So I got tired of looking for information everywhere across the web, and decided to consolidate what I could find. Attached is an excel spreadsheet that will determine the correct driven gear if you input the tire size, drive gear, and axle ratio. All currently known GM gears and sleeves are also listed by part number and color and sleeves are referenced to which driven gears they will work with.
Enjoy,
Dave

Ok, it won't allow me to upload excel files. You can get it here...
http://uploaded.to/?id=ianzfh

 

Ok, updated the file to include the part numbers for the retainer and o ring seal, as well as a new 20 tooth drive gear.

http://uploaded.to/?id=5jewdy

 

Now if you can include information for T-5 speedometer gears on sheet 2, it would be complete.

 

Here's what I could get from Tremec. I don't reel like cross referencing the p/n's right now, so they are all tremec part numbers.

1351 110 002 SPEEDO GEAR, PURPLE 7T
1351 110 002 SPEEDO GEAR, NATURAL 7T
1353 110 003 SPEEDO GEAR, RED 9T
1353 110 004 SPEEDO GEAR, BLACK 6T
1353 110 005 SPEEDO GEAR, YELLOW 7T
1353 110 006 SPEEDO GEAR, BROWN 7T
1353 110 008 SPEEDO GEAR, ORANGE 7T
1353 110 010 SPEEDO GEAR, NYLON 21T, DRIVEN
1353 110 011 SPEEDO GEAR, AQUA 8T
1353 110 017 SPEEDO GEAR, PINK 20T, DRIVEN
1353 110 018 SPEEDO GEAR, 12T, ELECTRIC

 

Can you explain what the sleeve is? I have a 89 Firebird formula with the electric VSS sensor and am trying to get the right part numbers for the gears to make my speedo correct. Tires are stock 245/50/16 and the rear gear is a 3.27. The original gear was a 2.73 so I assume the drive gear is a 17 red.
I also have a 88 Iroc but it has a speedo cable and I know there is a difference in the drive/driven gears in style. Can you explain? Where cani get the gears? I work at a Chevy store and most of the gears are discontinued.

Thanks, Mark

 

http://www.transmissioncenter.net/sp...n_______va.htm

They have the gears you need. Scroll down. Yes, the vss uses a different sleeve, but it's almost always the same idea. If you take off the vss (that is to say the sleeve, but for an electric speed) and notice that instead of a drive gear you have a metal ring with ridges on it, you have an inductive setup and need to call up the guys at www.jagsthatrun.com

 

Thanks for the information on the Raptor site. I am glad someone out there supports this stuff. All I need to do is pull out the VSS and see what I have to work with.