Rear Gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70short · 11-01-2005, 01:08 PM

I have A "70 SWB" custom. The truck came with the original 4-speed transmission and 350 eng. I recently swapped it out with A TH400. Does anybody know what the original rear end gear ratio is. THANK YOU

Gary

Longhorn Man · 11-01-2005, 05:52 PM

Assuming no modifications...and no options listed on thew SPID label... you should have a 3.73.

I AM assuming you are talking 1/2 ton.... if not....

Assuming no modifications... and no options listed on thew SPID label... you should have a 4.56.

70short · 11-02-2005, 03:17 AM

Thanks Longhorn Man!!!!!!! No modifications 1/2 ton.

Gary

Rod · 11-02-2005, 10:04 AM

I'd say original equip in that v8 4 spd config is 3.07 gears.

Longhorn Man · 11-02-2005, 04:19 PM

mannn, I just looked it up, you ar eright Rod, I had thought that was standard with an automatic and small block...not simply standard with a small block.

70short · 11-02-2005, 05:00 PM

OK so my gears are 3.07's is that correct? No modifications just went from original 4-speed to An auto TH400. THANK YOU

Gary

11-01-2005, 01:08 PM	#1
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	Rear Gears I have A "70 SWB" custom. The truck came with the original 4-speed transmission and 350 eng. I recently swapped it out with A TH400. Does anybody know what the original rear end gear ratio is. THANK YOU Gary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

11-01-2005, 05:52 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Rear Gears Assuming no modifications...and no options listed on thew SPID label... you should have a 3.73. I AM assuming you are talking 1/2 ton.... if not.... Assuming no modifications... and no options listed on thew SPID label... you should have a 4.56.

11-02-2005, 03:17 AM	#3
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	Re: Rear Gears Thanks Longhorn Man!!!!!!! No modifications 1/2 ton. Gary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"

11-02-2005, 10:04 AM	#4
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Rear Gears I'd say original equip in that v8 4 spd config is 3.07 gears. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

11-02-2005, 04:19 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Rear Gears mannn, I just looked it up, you ar eright Rod, I had thought that was standard with an automatic and small block...not simply standard with a small block.

11-02-2005, 05:00 PM	#6
70short Registered User Join Date: Sep 2003 Location: Boise ID Posts: 609	Re: Rear Gears OK so my gears are 3.07's is that correct? No modifications just went from original 4-speed to An auto TH400. THANK YOU Gary __________________ "72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"



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