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#1 |
Registered User
Join Date: Mar 2007
Location: Estevan, Sask, Canada
Posts: 185
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Need some rear diff help
I have two 6 bolt rear diffs.. the funny thing is the axle tube on each diff measure differently and I am wondering if some one shortened 6 bolt axles to fit in a 5 bolt diff.
The axel tube (measured from the center section to the inside of the square mouning flange) on one measures about 20" +/- 1/8" and the other axle measures about 21" or so. Does any one know what a axle tube on a 5 bolt would be? I want to switch to 5 bolt axles but was going to purchase the axles and drums from CPP. If I indeed have a 5 bolt diff, I'll go to the wreckers and purchase some used axles.
__________________
1967 SWB C-10, BBC 454, T400, 3.73 posi, 20" Coys 1972 K5 Blazer, SBC 400, 4 spd, 3.73, 6" lift, 35" mud grapplers 2011 Sierra Denali HD, 6.6 L Duramax, RBP 96R rims, leveled and Nitto trail grapplers, ![]() 2009 Acura MDX |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Need some rear diff help
it sounds like the short one is a mid to late 1970 rear. Gm widened it in mid '70 in preperation for the wider 5 lug rear.
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#3 |
Registered User
Join Date: Mar 2007
Location: Estevan, Sask, Canada
Posts: 185
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Re: Need some rear diff help
The rear is set up for tariling arms suspension. Did they have this past 1972.
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1967 SWB C-10, BBC 454, T400, 3.73 posi, 20" Coys 1972 K5 Blazer, SBC 400, 4 spd, 3.73, 6" lift, 35" mud grapplers 2011 Sierra Denali HD, 6.6 L Duramax, RBP 96R rims, leveled and Nitto trail grapplers, ![]() 2009 Acura MDX |
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#4 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: Need some rear diff help
The wide rear is the one you want to keep if swaping in newer 5 bolt axles from a junkyard. Aftermarket 5 lug axles are available for the shorter rear, but since you have your pick, use the wider one and get the used axles, much cheaper.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Need some rear diff help
72 was the last year for coil springs and trailing arms.
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#6 |
Registered User
Join Date: Mar 2007
Location: Estevan, Sask, Canada
Posts: 185
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Re: Need some rear diff help
So do you guys think that for the shorter rear end I'll find 5-bolt axles
__________________
1967 SWB C-10, BBC 454, T400, 3.73 posi, 20" Coys 1972 K5 Blazer, SBC 400, 4 spd, 3.73, 6" lift, 35" mud grapplers 2011 Sierra Denali HD, 6.6 L Duramax, RBP 96R rims, leveled and Nitto trail grapplers, ![]() 2009 Acura MDX |
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#7 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Need some rear diff help
5 bolt axles are used in the longer rear end and will be too long for the shorter differential.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#8 |
Registered User
Join Date: Mar 2007
Location: Estevan, Sask, Canada
Posts: 185
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Re: Need some rear diff help
Are you guys saying the longer 6 bolt axles are the same length as the 71/72 5 bolt axles and therefore interchangeable?
__________________
1967 SWB C-10, BBC 454, T400, 3.73 posi, 20" Coys 1972 K5 Blazer, SBC 400, 4 spd, 3.73, 6" lift, 35" mud grapplers 2011 Sierra Denali HD, 6.6 L Duramax, RBP 96R rims, leveled and Nitto trail grapplers, ![]() 2009 Acura MDX Last edited by hemihead; 04-07-2009 at 11:22 PM. |
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#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Need some rear diff help
exactly
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