switching rears? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SquareChevy · 12-30-2016, 12:27 AM

Well turns out 86 k10 didn't come with a 12 bolt rear..**** if I ever knew lol.
Story is I ****ed the old g80 carrier up in my rear so I needed a new carrier, went from a locker to open diff..sad...thought I could just go out to the junkyard and find another g80 carrier for 12 bolt..i cant but I sure can find a **** ton of 10 bolts with g80's.

So if my truck has a 700r4 trans to a 205 transfer case(not full time 4wd)
to a 12 bolt rear and I wanted to switch back to a 10 bolt, what would have to change? would the driveshaft have to be shorter or longer? would I have to extend or shorten anything? wheel base still the same?

**hatzie** · 12-30-2016, 12:49 AM

Supposedly the 12bolt uses a driveshaft that's 3/4" longer so you may have to shorten yours. The rear universal joints may be different as well. YMMV.

http://67-72chevytrucks.com/vboard/s...d.php?t=158034

andrewmp6 · 12-30-2016, 04:31 AM

If you have a 700r4 you got a np208 the np205 never came factory on that trans.

**Desert1957** · 12-30-2016, 09:51 AM

You sure that you have a G80?

I have never seen a squarebody with one factory installed, Didn't come out until years later.

http://www.autoevolution.com/news/a-...ial-94874.html

SquareChevy · 12-30-2016, 01:32 PM

Quote:

Originally Posted by Desert1957

You sure that you have a G80?

I have never seen a squarebody with one factory installed, Didn't come out until years later.

http://www.autoevolution.com/news/a-...ial-94874.html

yea 72-87 or 73-87 I forget could come with g80, in my glovebox I have a code that says g80 (auto locker) but my truck came factory with a 10 bolt g80, and the guy I bought it off of must have switched it to 12 bolt with a g80, and since I cant find 12 bolts easily I was thinking about going back to what it originally had.. 10bolt with a g80 carrier

SquareChevy · 12-30-2016, 01:35 PM

Quote:

Originally Posted by Desert1957

You sure that you have a G80?

I have never seen a squarebody with one factory installed, Didn't come out until years later.

http://www.autoevolution.com/news/a-...ial-94874.html

https://en.wikipedia.org/wiki/Chevrolet_C/K go to third gen then chassis and powertrain, it will tell u about it

SquareChevy · 12-30-2016, 01:38 PM

Quote:

Originally Posted by hatzie

Supposedly the 12bolt uses a driveshaft that's 3/4" longer so you may have to shorten yours. The rear universal joints may be different as well. YMMV.

http://67-72chevytrucks.com/vboard/s...d.php?t=158034

thanks so just a shorter driveshaft and u joints..not bad THANKS for your help!

12-30-2016, 12:27 AM	#1
SquareChevy Registered User Join Date: Dec 2016 Location: Pennsylvania Posts: 36	switching rears? Well turns out 86 k10 didn't come with a 12 bolt rear..** if I ever knew lol. Story is I ed the old g80 carrier up in my rear so I needed a new carrier, went from a locker to open diff..sad...thought I could just go out to the junkyard and find another g80 carrier for 12 bolt..i cant but I sure can find a ** ton of 10 bolts with g80's. So if my truck has a 700r4 trans to a 205 transfer case(not full time 4wd) to a 12 bolt rear and I wanted to switch back to a 10 bolt, what would have to change? would the driveshaft have to be shorter or longer? would I have to extend or shorten anything? wheel base still the same?

12-30-2016, 12:49 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,933	Re: switching rears? Supposedly the 12bolt uses a driveshaft that's 3/4" longer so you may have to shorten yours. The rear universal joints may be different as well. YMMV. http://67-72chevytrucks.com/vboard/s...d.php?t=158034 __________________ 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.

12-30-2016, 04:31 AM	#3
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: switching rears? If you have a 700r4 you got a np208 the np205 never came factory on that trans.

12-30-2016, 09:51 AM	#4
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: switching rears? You sure that you have a G80? I have never seen a squarebody with one factory installed, Didn't come out until years later. http://www.autoevolution.com/news/a-...ial-94874.html __________________ Desert



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