Differential/Gearing identification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

83scsb · 09-15-2012, 06:44 PM

I have an 83 c10 which was a 250/auto truck, now a 350/th350. Id really like to put an auburn/eaton diff in it to get rid of the "limited slip". My question is what gearing would I MOST LIKELY have, and would my current ring and pinion assembly bolt up to a auburn/eaton diff?
The truck turns very low rpm in the 40-50 mph range...

**hatzie** · 09-15-2012, 08:45 PM

Do you have the SPID sticker in the glovebox?
You'll find the original factory gearing and presence of limited slip diff on the SPID stcker.

D13 · 09-16-2012, 06:15 AM

MOST likely is 3.08. But it could be a wide range depending on what the truck originally was. I've had 4.11 to 2.37's in my half tons, from the factory.

If the carrier is the same series, yes your gears will swap. But unless they are relatively new, and you know exactly what you're doing, it's better to just put in new gears. But you need to know the ratio.

Why do you want to get rid of the limited slip? That is a 'posi'. The two you mentioned are usually posi's. Do you actually have an 'open' diff and want a posi?

INSIDIOUS '86 · 09-16-2012, 01:31 PM

The ten bolt has auburn or eaton units available but I would suggest the eaton since they can be rubuilt.
Posted via Mobile Device

09-15-2012, 06:44 PM	#1
83scsb Registered User Join Date: Aug 2012 Location: CT Posts: 4	Differential/Gearing identification I have an 83 c10 which was a 250/auto truck, now a 350/th350. Id really like to put an auburn/eaton diff in it to get rid of the "limited slip". My question is what gearing would I MOST LIKELY have, and would my current ring and pinion assembly bolt up to a auburn/eaton diff? The truck turns very low rpm in the 40-50 mph range...

09-15-2012, 08:45 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,014	Re: Differential/Gearing identification Do you have the SPID sticker in the glovebox? You'll find the original factory gearing and presence of limited slip diff on the SPID stcker. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

09-16-2012, 06:15 AM	#3
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: Differential/Gearing identification MOST likely is 3.08. But it could be a wide range depending on what the truck originally was. I've had 4.11 to 2.37's in my half tons, from the factory. If the carrier is the same series, yes your gears will swap. But unless they are relatively new, and you know exactly what you're doing, it's better to just put in new gears. But you need to know the ratio. Why do you want to get rid of the limited slip? That is a 'posi'. The two you mentioned are usually posi's. Do you actually have an 'open' diff and want a posi? __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

09-16-2012, 01:31 PM	#4
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: Differential/Gearing identification The ten bolt has auburn or eaton units available but I would suggest the eaton since they can be rubuilt. Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511



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