Quote:
Originally Posted by LMJD
Sounds like the 2 speed rear end is your best and easiest fix if you find one that fits. As far as the speedo, 2 speeds come with a speedometer shift adapter which screws on the back of the speedo head then the stock speedo cable screws into it.
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Diddo. My C750 was a good swap. They changed out the entire cable and the 'adapter' was on the frame rail. Granted, it still might be off depending on the calibration and original axle ratio vs the 'low' ratio on the two speed.
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1999 E-350 Cub Wagon, 7.3L Power Stroke, E4OD, 3.55 
1990 E-350 Club Wagon, 7.3L IDI, E4OD, 3.54LS
1983 F-150 2x4, 4.9L, C-6 w/GV-OD, 3.55 Farm pickup
1981 C-8000, 3208 CAT, RT-6510, Rockwell SSHD Tandems (Swap)
1977 K100C, NTC-350, RT-1110, Tandem
1977 Transtar II, NTC-290, RT-9509 Single
1977 Transtar II, Formula 290, RT0-9513, Tandem
1974 C-750, 391CID, Clark 5 speed, Eaton 2 speed
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