there is the cost of the swap versus the fuel-dollars saved and how many miles to break-even.
And finally, how much power can the loc-up handle.
Click to expand...
Went with a regular 904.
 
I went with a 999 lockup in my 67 coupe. I calculated 70 MPH @ 2400 RPM with my 3.73:1 gears and my tires and GV overdrive. I didn't want to give up the converter slip and my theory worked.
Not large on black stripe burnouts but from 5 MPH hold on to your coffee cup and be ready to shift very quickly!
 
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