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Discussion Starter #1
I presently have a powerglide with a 1.80 1st gear. Car weighs 3200lb's, 540 reher morrision motor, 33" tall tire. Car only 60' 1.38, I had the motor and trans in a 2650lb car prior and it would 60' 124"s.

Both cars have 4.56 rear gear the 2650 car had a 31" tall tire, the 3200 car has a 33" tire.

Is the car to heavy for a powerglide? Wrong 1st gear? Wrong tire?
 

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Needs more gear. 540 3200 pds 1.38 60ft. Just a guess it probably goes 116 -117 mph 1/8 N/A crossing around 6300.

These are all guesses but if I'm close the converter is slipping 15%. Needs more gear. Or put the 31 tire on it and more gear.
 

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Discussion Starter #11
Needs more gear. 540 3200 pds 1.38 60ft. Just a guess it probably goes 116 -117 mph 1/8 N/A crossing around 6300.

These are all guesses but if I'm close the converter is slipping 15%. Needs more gear. Or put the 31 tire on it and more gear.
114mph, I'll try 31" tires.
 

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142mph 7600rpm
That converter must have a sprag with a stator designed to multiply torque at the higher end of the scale below stall. Like a converter built for 400 pro tree racing because it's not as efficient as typical at the stripe 1/4. Nothing wrong with it, I have one slips a little more but real aggressive at TB release, fast to the shift. This was built specific for 400 pro tree racing.

1/4 mile yours is 14% 7600rpm. The rpm will remain around 7600 because with a shorter the converter will slip a little less.

Good luck
 

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Discussion Starter #16
Sounds loose with the numbers given. Shift rpm? Any idea where the rpm falls to after the shift? have you tried a converter stall test as much as I hate to ask that question?


Hutch
What's a converter stall test?
 

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Discussion Starter #17
That converter must have a sprag with a stator designed to multiply torque at the higher end of the scale below stall. Like a converter built for 400 pro tree racing because it's not as efficient as typical at the stripe 1/4. Nothing wrong with it, I have one slips a little more but real aggressive at TB release, fast to the shift. This was built specific for 400 pro tree racing.

1/4 mile yours is 14% 7600rpm. The rpm will remain around 7600 because with a shorter the converter will slip a little less.

Good luck
So your saying going with a shorter tire (31") my trap rpm will stay the same? Less slippage by the converter?
 

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So your saying going with a shorter tire (31") my trap rpm will stay the same? Less slippage by the converter?
Yes approx.
 
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