The link I posted a few days ago
HERE AGAIN shows a page on my website explaining how to count the "teeth" on a DRIVE GEAR. You and Dan are correct. That is a red DRIVE gear for the main shaft and it has 9 teeth. A blue DRIVE gear has 7 teeth. Chevy T5s came with a red or blue DRIVE GEAR. Nothing else.
The link to TCI you posted is the same web page I use to calculate the correct number of teeth for the DRIVEN gear. You must know the rear tire diameter and the rear axle gear for your application.
Using the formula on the
DRIVEN GEAR CALCULATOR page, your DRIVEN gear should be as follows:
With a 9 tooth red DRIVE gear and a 3.38 axle
22.7 (23 teeth) for a 27" diameter rear tire
21.8 (22 teeth) for a 28" diameter rear tire
21.1 (21 teeth) for a 29" diameter rear tire
With a 7 tooth blue DRIVE gear and 3.38 axle
17.7 (18 teeth) for a 27" diameter rear tire
17.0 (17 teeth) for a 28" diameter rear tire
16.4 (16 teeth) for a 29" diameter rear tire
Now we go shopping for the DRIVEN GEAR and see if vendors actually sell what you need.
FORD T5 DRIVEN gears will NOT work in a Chevy T5!!!
THE GEAR BOX sells DRIVEN gears with 17 teeth through 24 teeth. $18 each
LA SPEEDOMETER GEAR sells 17-22 teeth gears . $9.98 each
Using the calculations I posted, it looks like a RED DRIVE gear will work fine with a 235/75R15 rear tire (28.9" diameter) and 3.38 rear axle. You will need a 21 tooth DRIVEN gear.
Do you have a DRIVEN gear housing?
