I have put an MB OM617 with a Jeep AX-15 in my Ford Ranger.

The AX-15 came with an electronic speedometer output, and the Ford uses a mechanical cable. I talked with a guy at a speedometer shop. I told him it has a 3.47 rear gear ratio, running 215 70R/14 tires. According to 1010 Tire they are 25.85 inches tall.

He told me I would need a 35 tooth output gear, with a long shaft, and the cover plate.

I found one on ebay, and installed it. According to my gps unit, it is 3 mph off at 60, and 4 mph off at 70. I trust my gps as it is accurate on the other 2 vehicles we own.

I need to clarify: The truck speedometer says 60, the gps says only 57. When the truck speedometer reads 70, the gps says 66, so I am reading faster than actual. What do I need to get, a gear with more teeth, or fewer teeth to slow it down?

Thanks.

Rick

I'd call it close enough. Lots of vehicles are no closer than that from the factory.

Buy one size taller tires next time and be sweet!

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Thanks for the input. Maybe I will just wait and get bigger tires next time.

Rick