Quote: If you don't think 20% slippage is a problem then you haven't been around too many 727 transmissions.
Ron
Not only have I been around them, I gotten paid to build them for 20 years...lol. Slippage factor is figured at full throttle, in direct (high) gear, above the convertor's stall speed. This is because all convertors have a ton of slip below the stall speed. So at light throttle cruise, the fluid in the convertor is not being forced past the vanes as hard, and they will slip like mad. It is a case of wrong convertor, which is really common. But there's not enough heat coming out thru the cooler to heat the radiator and affect engine temp.
Not trying to be a smart azz but did you read the thread...he's taching 3000 rpm at 50 mph. I would think that the converter is not slipping 20% at full lock-up. That must sound reasonable correct ?
I agree with you that the current rad is sufficient.
I'm not saying that my hypothesis is correct....but i have seen it before and the fix was by-passing the radiator.
