Phil Martin Posted April 6, 2007 Report Posted April 6, 2007 I just put a 3.21 rearend out of 73 dodge pickup in my B4B. I have 235-75-15 radial tires. Runs and handles great. Now I can BUZZ down the road. Only trouble is I have no idea how fast I am buzzing because speedometer is so far off. Does anyone know if I could put speedometer gear out of any Dodge or Plymouth in my transmission? Quote
grey beard Posted April 6, 2007 Report Posted April 6, 2007 Couple of options here. I have no exerience swapping speedo gears with these Dodge trans, but it was a drop-in on Fords. Another option is to go to a truck parts counter and get a speedo reducer box - just a tad bigger than a padlock - that opens up and lets you change gears inside till you get it right. It goes in series in your speedo cable at either end. Quite easy to use, but don't know what they cost. They're used on larger trucks to correct for wheel/tire/rear ratio variations, and are quite common. JMHO Quote
dmulhall Posted April 7, 2007 Report Posted April 7, 2007 how did your driveshaft match up? how much modifying did you have to do? Thanks, Dave Mulhall Quote
Phil Martin Posted April 7, 2007 Author Report Posted April 7, 2007 Only had to move the spring mounts a little. Rearend I got didn't have brake drums so I bought new drums, wheel cylinders and return spring set. Have about $150 in it. brakes are bigger and easier to adjust. Universal was same size. Quote
MBF Posted April 9, 2007 Report Posted April 9, 2007 Has anyone swapped in a full floating rear to replace the 6 bolt 3/4 & 1 ton factory rear? What fit, and what needed to be done. Cruising at 42 mph tends to p1ZZ off the folks behind you! Mike Quote
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