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Does anyone happen to know or can you find out what the tooth count is for the speedometer driven gear in a TH350. The truck it came from is a 1975 C10. Even the tooth count for the drive gear would work. I just need to figure this out because I can't find my old one.
Thanks!
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It really depends on your rearend ratio:
73-87.com/7387garage/driv...speedo.htm
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project
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True... It's 3.73 in my truck (stock from the factory). I don't know what the original tire size was, but it came with 16" wheels. I do know that I'm running slightly larger tires (265/75-R16) and the speedo always used to be off by a bit. If I could figure out what the drive gear is, I could get the appropriate driven gear. If I could figure out what the stock driven gear was, I could figure out what it should be.
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chevelleengineer.home.com...speedo.htm
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I've got about four different sources with the same info on how to calculate the speedometer driven or drive gear now. What I don't know is the tooth count of either one. Can anyone help??
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75, have you seen this site? You'll notice that the 3.73 ratio has a bunch of combinations- depending on your tire size. Measure the tire diameter to get started. Lots of info. Hope it helps. BTW, isn't your drive gear still on the transmission output shaft?
www.transmissioncenter.net/speedometer_calibration_______va.htm Don St.Clair
Culleoka Tn
Edited by: DnStClr at: 3/13/07 11:26 am
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What color is the drive gear? There is a lot of info about the gear colors and tooth count on the net.
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I hadn't thought about figuring it out by the color of the drive gear! I forgot those were color coded too. I kept trying to think about how I was going to count the teeth on it if I couldn't figure something else out. I'm not sure where my driven gear or the housing went...
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I have seen that PATC site. I even have a heavily built 700R4 Raptor trans that I put in my truck for a while. I'm putting the TH350 back in instead so I can sell the truck and hang on to the 700R4 trans to either sell seperately or put in another project.
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Know whatcha mean. I bought a TH400 from them and it's sitting on my garage floor still on the pallet after 2 years! I rethought my plans and now want to put in an OD trans like you have.
Don St.Clair
Culleoka Tn
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It's an impressive transmission, that's for sure. It's somewhere between the top and second to top of their line. I only ran it for about 3000 miles (about a year). My truck is mostly a dirtbike hauler, so it doesn't see a ton of miles. If you're interested, it's basically brand new. I don't know what I'd have to do to ship it though. I paid somewhere north of $2k for it, but I'd let it go for $1500.
BTW... The drive gear in my TH350 is green and I FOUND my driven gear! It's red! Thanks for the help though guys!
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I already have the 700R4. The Raptor you have is a good one tho!
Don St.Clair
Culleoka Tn