stock rear ratio - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70cst10 · 06-08-2002, 11:20 PM

I'm just curious about the rear end in my trucks.. I have two '70 half tons.. One is a longbed that came with a 350/t350, and the other was a 307/3spd manual. Neither have a ratio on the option sheet. Would it be safe to assume they are both peg-legged 3.73s? I also have a 68 with a 250/3spd that I know for a fact has a 3.73. I know the best way to check is to pop the rear end cover and count the teeth, but I would like to know what to expect. Thanks.

71Chev · 06-08-2002, 11:31 PM

Look on top the passenger side axle tube for a 3 letter code stamped into the tube. Then post the codes.

Longhorn Man · 06-08-2002, 11:38 PM

I'll say the 350/350 is a 3.07...not sure about teh stick truck.
The oil needs chainged in there anyways.

72sleeper · 06-08-2002, 11:49 PM

a 72 1/2 ton 2wheel drive lngbed wth a 307/350 turbo (auto) with the stok rearend???

Longhorn Man · 06-09-2002, 12:04 AM

If not mistaken,(And someone please correct me if I am mistaken) all small block automatic 1/2 ton trucks came with 3.07's as base equipment.

conman · 06-09-2002, 07:32 AM

I believe if you raise one wheel and mark the yoke, then turn the wheel (tire) two full turns while your counting the revolutions on the yoke that'll give you ratio. If the yoke turns just over 3 times it's a 3.07, if 3 3/4 it's a 3.73 and so on.

slam33 · 06-09-2002, 11:52 AM

longhornmail is right. The factory spec the 350/350 with a 3.07 as standard

06-08-2002, 11:20 PM	#1
70cst10 Senior Member Join Date: Jun 2001 Location: Gaston, SC Posts: 580	stock rear ratio I'm just curious about the rear end in my trucks.. I have two '70 half tons.. One is a longbed that came with a 350/t350, and the other was a 307/3spd manual. Neither have a ratio on the option sheet. Would it be safe to assume they are both peg-legged 3.73s? I also have a 68 with a 250/3spd that I know for a fact has a 3.73. I know the best way to check is to pop the rear end cover and count the teeth, but I would like to know what to expect. Thanks. __________________ Milan 1964 Chevelle SS 283/M20

06-08-2002, 11:31 PM	#2
71Chev Senior Member Join Date: Dec 2000 Location: Indiana Posts: 3,074	Look on top the passenger side axle tube for a 3 letter code stamped into the tube. Then post the codes. __________________ 71 Chevy CST Long Fleet 350/350/3.07 leaf rear.

06-08-2002, 11:49 PM	#4
72sleeper []D [] []v[] []D Join Date: Dec 2001 Location: h'vegas,TN,USA Posts: 78	what about a 72 1/2 ton 2wheel drive lngbed wth a 307/350 turbo (auto) with the stok rearend??? __________________ Clint 72 c'10 350ci/400hp sleeper forever

06-09-2002, 07:32 AM	#6
conman Registered User Join Date: Jan 2002 Location: Fayette, Alabama Posts: 155	I believe if you raise one wheel and mark the yoke, then turn the wheel (tire) two full turns while your counting the revolutions on the yoke that'll give you ratio. If the yoke turns just over 3 times it's a 3.07, if 3 3/4 it's a 3.73 and so on. __________________ Fayette Alabama

06-09-2002, 11:52 AM	#7
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	longhornmail is right. The factory spec the 350/350 with a 3.07 as standard __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

06-08-2002, 11:38 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I'll say the 350/350 is a 3.07...not sure about teh stick truck. The oil needs chainged in there anyways.

06-09-2002, 12:04 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	If not mistaken,(And someone please correct me if I am mistaken) all small block automatic 1/2 ton trucks came with 3.07's as base equipment.



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