If you are not able to login to the forum, please Contact Us here to let us know. Thanks!

Support FSC and see no ads! - Click Here
Results 1 to 12 of 12

1996 4WD or Z71 Silverado owners

This is a discussion on 1996 4WD or Z71 Silverado owners within the Technical / Maintenance forums, part of the General Discussion category; so i looked at a possible donor truck for my truck wich is a 1996 Chevy Silverado 4WD 5.7 liter ...

  1. #1
    Registered User
    Join Date
    May 2010
    Location
    Texas
    Posts
    31

    1996 4WD or Z71 Silverado owners


    Support FSC and see no ads! - Click Here
    so i looked at a possible donor truck for my truck wich is a 1996 Chevy Silverado 4WD 5.7 liter vortec im sure you all know. I discovered on the to-be donor truck that there was a 10 bolt rear end and my current truck has a 14 bolt rear end. was that rear end swapped or did they put the 10 bolts in the basic 4wd models. so what im getting at is what bolt patterns came on the 4wd models and what bolt pattern came with the z71 packages? can u go peek under ur truck and tell me and also do you guys know the gear ratio that came with the 14 bolts thanx for yalls help this site has assisted me greatl with all my trucks needs
    SNAKE

  2. #2
    GearheadDezign.com woody80z28's Avatar
    Join Date
    Oct 2009
    Location
    Walton, NY
    Age
    29
    Posts
    635

    Re: 1996 4WD or Z71 Silverado owners

    My 94 Z71 has a 10-bolt. And as far as I know the OBS 1/2 tons had 6-lug 10s, 3/4 tons had 6-lug 10s or 14s, 1 tons had 8-lug 14s.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

  3. #3
    Registered User
    Join Date
    Sep 2009
    Location
    Maine
    Posts
    1,737

    Re: 1996 4WD or Z71 Silverado owners

    Quote Originally Posted by woody80z28 View Post
    My 94 Z71 has a 10-bolt. And as far as I know the OBS 1/2 tons had 6-lug 10s, 3/4 tons had 6-lug 10s or 14s, 1 tons had 8-lug 14s.
    In this generation trucks - GMT400 -
    Standard rear axle in the half tons was the 10 bolt, six lug. They could be ordered with the 9.5" 14 bolt SF, and some apparently came through with the 14 bolt for whatever reason. And there is no rhyme nor reason to it. A friend has a 96 K1500 ECSB, 305, 14 bolt rear. He bought it from the original owner who ordered it that way.

    3/4 tons always have the 9.5" 14 Bolt SF, six or eight lugs.

    One tons have the 10.5" 14 Bolt FF, eight lugs.

  4. #4
    Registered User
    Join Date
    Feb 2010
    Location
    SW OH
    Posts
    2,060

    Re: 1996 4WD or Z71 Silverado owners

    Z71 doesn't affect which rear end model the truck got. It's nothing but skid plates, shocks, and sway bars. Oh... and stickers. Can't forget those.

    GVW is the key to the rear end model.

  5. #5
    Registered User
    Join Date
    Aug 2008
    Location
    Lanesville, IN
    Posts
    136

    Re: 1996 4WD or Z71 Silverado owners

    chevyman572,

    Pretty much as 2COR517 said... GMT400 trucks (aka OBS) 1/2 tons came "stock" with a 10 bolt 6-lug rear. The optional rear axle was RPO code F44 and for about $400 (back in 96) you could order the 14 bolt 6-lug axle which was a semi-floating unit with a 9.5" ring and pinion gear. This F44 option could be ordered on all models. Z-71 was another option backage which included (among a few other things) Bilstein shocks and full skidplates. It was advertised as an "offroad package" but did not specify a specific axle nor ratio. Several ratios were available including 3.08, 3.42 and 3.73. There might be others... Further axle "enhancement" was available by ordering the G80 option, which was a limited slip, available for both the 10 and 14 bolt axles.

    Hope this helps...
    1996 K1500 ECSB 350 5-spd (original owner)
    3.73's, F44, G80, Mag-Hytec Diff Cover, X-tra Leaf, Timbren Kit, Bilstein HDs
    Custom Stainless Duals (Cats Back), Hurst Comp Shifter, K&N Air Filter, HD Clutch
    True Radious Bending - Brush Guard w/ Hella 550's
    Ranch Hand "Cowboy" Rear Bumper

  6. #6
    GearheadDezign.com woody80z28's Avatar
    Join Date
    Oct 2009
    Location
    Walton, NY
    Age
    29
    Posts
    635

    Re: 1996 4WD or Z71 Silverado owners

    Quote Originally Posted by 2COR517 View Post
    In this generation trucks - GMT400 -
    Standard rear axle in the half tons was the 10 bolt, six lug. They could be ordered with the 9.5" 14 bolt SF, and some apparently came through with the 14 bolt for whatever reason. And there is no rhyme nor reason to it. A friend has a 96 K1500 ECSB, 305, 14 bolt rear. He bought it from the original owner who ordered it that way.

    3/4 tons always have the 9.5" 14 Bolt SF, six or eight lugs.

