I am restoring a Ford 1949 F1 Pickup. I have dropped a 302CI engine & AOD transmission from a 1985 Lincoln Continental into it. I have also installed a rear end from a Ford Granada. The rear end tag reads:
WER V 5MC
2 75 8 7 575B
I'm assuming the gear ratio is 2.75:1. Is the ring gear an 8" or a 8.7"?
Also I am uncertain of the year of build. I believe with an automatic overdrive transmission, I need to consider swapping the gears for a 3.73 or 4.11 ratio.
Since I'm not sure of the year of the vehicle, I was hoping to pin it down from the info on the tag. You mentioned a 10 bolt year for the 7.5". Is the 7.5" the only year to have the bolt on rear cover? I have a 10 bolt rear cover that is basically square with rounded corners.
There are many axles with a bolt-on rear cover, including the VERY common 8.8" & several Danas.
Gear selection isn't based only on the trans; you also have to consider the tire size & the engine RPM you want at a particular speed. So it involves everything from the engine to the ground. There are several gear calculators throughout the web - do some Googling.