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I have a 70 chevelle drag car 468 power glide with 1:89 1st, 4:88 rear .Its run a best of [email protected] ,[email protected] think the converter is to loose; it stalls 6200 against the brake. I have checked the tach calibration but the guys at hughes say it can't stall that much with my combo. Another A-1 converter was similiarly loose.Checked the trans converter charge circuit last teardown, was ok.Anyway, they said it should be about 5000.i think i'm going to have it tightened 500 and try it.Cam is 272/278/112. Ideas?
 

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What is your percent slip on the top end going through the traps ?

Easy to calculate if you have tire diameter, rear gear, mph, rpm using one of tci race calculators.

Assuming a 32 inch tall tire works out to about 15 percent for 135 mph, 8000 rpm and 4:88 gears.

29 inch tall tire gives 5 percent.
 

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I think more than 10 percent is too much, and 15+ is for sure too much

Think you should be under 10 anyway.
 

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Before you hit the converter. I would try another tach in the car. I had an autometer years ago that showed 5500 at 4000 rpm and crossed over 8000 with 4.88 gears at 130 mph. After trying a new tach all was right on. My chevelle is 4.88 gear with 16x32 tires and I cross at 7600 at 141.4 mph. I would think you would definitely need a little more stall to get it moving because of the 1st gear in the trans, but 6200 is a little high. I have mine stall at 5500 but I have a 2.48 first gear with the t-400. Mine also weighs 3150 with me in it.
 
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