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| | | | Joined: Oct 2010 Posts: 202 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 202 | I am needing the proper speedometer gear for a 53 1/2 ton with a 4-speed. I have recently acquired a u-joint assembly to accommodate my 1/2 ton's, with 4-speed, enclosed drive shaft but I still don't have the proper speedo gear that inserts in the side of the transmission as my transmission originated in a 3/4 ton truck. My truck, I believe, has the 4:11 rear gearing.
Does anyone know what the proper tooth count is for the gear that inserts in the side of the transmission so I know what I should be looking for?
Another thought is: does anyone know where I can get the speedometer gears suitable for a 3:54 rear differential gearing?
Your input will be greatly appreciated
Walt Williams
La Verkin, UT
Last edited by 54Belair; 06/10/2011 2:02 PM.
| | | | | Joined: Aug 2006 Posts: 486 'Bolter | | 'Bolter Joined: Aug 2006 Posts: 486 | I can't answer your question but I once saw a chart somewhere on the net that listed all the different speedo gears but I can't find it now. I've been looking for it for a similar problem. Maybe someone has it bookmarked and can share a link.
'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Maybe this will help? However, unless you are lucky enough to obtain the matched set for your drive train (both the drive and driven gears), you'd probably be better off buying an adapter that matches your drive train and tires exactly (as provided by The Speedometer Shop and others). Those of us that have done this have reported results with 1% or less error. | | | | | Joined: Oct 2010 Posts: 202 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 202 | Maybe this will help? However, unless you are lucky enough to obtain the matched set for your drive train (both the drive and driven gears), you'd probably be better off buying an adapter that matches your drive train and tires exactly (as provided by The Speedometer Shop and others). Those of us that have done this have reported results with 1% or less error. The link to the chart shows that I should have 4-12 teeth on my speedometer gears if I am using 6.00-16 tires. I am reading this as the gear that mounts on the yoke should have 4 teeth and the other gear should have 12 teeth. I am interpreting that the 4 yoke gear teeth as having 4 teeth minimum at certain points. (I hope I described that clearly enough.) Not as the tip of one gear tooth, then 2 teeth, then the tip of another gear tooth. I know I can get an adapter from Patrick's Truck. Any thoughts? Walt Williams La Verkin, UT | | | | | Joined: Mar 2007 Posts: 4,215 Moderator | | Moderator Joined: Mar 2007 Posts: 4,215 | I beg to differ on the 12 tooth gear. My 1953 1/2 ton has 13 teeth. It was a bit wore although it still worked. My supplier got me a new gear that he installed, it had 12 teeth and totally mashed up the drive gear. edit, it's a 4 speed SM420
Last edited by 1953 panel; 06/27/2011 3:32 AM.
| | | | | Joined: Dec 2003 Posts: 1,554 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 1,554 | A short cut,go to your local Chevy dealer parts dept.They should have a chart telling you what gear to use. | | | | | Joined: Oct 2010 Posts: 202 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 202 | Which supplier has these new gears?
Walt | | |
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