Level of difficulty changing 8 3/4 gearing

KIII said

1973 Dart Sport, 340,727, 8 3/4(2070741). My issue is that its geared way to low. The previous owner said he was'nt sure whats in the rear,maybe 3.73? Question#1. How hard is it to change out the rear gears? 1 being an oil change and 10 being an engine swap. #2. How much? #3. Where to purchase? Thanx.

Click to expand...

What is your engine RPM at 60 MPH. Knowing that will give us a good idea of your gears. Mine is 3000 that's with running 3.91 gears and 15" rear tire. As the guys said there are some specialized tools you're going to need but the biggest concern is the lack of gear ratio choices and availablility for the 741 center. This might be a good time to upgrade to the 742 or 489 center and the gear choices are many.