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Thread: Rear end suggestions?

  1. #1
    Registered User rtuite's Avatar
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    Rear end suggestions?

    Well, I am finally getting the 700r4 put together, and I am sort of worried about my rear end. I have a B&M shift kit, Alto Red Eagle clutches, HP servo, and a carbon impregnated flex band. I know these diffs are notoriously weak, and I want to beef mine up prior to letting the transmission slam the piss out of it. Anybody been through this and have any suggestions?

    I was at one point thinking about putting in a Ford 8.8" if I can find one at a junk yard, especially if I can find one off of an explorer with rear disc brakes. But I am wondering if modding the unit to fit my truck will be worth the effort and I should just beef up the one I have.
    '88 2 door, 400SB
    see progress here

  2. #2
    Zombie Killer 6SpeedBlazer's Avatar
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    if you want to build a strong 7.5 i would do the following

    solid pinion spacer
    aluminum diff cover with bearing cap supports
    welded axle tubes
    good posi unit like an eaton, aburn, or zexel.

    with around a 3.42 gear ratio and 28 spline axles it will be a decent rear end.

  3. #3
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    yes the 8.8 will be worth the effort.

    Search for an LKQ in indiana and see if they have one there. They sell disc and drum 8.8's for the same price.


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  4. #4
    ls1+t56+01=love low86blazer's Avatar
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    beef the 7.5
    find a 8.5 out of a 98+4.3manual.
    8.8, wider than stock but it can work.
    Quote Originally Posted by bayhustle81 View Post
    can i add the vortec to this 4.3 if it didnt come with one?
    Quote Originally Posted by Superbee View Post

  5. #5
    Zombie Killer 6SpeedBlazer's Avatar
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    Quote Originally Posted by low86blazer View Post
    beef the 7.5
    find a 8.5 out of a 95+4.3manual.
    8.8, wider than stock but it can work.

    fixed

  6. #6
    ls1+t56+01=love low86blazer's Avatar
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    Quote Originally Posted by 6SpeedBlazer View Post
    fixed
    ahh my mistake.
    Quote Originally Posted by bayhustle81 View Post
    can i add the vortec to this 4.3 if it didnt come with one?
    Quote Originally Posted by Superbee View Post

  7. #7
    5.7L VORTEC 350 blazin4low's Avatar
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    I bought a disc rear from a 98+ blazer and beefed it up. Just waiting on brake parts and some timw off to slap it in.

    Solid pinon spacer
    Diff cover
    New bearings
    Zexel with 3.42 gears

    Only thing I didn't do was weld the tubes, but I can do that later if need be
    http://i158.photobucket.com/albums/t114/VortecBlazer/sidredo.jpg
    Tuned by Bland Tuning
    Transmission built by Transbuilderguy on FSC!
    Marine Intake swap by me

  8. #8
    Senior Member bigjsp's Avatar
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    if it breaks you are making more than 330 hp and hooking it up.

    i haven't been able to make a 7.5 or any gm last more then 10,000 miles inclusive of eaton , welded tubes and covers and external back brace

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