    One tons have the 10.5" 14 Bolt FF, eight lugs.
    Interesting, I had no idea you could get a 14 in a 1/2 or an 8-lug in the 3/4. I know the NBS trucks could be 8-lug 3/4, but I've never seen a an OBS like that.
    80 Camaro Z28 - 550hp AFR 383 EFI / T56 6spd
    91 Beretta "SS" - 220hp 3400 MPFI / HM282 5spd
    94 Silverado Z71 - 300hp Vortec 357 TBI / NV4500 5spd build thread

  7. #7
    Registered User
    Join Date
    Sep 2009
    Location
    Maine
    Posts
    1,737

    Re: 1996 4WD or Z71 Silverado owners

    Quote Originally Posted by RB04Av View Post
    Z71 doesn't affect which rear end model the truck got. It's nothing but skid plates, shocks, and sway bars. Oh... and stickers. Can't forget those.

    GVW is the key to the rear end model.
    Stickers rule!

  8. #8
    Registered User
    Join Date
    Feb 2010
    Location
    SW OH
    Posts
    2,060

    Re: 1996 4WD or Z71 Silverado owners

    Most important part!!

  9. #9
    Registered User east302's Avatar
    Join Date
    Mar 2006
    Location
    Jackson, MS
    Posts
    1,012

    Re: 1996 4WD or Z71 Silverado owners

    Sort of a noob question, and I see a lot of people talking about swaps, but what was the advantage of a 14-bolt over a 10?
    1998 Chevrolet Z71, 350 auto
    2003 Chevrolet Tahoe 4x4, 5.3L

    When I die, I want to go peacefully in my sleep like my grandpa, not yelling and screaming like the passengers in his car.

  10. #10
    Registered User
    Join Date
    Oct 2007
    Location
    TN
    Age
    31
    Posts
    7,854

    Re: 1996 4WD or Z71 Silverado owners

    14b is alot stronger then the 10b.
    The 14b in a 1/2 ton or light 3/4 ton is a SF (semi floating) meaning like the 10b they have the c clips and the diff must be opened to pull the axles. (unless the axle breaks then well the axle will pull itself)
    On the 14b in 3/4 and 1 tons (8 lug) they are a FF (full floater) meaning they have no c clips. The axle simply slides into the diff, and the wheel side flange bolts to the hub/drum. When these break the tire stays on and the diff does not have to opened to get the axle out.
    The advantage to this other then strength is if on breaks, you will not lose your tire. If your diff locks up (say the rear on a 4x4) you can pull the driveshaft and axles (cover the hub ends so you don't lose your diff fluid) and drive home in a FWD pickup. On a trail you will chew up the axle some but if it does break you can simple leave it in and drive it out. (you would hear and probably feel it along with create some floating metal in the fluid, but it can be done)


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

  11. #11
    Registered User
    Join Date
    May 2008
    Location
    Troy,Ohio
    Age
    48
    Posts
    224

    Re: 1996 4WD or Z71 Silverado owners

    Another strength is that on a semi float axle, the trucks load is being placed on not only small outer bearings placed inside the tube end, but the axle shaft carries the load as well. On a full floating axle the bearings are much larger as they are on the outside of the tube, and it(actually they as there are inner and outers) carries the weight. The axle shaft can then be much larger, and its only job is to turn the wheel. you can flat tow a vehicle with FF by making plates that bolt in place of the axles or finding 2 junk axles and torching the ends off and use them.

  12. #12
    Registered User
    Join Date
    Sep 2009
    Location
    Maine
    Posts
    1,737

    Re: 1996 4WD or Z71 Silverado owners

    Quote Originally Posted by kcb37 View Post
    14b is alot stronger then the 10b.
    The 14b in a 1/2 ton or light 3/4 ton is a SF (semi floating) meaning like the 10b they have the c clips and the diff must be opened to pull the axles. (unless the axle breaks then well the axle will pull itself)
    On the 14b in 3/4 and 1 tons (8 lug) they are a FF (full floater) meaning they have no c clips. The axle simply slides into the diff, and the wheel side flange bolts to the hub/drum. When these break the tire stays on and the diff does not have to opened to get the axle out.
    The advantage to this other then strength is if on breaks, you will not lose your tire. If your diff locks up (say the rear on a 4x4) you can pull the driveshaft and axles (cover the hub ends so you don't lose your diff fluid) and drive home in a FWD pickup. On a trail you will chew up the axle some but if it does break you can simple leave it in and drive it out. (you would hear and probably feel it along with create some floating metal in the fluid, but it can be done)
    Good post, but I'll add one point. In 1981, GM went to the 9.5 SF 14B in all 3/4 ton pickups. It was to help reduce weight, and of course cost. They continued this through the 98 K2500 GMT400, even on the 8600GVW. The 9.5 SF is a tough axle, I have never heard or read of one failing. As far as I know, the 99 and up GMT800&GMT900 2500HD trucks have the 10.5 FF 14B. I do not know which axle the 2500 nonHD trucks came with.

 

 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •