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I have the 216/220 cam in the silvy along with the circle-d converter mentioned abouve but its stalled at 2400-2600...With 5k behind the truck it'll flash to 3k easy..Id be leary of towing 4k with a 3200 stall..JMHO tho
Chris said it's ok... just be easy on it. I use mine to haul scrap metal on occassion and I've gone past the 4k by a few hundred pounds.
I'm also running the 40k cooler and the trans never got over 140... it's only a 10 mile drive to the scrap yard.