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**Mbeef61** · 04-26-2019, 10:59 AM

Numbers on tube might occasionally tell you. Didn’t help me. You can turn the rear wheels and count revolutions of the driveshaft. Best way is to open it and check numbers stamped on ring gear and divide. Numbers on tube could be different unless you are positive it’s stock. Someone could have replaced them with different gears than what is stamped. Also opening allows you to check condition of the gears.

My truck was 71 and i6/3 speed and had 3.73.

04-26-2019, 10:59 AM	#2
Mbeef61 Senior Member Join Date: Jun 2009 Location: Portland - OR Posts: 242	Re: 70 1/2 ton what gear ratio? Numbers on tube might occasionally tell you. Didn’t help me. You can turn the rear wheels and count revolutions of the driveshaft. Best way is to open it and check numbers stamped on ring gear and divide. Numbers on tube could be different unless you are positive it’s stock. Someone could have replaced them with different gears than what is stamped. Also opening allows you to check condition of the gears. My truck was 71 and i6/3 speed and had 3.73.