The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

lukecp · 01-23-2003, 01:53 PM

To find out your gear ratio, pop off the rearend cover, and divide the number of teeth on the ring gear by the number of teeth on the pinion gear. The fluid proably needs to be changed anyway.

BTW, i'm pretty sure that on the 350 powered 3/4 ton trucks, 4.10 gears came standard. The 307 and 6-cyl trucks came with 4.56 gears. 4.56 were optional though, and your rear axle might have been swapped out sometime in the past.
The 402 big block 3/4 ton trucks usually had a 3.54 gear ratio, which would be much, much better for highway driving.

01-23-2003, 01:53 PM	#7
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	To find out your gear ratio, pop off the rearend cover, and divide the number of teeth on the ring gear by the number of teeth on the pinion gear. The fluid proably needs to be changed anyway. BTW, i'm pretty sure that on the 350 powered 3/4 ton trucks, 4.10 gears came standard. The 307 and 6-cyl trucks came with 4.56 gears. 4.56 were optional though, and your rear axle might have been swapped out sometime in the past. The 402 big block 3/4 ton trucks usually had a 3.54 gear ratio, which would be much, much better for highway driving. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg