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Hope someone can help. Have a 1968 Dart 340 with 727, 8 3/4 with 323 posi.When trans downshifts under WOT into 1st it automatically shifts to 2nd and the motor boggs down. How can I get it to stay in 1st longer? Adjusting the carb rod will increase shift point but only under normal driving...

Can anyone tell me if you have to remove the thrust block on the shaft in a 8 3/4 posi, if replacing the tappered bearings with the green roller style axle bearings? I've had some people say yes and some say no. Thanks