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Thread: GM 7.5, 8.5 and Ford 8.8 axle info

  1. #1
    87wildside Guest

    GM 7.5, 8.5 and Ford 8.8 axle info

    GM made two housings that came in these trucks, the 7.5/ 7.625 and the 8.5, both of which are ten bolts. The 7.5 has more of a squared of shape to the cover and straight axles tubes that measure 2 3/4" whereas the 8.5 uses a round cover and the axle tubes step down from 3" to 2 3/4" near the leaf pads. This photo shows the 7.5 on top and the 8.5 on the bottom.

    2 wheel drive width from WMS to WMS is 54.5 inches
    4 wheel drive width from WMS to WMS is 59-60 (depending who measures it) inches

    S10 Rear end Ring Gear and Axle Sizes:
    1983 to 1992 7.5" ring gear 26 spline axles
    Available from 1988+ 7.625" ring gear 28 spline axles
    Available from 1995 and up, 8.5" ring gear 30 spline axles, standard for 98+ ZR2's with rear discs



    These are some of the axle RPO codes and should be the same for all GMs with either of these axles.

    GU4=3.08
    GU5=3.23
    GU6=3.42
    GT4=3.73
    GT5=4.10
    HC4=4.56

    G80= locking differential

    Here is a Ford ID tag that should be on the axle however many scrap yards remove these (some people will swap a locker tag with open tag to save money hint, hint)



    Rear axle codes can be found on a label attached to the left drivers side door lock post. The code appears as a number or letter/number combination in the 'Axle' column of the label. The axle can also be identified by the tag on the axle differential cover bolt. See the diagram above to learn how to read the tag.



    All disk brake Explorer rear ends had 31 spline axles however there were a few drum brake rears that were 28 spline. Disc brakes was 95+
    All Ranger other the the FX4 20002 and 2003 Lever II trim had 28 spline axles

    Here's all the specs, measurements, and misc crap about the Explorer 8.8 you'll ever want to know.

    Ford 8.8 specs:

    Weight (complete assembly w/ brakes etc.): 174 lb.

    Axle shaft strength: 6,500 (lb. ft.)

    Drivers side Ford brake hose #:F5TZ-2282-A

    Passenger side brake hose #: XL2Z-2282-AA

    Bolt size (U-joint flange to yoke) is: 12 x 1.75 x 30 mm

    Driveshaft Flange: Spicer Part Number 2-2-1379

    Measurements:

    O.D. of tubes: 3.250".

    Tube thickness: .250" (some are .188!)

    Ring gear diameter: 8.800".

    Ring gear bolts: 7/16" dia. (qty. 10).

    Pinion diameter/splines: 1.625 / 30.

    Axle shaft/splines: 1.320 / 31.

    Rotor thickness (where it mounts to axle is .250").

    Overall width 59.625". I have come up measurements online that say up to an inch wider, check yourself to be sure.

    Hole diameter for ABS sensor in top of housing: .811".

    Centerline of housing to C/L of pinion difference is 3.875" toward the P/S.

    Explorer disks are non vented and measure 11 1/4" and are 5/8" thick.

    8.8 to 7.5 comparison pics. Jason sent me these in an email, thanks Jason.




  2. #2
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    Sweet
    I know how things go together & I'm not putting my 'Tab A' in your 'Slot B', dude..

    Quote Originally Posted by D-Caf View Post
    If you don't like it, then take it up with management. Just remember, I'm part of management and I DON'T WANT TO HEAR IT!

  3. #3
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    So can I take an 8.5 out of a 2wd Jimmy and slap it right under my 2wd Sonoma? Or is there mods that need to be done?

  4. #4
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    as long as there the same. leaf spring perchs are the same distance across an the messurment from backing plate to backing plate is the same i dont see why they wouldnt innerchange
    U get what u get an dont throw a fit

  5. #5
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    oh ya check to see if the pinion is the same style mount 4 the u-joint may be different
    U get what u get an dont throw a fit

  6. #6
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    Where are the pics?
    1998 GMC Jimmy, 2dr/2wd, 4.3L V-6/4L60E: , Wynjammer S/C @8psi, Accel 300+ ign box, Taylor 8mm wires, CFM-Tech tb blade, Trans-Go shift kit w/vette servo, cat delete, Hooker Maxflow muffler, Zexel Torsen LSD, Marine intake, 42lb/hr injectors, aeromotive stealth 340 in-tank pump, racetronix fuel pump wiring harness, AEM UEGO W/B A/F gauge, LS1 E-Fans, self tuned w/HPTuners, best 1/8th mile E.T. so far: 2.26 60' 9.55@73mph <<<6psi.


  7. #7
    EricPts10 Guest

    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    Quote Originally Posted by 12sws27 View Post
    Where are the pics?
    I can't find the second pic but here are the rest in order. Feel free to add then to the first post






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    Last edited by EricPts10; 06-13-11 at 07:39 PM.

  8. #8
    EricPts10 Guest

    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    Here is some more 8.8 axle info.
    *note* The Explorer has 31 spline axles.

    Ford 8.8 Strength Comparison
    The truth is that the Ford 8.8 is virtually a clone of the Chevy 12-bolt and therefore almost as strong. Most rear axles are described by their ring-gear diameters, with larger being better. A Ford 9-inch has a ring-gear diameter of, you guessed it, 9 inches closely followed by the 12-bolt at 8.875, with the Mustang rear at 8.80 inches. Another strength consideration is pinion-shaft diameter. Here, the 8.8 and the 12-bolt are identical at 1.625 inches and in fact use the same pinion bearings. By comparison, the Ford 9-inch pinion shaft measures only 1.313 inches. The Achilles' heel of the stock 8.8 Ford rearend is its 28-spline axles, especially when compared to the Chevy 12-bolt's stronger 30 splines. Ford eventually rectified this oversight and upgraded the '94-'99 Mustang 8.8 rears with 31-spline axles and larger axletubes. These rear-axle assemblies are now beginning to populate the recycling yards and should be available at a decent price. These housings are slightly wider than the '86-'93 housings and may actually fit some of the wider leaf-spring-car requirements, so keep that in mind as well.

    The point of all this is that the Ford 8.8 has all the basic components to create a performance rearend; it just needs a little aftermarket help to make it stronger. The original Fox-body 8.8 used from '86-'93 can be easily upgraded with better axles, a stronger limited slip with more clutches, and bigger axle bearings to become a very durable yet light rearend assembly. And the best part is you won't spend a ton of money to get there.

    Follow the link for more.

  9. #9
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    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    The 8.5" GM rear has the same pinion shaft diameter and 30 spline axles.

    GM 8.5"... http://www.drivetrainspecialists.com...m/gm-85-chevy/

    Ford 8.8"... http://www.drivetrainspecialists.com.../ford/ford-88/

    I wonder if the GM 8.625" is the same? Gotta look into that.

  10. #10
    EricPts10 Guest

    Re: GM 7.5, 8.5 and Ford 8.8 axle info

    hmmm....

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