Aftermarket gears?
Swinger 340, I hate to say it but I know that scenario real well. It took me about 5 years after I switched the 66 Dart from an auto to a manual trans, that I was going in the wrong direction with the clutch. Axle, sure grips, rear axle gears, driveshafts, and clutches, I broke it all. Switched to a Soft-Loc clutch and haven't broke a driveline part in at least 12 years since and picked up well over a 1/2 second in ET's
Swinger 340, I hate to say it but I know that scenario real well. It took me about 5 years after I switched the 66 Dart from an auto to a manual trans, that I was going in the wrong direction with the clutch. Axle, sure grips, rear axle gears, driveshafts, and clutches, I broke it all. Switched to a Soft-Loc clutch and haven't broke a driveline part in at least 12 years since and picked up well over a 1/2 second in ET's