I'm not sure if this should be here or in the Diesel section, but anyway... A non-Cruiserhead friend called to tell me he just bought a '79 60 with a diesel 4-cyl and a manual 4-speed transmision. He didn't know the code numbers, and I don't know them, so I can't pass them on to you... but you probably known them, anyway. My friend doesn't go wheeling and he's not a die-hard Toyota Nut (yet), he bought this truck becuase it was dirt cheap and was a one-owner vehicle owned by a friend of his. The other considerations are that he has a 50 mile each way daily commute so he needs to save money on gas, but he has a full-size black lab who comes to work with him every day, so he wanted a vehicle with room. His commute includes a 1200' ascent/decent over a mountain pass. He was wondering if there's a 5-speed, or a 4-speed w overdrive that he could (relatively) easily swap-in. Is there a model that would work? And will it be a good match for his application? What other options does he have? Regearing?