gearing question

[lightening26]

We switched from power glide with converter to falcon and coupler. Wondering if we would need to change the rear gear to keep the same rpms. Thanks in advance.

[Mod77L]

I gained around 2-300 RPM when I made the switch. I geared one size higher (numerically - smaller number) and it brought the RPM back to where it was. I think the change was due to the motor winding up more quickly off of the corner, so I had more RPM at the end of the straight.