Can someone tell me what colour & # teeth the speedo drive gear is for my GS with the following info from the build sheet/gm documents and the part# on the seal& sleeve speed gear is 1362285 according to the parts book 3.08 rear gear G78x14 orig tire size th350 My unit is leaking where the speedo cable attaches to the "bullet". The small seal is probably defective as could also be the shaft. I removed the unit from the tranny & replaced the large o-ring as it had deteriorated & leaked. I got a used small seal for the speed shaft & i know the shaft was also marked. So it is now leaking. tkx
Green 42 tooth DRIVEN gear ( 1362049), ONLY IF your transmission is the same one the car left the factory with (numbers matching) This info right out of the 1972 Buick Chassis Manual, page 40-90. Working backward with the formula, https://www.tciauto.com/speedometer-gear-calculator G78-14 is 27.06" tall 3.08 rear gear 42 tooth DRIVEN gear The DRIVE gear would have been 18 teeth( Blue) on the ORIGINAL transmission.
If anybody needs those gears,I have a few NOS still in stock.Gerry would have first choice,if he needs anything.Bruno.
I had the speedo gear out of the tranny, as I stated above but I could not remember the colour of the gear. I guess that I will have to crawl under the car to verify the part#, as per the master parts book, of the "bullet", then remove the bullet and verify gear colour. I am certain that I will need the gear as it was marked (will let u know Bruno). I also require the outer seal (orange in colour ?) - anyone have a source?. I really do not want to have to purchase the whole bullet, but if I have to I will. When I verify everything, I will let u guys know. I do know that different bullets use different gear shat diameters. Again, thx for all the help.
https://www.classictransmissionsolu...-gear-housing-leak-stop-seal-kit-speedometer/ Gerry, look around, I found seal kits with a simple Google search.
