3B, thank you for looking those up. Crossing those ring gear numbers online gives the following
3702454 changed to 3991408: 168 teeth
3737920 changed to 3991409: 197 teeth
The 3737920, 3991409 numbers cross to a Pioneer part number FRG197B
For what it’s worth my truck has a 292 six cylinder with the 197 teeth ring gear. I mention this in case others come across the same scenario. Thanks again for the help.
