Standard gear ratio? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hiway · 12-02-2007, 05:31 PM

1984 Jimmy, 305 w/700r. What was the standard axle ratio in these?

Plumbnutz · 12-03-2007, 11:07 AM

RPO code on the sticker in glovebox should answer this, unless the axles have been re-geared or swapped. I can't remember where I saw this listings for the different codes.

Plumbnutz · 12-03-2007, 11:10 AM

Here's one

Chuck's Chevy Truck Pages

hiway · 12-03-2007, 03:07 PM

Hey, thanks for the list! I've never heard of 3:21's and also noticed no 3:42's on there. I'm guessing I have 3:08's but not sure and not ready to pull the covers yet.

tobiahr · 12-05-2007, 03:59 PM

you dont have to pull the cover. simply raise both rear wheels off the ground turn them one full rotation and watch how many times the driveshaft turns. that is the ratio. if you mark the tire and driveshaft with white chalk it makes it easier.

12-02-2007, 05:31 PM	#1
hiway Mad Scientist Join Date: Jul 2005 Location: Enola Arkansas Posts: 380	Standard gear ratio? 1984 Jimmy, 305 w/700r. What was the standard axle ratio in these? __________________ Everythang relates to Beer! 86 1/2ton on tons! sbc/465/208/D60/14/35's 81 Postal....with 468 bbc 97 Merc Marq comuter 07 Suburban 02 Danger Ranger

12-03-2007, 11:07 AM	#2
Plumbnutz Registered User Join Date: Nov 2007 Location: Oregon Posts: 21	Re: Standard gear ratio? RPO code on the sticker in glovebox should answer this, unless the axles have been re-geared or swapped. I can't remember where I saw this listings for the different codes. __________________ 74 K5 Blazer-built 350ci,Turbo 350, NP 205 8 lug Dana 44, GM Corp 14 bolt-4.56 gears, 37" Boggers 89 K5 Blazer-TBI 350, 700r4, NP 208 8 lug Dana 44, GM Corp 14 bolt-4.10 gears, 33" Toyo A/T Last edited by Plumbnutz; 12-03-2007 at 11:08 AM.

12-03-2007, 11:10 AM	#3
Plumbnutz Registered User Join Date: Nov 2007 Location: Oregon Posts: 21	Re: Standard gear ratio? Here's one Chuck's Chevy Truck Pages __________________ 74 K5 Blazer-built 350ci,Turbo 350, NP 205 8 lug Dana 44, GM Corp 14 bolt-4.56 gears, 37" Boggers 89 K5 Blazer-TBI 350, 700r4, NP 208 8 lug Dana 44, GM Corp 14 bolt-4.10 gears, 33" Toyo A/T

12-03-2007, 03:07 PM	#4
hiway Mad Scientist Join Date: Jul 2005 Location: Enola Arkansas Posts: 380	Re: Standard gear ratio? Hey, thanks for the list! I've never heard of 3:21's and also noticed no 3:42's on there. I'm guessing I have 3:08's but not sure and not ready to pull the covers yet. __________________ Everythang relates to Beer! 86 1/2ton on tons! sbc/465/208/D60/14/35's 81 Postal....with 468 bbc 97 Merc Marq comuter 07 Suburban 02 Danger Ranger

12-05-2007, 03:59 PM	#5
tobiahr Registered User Join Date: Nov 2007 Location: Lincoln NE Posts: 513	Re: Standard gear ratio? you dont have to pull the cover. simply raise both rear wheels off the ground turn them one full rotation and watch how many times the driveshaft turns. that is the ratio. if you mark the tire and driveshaft with white chalk it makes it easier.

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