you can typically get a ford 9' rear end pretty cheap. 3.73 gears, Limited slip differential, disk brakes. and ford threw it under nearly every solid axle vehicle for a long time. low milage units typically only go for about $200


2000 Nissan Frontier, 3.3L (sold)
2006 Chevy Cobalt SS, 2.4L
1952 Chevy 1/2 pickup, 235 c.i. I6
when life speeds up, downshift