I have a 46 cj2a with a buick 225 v6. From what I can tell, it has a SM420 4 speed manual trans with dana 25 front and dana 41 rear axles with 33" BFG's. I do some mild offroading in it but I want to make it a little more streetable. Right now, it screams at me driving 45 mph. I don't even use first gear because it's ridiculously low. I'm not sure how to figure out what gears I have in the axles but I'm curious about which gearing would let me do 50-55 mph without the thing screaming at me. Is there an easy way to figure out my gearing? I assume the axles are stock. I just bought it a few months ago and the previous owner doesn't know anything about it, he bought it as I currently have it. Any help would be appreciated. I'm in the military so I am on a budget until Congress approves bigger pay raises for us. My mechanical skills are very limited but I'm hoping to improve them with this rig.