I have a 69' with original F and 3 on the tree. I have recently lifted it with BDS 4" and put 33s on it. It drives fine around Denver but the instant I hit a hill it simply doesnt have the power. I am assuming it has the stock 4:11's in it. So what should I do? Get new gears in the difs, get a 4 or 5 speed transmision, or do I have to go v8? I dont want to go 80 as some others, simply be able to drive into the mountains without pissing off all the other drivers behind me. Thanks all.