what gears were standard in 71'? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 08-12-2002, 08:02 AM

What were the standard gears in a 71' with a 12 bolt rear?. They feel like 3:07. Also I tried to rotate the wheel and count the rev's on the driveshaft but only turned 1.5 times.

RodC · 08-12-2002, 08:44 AM

Should be 3.73 Should be an option listed in the glove box if it is other than 3.73

Blazer1970 · 08-12-2002, 08:44 AM

3.07 for trucks with 350s. 3.73 for 6 cylinders and 307s.

JimKshortstep4x4 · 08-12-2002, 08:47 AM

The automatic transmission equipped V8 trucks had 3:07 gears in them as standard equipment.

Jim

Rod · 08-12-2002, 04:33 PM

3.07 gears with a v8 if 2wd truck.

Longhorn Man · 08-12-2002, 05:36 PM

Pop the cover off and count the teeth.
How long has that oil been in there? 10...20...maybe 30 years?

DennyB · 08-12-2002, 08:32 PM

Quote:

Originally posted by 70c10
What were the standard gears in a 71' with a 12 bolt rear?. They feel like 3:07. Also I tried to rotate the wheel and count the rev's on the driveshaft but only turned 1.5 times.

With an open rear with one wheel jackedup you have to multiply by 2.
1.5 x2 =3.00
real close to a 3.07

08-12-2002, 08:02 AM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	what gears were standard in 71'? What were the standard gears in a 71' with a 12 bolt rear?. They feel like 3:07. Also I tried to rotate the wheel and count the rev's on the driveshaft but only turned 1.5 times. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-12-2002, 08:44 AM	#2
RodC Registered User Join Date: Nov 2001 Location: Fairmont WV Posts: 304	Should be 3.73 Should be an option listed in the glove box if it is other than 3.73 __________________ Rod Childers '71 C10 Stepside

08-12-2002, 08:44 AM	#3
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	3.07 for trucks with 350s. 3.73 for 6 cylinders and 307s. __________________ Tim

08-12-2002, 04:33 PM	#5
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	3.07 gears with a v8 if 2wd truck. __________________ 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.

08-12-2002, 08:47 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The automatic transmission equipped V8 trucks had 3:07 gears in them as standard equipment. Jim

08-12-2002, 05:36 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Pop the cover off and count the teeth. How long has that oil been in there? 10...20...maybe 30 years?



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