Need rearend ratio help,1975 K20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**crossy** · 10-19-2003, 07:52 PM

I went and looked at a 75 Chevy K20 today. I could not find the code stampings in the rear axle tube(figures I'm the one always telling people to do that!). The option sheet in the glove box did not list a rearend ratio as an option so that means it is standard ratio for a v-8 truck. I do not have a 75 dealers brochure so anyone that does tell me what they list as standard ratio please. I hope 4.56 like it was in 73. thanx , DAVE

stan79chevy · 10-20-2003, 11:06 AM

mine is a 79 lwb k10 and my original ratio is 3.42 with a th350. the ratio will depend on 2wd 4wd motor and trans combo.
hope that helpes a little

10-19-2003, 07:52 PM	#1
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Need rearend ratio help,1975 K20 I went and looked at a 75 Chevy K20 today. I could not find the code stampings in the rear axle tube(figures I'm the one always telling people to do that!). The option sheet in the glove box did not list a rearend ratio as an option so that means it is standard ratio for a v-8 truck. I do not have a 75 dealers brochure so anyone that does tell me what they list as standard ratio please. I hope 4.56 like it was in 73. thanx , DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

10-20-2003, 11:06 AM	#2
stan79chevy Registered User Join Date: Sep 2003 Location: COVINGTON GEORGIA Posts: 477	mines 3.42 mine is a 79 lwb k10 and my original ratio is 3.42 with a th350. the ratio will depend on 2wd 4wd motor and trans combo. hope that helpes a little __________________ 79 chevy k20 350/350/205/D44/14bFF 4.56 gears rock LWB pimer black 01 S-10 ZR2 extended cab 4.3/4L60E/233 3.73 gear 31" DICK CEPEK CRUSHERS



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