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rear end swap

This is a discussion on rear end swap within the Technical / Maintenance forums, part of the General Discussion category; got a 96 chevy 1500 my g80 in my 10bolt blew up and i was wondering what rear ends would ...

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    rear end swap


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    got a 96 chevy 1500 my g80 in my 10bolt blew up and i was wondering what rear ends would be a different bolt on with out any modification..i wanna put a 14bolt SF

  2. #2
    Registered User daved931's Avatar
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    Re: rear end swap

    You can snag a 14 bolt SF from an 88-98 half ton or light duty three quarter ton (six lug). It will bolt in with a conversion u-joint and new u-bolts. If you have four wheel drive, make sure you get the same gear ratio. Also, 4wd axle housings are wider than the 2wd housings by 3".
    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. All kinds of upgrades, SOLD 1/2012
    2008 Silverado 1500 Z71, leveling kit, exhaust, SOLD 9/2014
    2014 Silverado 1500 Z71, stock for now

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    Re: rear end swap

    alright thanks another quick question even though i had the g80 in my 10bolt could i just swap the diff out with a posi diff if its the same size ring gear?

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    Registered User daved931's Avatar
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    Re: rear end swap

    If you find another complete diff from a truck with an 8.5" ten bolt, you can swap it out. I would probably take the opportunity to upgrade to a 14 bolt though.
    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. All kinds of upgrades, SOLD 1/2012
    2008 Silverado 1500 Z71, leveling kit, exhaust, SOLD 9/2014
    2014 Silverado 1500 Z71, stock for now

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    Re: rear end swap

    yeah i kno but im only 17 and dont have a lot of money right now haha

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    Registered User daved931's Avatar
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    Re: rear end swap

    I understand completely. I'd shop around. You might find a complete 10 bolt or 14 bolt SF for close to the same price as just a complete rear end. Something to keep in mind.
    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. All kinds of upgrades, SOLD 1/2012
    2008 Silverado 1500 Z71, leveling kit, exhaust, SOLD 9/2014
    2014 Silverado 1500 Z71, stock for now

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    Re: rear end swap

    While this is going, how different is a 95-10 bolt 5 lug compared to a 99 nbs 10 bolt 6 lug? would the nbs rear fit in my 95 tahoe?

    Thanks xZoomerZx

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    Registered User daved931's Avatar
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    Re: rear end swap

    It will fit but the spring perches need to be moved
    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. All kinds of upgrades, SOLD 1/2012
    2008 Silverado 1500 Z71, leveling kit, exhaust, SOLD 9/2014
    2014 Silverado 1500 Z71, stock for now

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    Re: rear end swap

    thanks and is it the exact same width?

    Thanks xZoomerZx

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    Registered User daved931's Avatar
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    Re: rear end swap

    Yes, it should be the same width. You may have to swap over the brakes and backing plates or get a proportioning valve. A 99 GMT800 (NBS) will have rear disc and your 95 GMT400 (OBS) will have rear drum.
    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. All kinds of upgrades, SOLD 1/2012
    2008 Silverado 1500 Z71, leveling kit, exhaust, SOLD 9/2014
    2014 Silverado 1500 Z71, stock for now

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    Re: rear end swap

    sweet thanks man

    Thanks xZoomerZx

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    Registered User MetalDrummer's Avatar
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    Re: rear end swap

    Thanks daved931! You answered all my questions, and I didn't have to ask any! Oh yeah - 10 bolts suck! I grenaded mine a few days ago and almost lost my axle shafts while limping back to the trailhead.

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    Registered User loudchevy's Avatar
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    Re: rear end swap

    Quote Originally Posted by daved931 View Post
    You can snag a 14 bolt SF from an 88-98 half ton or light duty three quarter ton (six lug). It will bolt in with a conversion u-joint and new u-bolts. If you have four wheel drive, make sure you get the same gear ratio. Also, 4wd axle housings are wider than the 2wd housings by 3".
    Axle width is the same on 4 and 2wd as far as I know, at least the 2wd and the 4wd axles i have are. The spring pads on a 2wd are 4 in narrower. Overall width (hub to hub) is based on the truck configuration (i.e. cab and chassis, panel van, drw, srw)

    1998 Chevy K1500 Z71, 350 Vortec
    Mods: Exaust, 3 in Body Lift,
    Toyo A/T 305x70R16
    Soon to come: Straight axle conversion with dana 44 front/GM 14 bolt rear 8 lug all around.

