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14 Bolt Semi Float Conversion Questions

This is a discussion on 14 Bolt Semi Float Conversion Questions within the Technical / Maintenance forums, part of the General Discussion category; I have a '90 Chevy K1500 that has a 10 bolt with 3.73 gears. I want to convert to the ...

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    14 Bolt Semi Float Conversion Questions


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    I have a '90 Chevy K1500 that has a 10 bolt with 3.73 gears. I want to convert to the 3/4 ton 14 bolt semi floater. I just bought brand new wheels and I wanna stay with 6 lug. I don't do any real hardcore off roading. Just some mudding and I wanna be able to go with 38" tires.

    My first question is what years do I search for the complete axle? I found an article that said 86-93 light duty 3/4 ton. Is that correct? I wanna hit the junkyards soon.

    Randy

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    Registered User zraffz's Avatar
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    Re: 14 Bolt Semi Float Conversion Questions

    Yup that sounds about right. My buddy's plow truck is a 88 and has a 6 lug 14 bolt.
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    Re: 14 Bolt Semi Float Conversion Questions

    Cool. Does he wanna sell the rear end? :)

    Are there any other years that will work for a simple swap?

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    Registered User skylark's Avatar
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    Re: 14 Bolt Semi Float Conversion Questions

    If you want a simple swap the you need to stay within you body style. You need an 88-98 or a 99-00 classic (OBS) otherwise you will be changing spring perches and shock mounts. In that you have a 4wd then you need a 4wd rear as well, the 2wd are 3" narrower.
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    Re: 14 Bolt Semi Float Conversion Questions

    Ok so my question is which years do I need to stick with to have a direct bolt in? I want the perches in the same place and the total length to be the same. I heard some years are narrower and some are longer. So I also need to make sure I get a 4WD rear end as the C2500s are shorter?

    I'm thinking 88-93 4WD K2500 so far. What about the Suburbans? Same deal?

    Thanks to all

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    Re: 14 Bolt Semi Float Conversion Questions

    just a heads up, plan on different u-bolts and a conversion u-joint
    97 K1500HD RCLB 5.7, 14 bolt, straight piped, Police Tahoe wheels
    90 'rado C1500HD RCSB 5.7, headers, flowmaster, kn intake, TBI and pod spacer, 14 bolt, G80...tons more...
    79 k10 RCSB 5.7, headers, straight piped, weiand intake, edelbrock carb, 4 in. lift, 35's, rear spiders welded

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    Re: 14 Bolt Semi Float Conversion Questions

    Thanks, does anyone have a part number for the conversion u-joint and u-bolts?

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    Registered User daved931's Avatar
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    Re: 14 Bolt Semi Float Conversion Questions

    1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. Corvette servo, Gibson cat-back, custom tune from Black Bear, AD244 alt. upgrade, Z71 skid plates, Escalade cluster, 2" block + 1.5" crank, 285/75R16 SOLD 1/2012
    2008 Silverado 1500 Z71, Borla catback, block and coil spacer

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    Zumbrota Bearing and Gear iroc_zz's Avatar
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    Re: 14 Bolt Semi Float Conversion Questions

    Quote Originally Posted by RandyOrr View Post
    Ok so my question is which years do I need to stick with to have a direct bolt in? I want the perches in the same place and the total length to be the same. I heard some years are narrower and some are longer. So I also need to make sure I get a 4WD rear end as the C2500s are shorter?

    I'm thinking 88-93 4WD K2500 so far. What about the Suburbans? Same deal?

    Thanks to all
    For a direct bolt in look for these
    1988-98 K1500 w/14 bolt cover (1999 old body w/5.0L or 5.7L also)
    1988-95 K2500 w/6 bolt axles

    Suburbans and the K2500 w/8 bolt axles used a different length housing and axle and a different width spring perch.
    (According to Hollander interchange)
    Last edited by iroc_zz; 11-24-2009 at 11:11 AM.

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    Re: 14 Bolt Semi Float Conversion Questions

    Guy at the junkyard said he has a '89 C2500 with a 14 bolt 6 lug axle. I told him I need a 4WD, he told me they are the exact same. Please advise on this anyone...

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    Re: 14 Bolt Semi Float Conversion Questions

    if i remember correctly my 14 bolt sf out of a 98 4x4 was 68"from wms to wms.

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    Re: 14 Bolt Semi Float Conversion Questions

    Quote Originally Posted by Rain Man View Post
    if i remember correctly my 14 bolt sf out of a 98 4x4 was 68"from wms to wms.
    pardon my dumbness, but what is wms?
    97 K1500HD RCLB 5.7, 14 bolt, straight piped, Police Tahoe wheels
    90 'rado C1500HD RCSB 5.7, headers, flowmaster, kn intake, TBI and pod spacer, 14 bolt, G80...tons more...
    79 k10 RCSB 5.7, headers, straight piped, weiand intake, edelbrock carb, 4 in. lift, 35's, rear spiders welded

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    Re: 14 Bolt Semi Float Conversion Questions

    my 5 lug 14 bolt sf in my 90 is about 58" from backing plate to backing plate
    (yes i know that this is a 454ss rearend that was factory or dealer installed and no its not for sale) lol
    97 K1500HD RCLB 5.7, 14 bolt, straight piped, Police Tahoe wheels
    90 'rado C1500HD RCSB 5.7, headers, flowmaster, kn intake, TBI and pod spacer, 14 bolt, G80...tons more...
    79 k10 RCSB 5.7, headers, straight piped, weiand intake, edelbrock carb, 4 in. lift, 35's, rear spiders welded

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    Registered User Silverad304's Avatar
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    Re: 14 Bolt Semi Float Conversion Questions

    WMS= wheel mount surface....iirc. Just have measure the rear he has and compare it to yours.

    1998 K1500 Silverado DC 6.5 lift w/35" XTerrains
    Pro-comp 7089's and a SF 14 Bolt rear

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