Changing speedo gear for Borg warner overdrive. Please give advice

[steveo3318]

Ok so I finally scored a new old stock in the box gm solenoid with the rare 1.5 inch shaft yesterday. Needless to say it was almost as much as the whole overdrive saginaw three speed.

So here's my question. I am about to put it all together and put it in my truck but my truck has 3.73s not the regular 4.10s that these overdrives came with. I don't want to change my gears but I do want my speedo to be correct. Can I use my 373 speedo cable gear and it not destroy the plastic. Or do I need to use the 410 and deal with the speedo being wrong? The main shaft metal gear is metal and cannot be changed as it runs the governor gear as well and it's metal.