We used dozens of them in dirt trackers with high-HP small blocks and a few big blocks all over central California. It was not uncommon to see massive wheelspin, washboard turns, and repeated full throttle/coast cycles with no damage whatsoever, and all of this with the spider gears welded together so both wheels would hook up equally. Those old 3/4 tons are about as bulletproof as they come, just extremely heavy. We used Muncie 4-speed car transmissions in 2nd. gear against the 4.56 gearset for short tracks that measured 1/4 mile around the outside fence, and 4.10's on "long" 1/4 mile tracks that were measured around the infield perimeter. With a 1.88:1 2nd. gear against a 4.56 rear end, the overall ratio was 8.57:1. The car would come off the turn at about 3,000 RPM, and wind up to 6,500 or 7,000 by the end of the straightaway. On a 25-lap main event, the rear end got at least 50 of those RPM cycles. Counting practice, qualifying, heat races,and the main event, figure on at least 200 full-throttle accelerations and chopped-throttle turns every weekend, all summer! Yep, I think yours will hold up just fine!
Jerry