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    Re: rear end swap

    Since you are on this topic.... I have a 92 C1500 standard cab short bed. It has the factory 3.73 gears and posi traction. I am planning on building a 406 for it and want around 400 hp/tq. What is the best rear I can find for my truck from a wrecking yard? (10, 12, 14 bolt, etc.)? Also, what years and vehicles would they come from?

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    Registered User loudchevy's Avatar
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    Re: rear end swap

    If you are going to race it I would shoot for a Ford 9 inch but since those can be pricey a rebuilt 12 bolt would probably work. A 14 bolt would be the strongest but I doubt you want a 450 lb axle in a street machine. maybe a 14 bolt SF 6 lug though. Stay away from a 10 bolt for sure that's what you have now most likely.

    1998 Chevy K1500 Z71, 350 Vortec
    Mods: Exaust, 3 in Body Lift,
    Toyo A/T 305x70R16
    Soon to come: Straight axle conversion with dana 44 front/GM 14 bolt rear 8 lug all around.

  16. #16
    Big, Red, & Ugly rcpeper's Avatar
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    Re: rear end swap

    I'm putting 400lbs of torque in my stock 8.5 with 3.42 gears and an Eaton, and have been doing so for 8 years, with no issues. I also have a 14 Bolt SF out of a 454SS with 5 lug axles I am building to put under my truck so I can shoot for 500.

    Rob
    Last edited by rcpeper; 03-01-2010 at 06:33 PM.
    92 Chevy 1500 Sport
    GMPP 350 HO with 700R4 250RWHP
    2.5" True Dual Exhaust Delta 40's
    3.42 Gears with Eaton Posi
    Edelbrock Vortec TPI
    MSD Ignition, 8MM wires
    3.5" driveshaft by Denny's driveshaft

  17. #17
    I owned a Ford.....twice stupid friend's Avatar
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    Re: rear end swap

    check out craigslist, I don't know where you are in Kansas, but in the past week there has been quite a few 14 bolts on there. IIRC some were in the KC. area.
    Originally Posted by nebraskaz71

    I fingered where I could fit, few tight spots though and then it kept seeping out all over the place even after releasing pressure. What a mess

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    Re: rear end swap

    You can swap yokes on the 10bolt and 14bolt aswell and just use the 10bolt u-joint. i would go for the 14bolt sf over any 10bolt.
    91 GMC Sierra on 38.5" swampers(My Toy)
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  19. #19
    Big, Red, & Ugly rcpeper's Avatar
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    Re: rear end swap

    You can't swap pinion yokes. The 8.5 has a 1.626 pinion diameter with 30 spline where the 9.5 has a 1.876 pinion diameter with 30 spline.

    Rob
    92 Chevy 1500 Sport
    GMPP 350 HO with 700R4 250RWHP
    2.5" True Dual Exhaust Delta 40's
    3.42 Gears with Eaton Posi
    Edelbrock Vortec TPI
    MSD Ignition, 8MM wires
    3.5" driveshaft by Denny's driveshaft

  20. #20
    Why don't you shirt it up 07tbss's Avatar
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    Re: rear end swap

    Quote Originally Posted by loudchevy View Post
    If you are going to race it I would shoot for a Ford 9 inch but since those can be pricey a rebuilt 12 bolt would probably work. A 14 bolt would be the strongest but I doubt you want a 450 lb axle in a street machine. maybe a 14 bolt SF 6 lug though. Stay away from a 10 bolt for sure that's what you have now most likely.
    Just to throw some facts out there from some reasearch....a 14 bolt is nowhere near 450lbs..I happen to know this because i just bougth a 14 bolt out of a 454ss and i can move it around the shop by myself...maybe in the 250-300 range if that...so there would be no prob putting it in a street truck...mine is a short bed reg cab and it is 2wd and i will be swapping out my 10 bolt shortly..12 bolts are getting more and more rare...hence they will be expensive if you find a good one...Id say they best option for the 88-98 2wd guys is a 454 ss 14 bolt rearend (which i have) since it has the 5 on 5 pattern...or buy a 2wd 2500 14 bolt and get the axel shafts redrilled to a 5 on 5 pattern... Also i know for a fact the axels are wider on the 4wd OBS's
    Last edited by 07tbss; 03-04-2010 at 12:40 AM.

 

 

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