Need opinions on differential brands/ratios - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mountain Man · 05-23-2002, 05:10 PM

I need to swap the factory 4.57 posi out of my 67 1/2 ton. I am reving 4,000 at 60mph!

I am thinking of going with 3.42 auburn posi diff. What do you guys think of this set up.

I have a TH350 tranny, my tire size is a 255/60/15 and measures about 26" in height. What kind of rpm would I be turning with the 3.42 at 60mph.

Thanks for the opinions, in advance.

colohusker · 05-23-2002, 05:15 PM

You can find it out at http://www.700r4.com/SpeedOCalc/?calc=1

Scott

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I say it's only money, my wife says it's only a truck....

'71 C10 Deluxe, factory ac, ps, pb, should be done by 2102

'70 C10? unknown
some pics... http://communities.msn.com/71chevy/s...nw?albumlist=2

Longmont, CO
husker95@hotmail.com

Mike C · 05-23-2002, 10:26 PM

I don't like the Auburn, it is a disposable unit when worn out. I would go with the Eaton. Randy's Ring & Pinion for less than $350. 3.42 would be good.

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70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable

05-23-2002, 05:10 PM	#1
Mountain Man Registered User Join Date: Jan 2002 Location: Calgary, Alberta, Canada Posts: 451	Need opinions on differential brands/ratios I need to swap the factory 4.57 posi out of my 67 1/2 ton. I am reving 4,000 at 60mph! I am thinking of going with 3.42 auburn posi diff. What do you guys think of this set up. I have a TH350 tranny, my tire size is a 255/60/15 and measures about 26" in height. What kind of rpm would I be turning with the 3.42 at 60mph. Thanks for the opinions, in advance. __________________ 72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components.

05-23-2002, 05:15 PM	#2
colohusker Registered User Join Date: Apr 2002 Location: Longmont, CO Posts: 436	You can find it out at http://www.700r4.com/SpeedOCalc/?calc=1 Scott ------------------ ------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 '70 C10? unknown some pics... http://communities.msn.com/71chevy/s...nw?albumlist=2 Longmont, CO husker95@hotmail.com __________________ ------------------------------------------------ I say it's only money, my wife says it's only a truck.... '71 C10 Deluxe, factory ac, ps, pb, should be done by 2102 Longmont, CO husker95@hotmail.com

05-23-2002, 10:26 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	I don't like the Auburn, it is a disposable unit when worn out. I would go with the Eaton. Randy's Ring & Pinion for less than $350. 3.42 would be good. ------------------ 70 GMC 3/4 ton Sierra Grande 402/TH400 72 Jimmy 4WD 4spd 4" & 35's 64 Corvette Coupe 68 Camaro 'vert TPI & TH700 69 Z/28 355 12.6's @110 72 Datsun 240Z-ol' reliable __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax



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