gear ratios - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Johns70 · 08-25-2005, 11:38 AM

what gear ratios usally came with the small block v-8 granny low 4-speed combos? i have a 70 parts truck with a good rear end and the glove box says limited slip.so i was just wondering if it might be a 3.08 ratio or if it would be more like a 3.73. i quess i don't want to lay out in the dirt and pull the cover.
thanks john

llegos · 08-25-2005, 12:27 PM

the stock is 3.73 i believe, but you could have up to 4.10's. but if you had 4.10s i think it would say on the sticker in teh glove box

Johns70 · 08-25-2005, 02:23 PM

thanks for the info,igot off my lazy you know what and took the cover off and fopund a posi plus 3.08 gears.

Longhorn Man · 08-25-2005, 05:14 PM

your gear set was chainged later on. 3.73 is standard with the 4 speed, and the option list would have mentioned 3.07 gears if so optioned. Also the fact that you could not get 3.07 with posi also confirms yours is not stock. (esp if you actually have a 3.08....that was never offered in the trucks of this generation)

Johns70 · 08-25-2005, 05:25 PM

i'll have to go look at it again to make sure thats what it is. it says 14.43 on the ring gear?

Johns70 · 08-25-2005, 05:33 PM

went out and looked again and thats whats in it. the numbers on the ring gear are
3817779 14:43 gm 06-69 and on the glove box door it lists g80 positrac rear axle.
i looked for the build sheet but i couldn't find it under the seat springs.

Longhorn Man · 08-25-2005, 05:58 PM

Hmmmm.......interesting.

08-25-2005, 11:38 AM	#1
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	gear ratios what gear ratios usally came with the small block v-8 granny low 4-speed combos? i have a 70 parts truck with a good rear end and the glove box says limited slip.so i was just wondering if it might be a 3.08 ratio or if it would be more like a 3.73. i quess i don't want to lay out in the dirt and pull the cover. thanks john __________________ 69 chevy short wide box project 70 GMC jimmy project

08-25-2005, 12:27 PM	#2
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	the stock is 3.73 i believe, but you could have up to 4.10's. but if you had 4.10s i think it would say on the sticker in teh glove box __________________ -Steve

08-25-2005, 02:23 PM	#3
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	thanks for the info,igot off my lazy you know what and took the cover off and fopund a posi plus 3.08 gears. __________________ 69 chevy short wide box project 70 GMC jimmy project Last edited by Johns70; 08-25-2005 at 04:19 PM.

08-25-2005, 05:25 PM	#5
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	i'll have to go look at it again to make sure thats what it is. it says 14.43 on the ring gear? __________________ 69 chevy short wide box project 70 GMC jimmy project

08-25-2005, 05:33 PM	#6
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	went out and looked again and thats whats in it. the numbers on the ring gear are 3817779 14:43 gm 06-69 and on the glove box door it lists g80 positrac rear axle. i looked for the build sheet but i couldn't find it under the seat springs. __________________ 69 chevy short wide box project 70 GMC jimmy project

08-25-2005, 05:14 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	your gear set was chainged later on. 3.73 is standard with the 4 speed, and the option list would have mentioned 3.07 gears if so optioned. Also the fact that you could not get 3.07 with posi also confirms yours is not stock. (esp if you actually have a 3.08....that was never offered in the trucks of this generation)

08-25-2005, 05:58 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Hmmmm.......interesting.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.