a hot cam and too high a gear especially w/od dont work well if you like to just lug around, they need to many rpms.have a rdst pu now w/columbia w/4.44 gears,26 tooth linc. trans,7-00 16 tires, mild 53 merc eng can ride 40 -45 in hi/od ,no bucking. had 34 2dr hoter flthd eng,3.78 columbia od, 26 tooth linc gears orig 17 in tires ,was a dog ,needed tomany rpms. have 2 model A's w/borg warner od, one has 4.11 gears other has 3.78 gears, had to put on 16 in tires to gear it down to be able to use the od. put a 83 ford truck 4sp od in my 34 cabro w/3.00 rr &28in tires, stock 302 eng, not on road yet????, have 34 rdst w/331 cad eng, t-85 ford 3spd od, 4.11 9'' rr, not finished????, also a 27 T stock 21 std flthd, 39 linc box w/48 ford gears [used up all my 4 sets of linc gears], columbia od w/4.11 grs,31'' tires????? LOVE OVERDRIVES, gearing for the way you drive and engine are important to be happy w/perfermance.also had a 40 chassis w/mild flthd ,25 toothlinc grs,columbia od w4.44 grs 29'' tirs, sold it, new owner said it ran great