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I have a 150B with a 36% borg warner in it and a 3:78 rear axle. That's way too tall. It came that way, I would never have done it. I can only use it on a downhill run or on the flats with the wind at my back at 65-70 mph, which is too fast. Any slower and the engine lugs. It is a good second gear hill climbing gear though. I think it would be better with a 4:11 rear end. OTOH, I have a 26% with a 3:78 in my SW sedan , which weighs only 50 lbs less than the woodie, and its great.