The Stovebolt Site Forums The Shop Area Driveline looking for speedometer gear set drive and pinion for SM420

hi guys gears are worn on mine and the speedo is not working


i did a search but couldnt find any suppliers

does anyone have a set for sale?


dont care what ratio is i just need to get something

please send me a pm if you have a set or know of a supplier

thanks!
mike

Do you ever check eBay?

Which gear you need? Drive gear or driven gear?

PM sent

thanks guys

i need both driven and drive gears

to pass vehicle inpection in japan i need a working speedometer for rolling road speedometer test... just found out

ive been using a gps speedo up to now

are all the drive gears the same and only the driven gear needs to be changed to adjust speedometer? what i mean is will any driven gear work albeit wrong speed indicated with the original drive gear.

my driven gear has 13 teeth and looks like

http://drmike.smugmug.com/Other/Truck/i-2MXVVq6/A

cant recall what the drive gear is yet as have to take it out but do remember its badly missing some teeth so needs replacing

1/2 ton 1949 4 speed


I have access to a 15 teeth driven gear and a 4 teeth drive gear....will they work together? i dont care if the speed is wrong (i have to convert to km/h anyway) i just need a moving needle

My thoughts are they will work. I'd say if you are getting them from the same person, they most likely are a matched set out of the same transmission.

hi,

they arent from the same source unfortunately so not sure

btw how do you guys usually take off the drive gear? any tricks

1. The drive/driven gears are a matched set - matched to RPM-affecting features of the truck (rear-end-ratio and rear-tire diameter).

2. However, (I think) some sets of drive/driven gears might contain one gear that is shared with another set.

I dimly recall someone posting a gear-set parts list that showed part numbers for different combinations (I will try a search, but the info might have been posted in another discussion board).

I think the drive can be carefully punched/pressed off the forward yoke for the u-joint (I have only done it once - for my 1954 Suburban).

added later - not the charts I referred-to above: Master Parts Catalog: Group 4.337 (and more parts in 3.338)