Source for Spicer 5831 speedometer gears?
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Joined: Oct 2009
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From: West Plains, MO
Source for Spicer 5831 speedometer gears?
This is a long shot, I know... having recently changed my rear gears from 4.56 to 4.10, my ratio adapter is no longer correct. I was going to buy another, but found that the cost for these little adapters has gone up a lot since the early '00's... and it wasn't cheap then.
My current brownie gearset has 3 teeth worm, 14 teeth pinion which requires a 1.5867 step-up to make 1000 cable rpm/60 mph. with the 4.56 gears... Now with the 4.10, I'd need a 1.764 ratio. One place will re-gear my unit for $100.
(which is still considerably cheaper than a new one!)
So I'm wondering if anyone still supplies drive and driven gears for the Spicer 5831B brownie itself... I don't know if there is a set that would be close, but I can't find a table of part numbers and tooth counts. (The 5831 parts manual found online shows some different numbers but not the ratio). Any thoughts?
My current brownie gearset has 3 teeth worm, 14 teeth pinion which requires a 1.5867 step-up to make 1000 cable rpm/60 mph. with the 4.56 gears... Now with the 4.10, I'd need a 1.764 ratio. One place will re-gear my unit for $100.
(which is still considerably cheaper than a new one!)So I'm wondering if anyone still supplies drive and driven gears for the Spicer 5831B brownie itself... I don't know if there is a set that would be close, but I can't find a table of part numbers and tooth counts. (The 5831 parts manual found online shows some different numbers but not the ratio). Any thoughts?
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More Turbo
Joined: Oct 2009
Posts: 596
Likes: 58
From: West Plains, MO
Thanks for that info. But those 9x20 tires are much larger in diameter (517 revs/mile) than my 235/85R16 tires (637 revs/mile).
So the large truck rear gears for the same driveshaft RPM would be 4.10 * (637/517) = 5.05
I don't know what truck my 5831B came out of. Could be GM or some other manufacturer. Either way, the rear gears always jump from 4.88 to at least 5.13. If I got the speedo gears for a 5.13 rear there would be just over a 1% error, which is less than 1 mph at 60 mph.
I assume the columns of part numbers in the picture are drive and driven gear tooth counts? If so, a 4 tooth drive and 17 tooth driven would give almost exactly the ratio I need to keep using my existing ratio adapter, compared to my current 3 & 14.
A more desirable approach would be to eliminate the adapter entirely if I'm going to change speedo gears. 637 * 4.10 = 2612 driveshaft RPM at 60 mph. Speedo needs 1000 rpm. So, 2.612 ratio. 5 tooth drive and 13 tooth driven comes out very close.
Now to find the Spicer p/n for those pairs, so I'm not tied to obsolete Ford parts!
So the large truck rear gears for the same driveshaft RPM would be 4.10 * (637/517) = 5.05
I don't know what truck my 5831B came out of. Could be GM or some other manufacturer. Either way, the rear gears always jump from 4.88 to at least 5.13. If I got the speedo gears for a 5.13 rear there would be just over a 1% error, which is less than 1 mph at 60 mph.
I assume the columns of part numbers in the picture are drive and driven gear tooth counts? If so, a 4 tooth drive and 17 tooth driven would give almost exactly the ratio I need to keep using my existing ratio adapter, compared to my current 3 & 14.
A more desirable approach would be to eliminate the adapter entirely if I'm going to change speedo gears. 637 * 4.10 = 2612 driveshaft RPM at 60 mph. Speedo needs 1000 rpm. So, 2.612 ratio. 5 tooth drive and 13 tooth driven comes out very close.
Now to find the Spicer p/n for those pairs, so I'm not tied to obsolete Ford parts!
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