Hi everyone,

brand new to the forum, but I've browsed lots before. Just retired my 1990 f250 with the 7.3 non-turbo diesel, and bought a 1994.5 f250 4X4 with the turbo diesel.

Axle code is 35, which I think means 4:10 gear ratio rear end. Trans. is 5-speed manual. Tires are wider than the stock recommended size, but are the same diameter (I measured). shouldn't affect speedometer/engine speed ratio, anyway, just ground speed.

Cruising RPMs at 100 km/hour (what's that, about 62 MPH?) in overdrive is close to 2500 RPM. To me, this seems high for a big turbo diesel. I was expecting it closer to 2000... maybe 2200 tops.

Do these numbers match what's expected for 4:10 gear ratio? Or did someone put a slow rear end in there at some point (there's been a few owners). I may think about gearing it higher, but I need to know where I'm starting from first!

Thanks very much and thanks also for keeping up this forum. I learn tons every time I visit.

Scott