The stock closed torque tube in 1954-3100's with 3 or 4 speed transmissions was a 3.90. Use the engine rpm/R&P ratio/speed/tire diameter calculator in this forum to lock in on your exact speed. Life is tough (and shortened) on a 235 that spends much time at 3000 rpm. The 235 makes good torque from 1600 up through 2100 with no strain. Hope this helps.


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