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#1 |
Registered User
Join Date: Sep 2008
Location: The Midwest
Posts: 30
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HO72 frustration
I finally got may hands on an old 7200# third member from a friend of mine for a axle project I'm working on. This way I can swap out the 5200#third in the project axle. So I tore it down and started wire brushing the usual rust off the ring gear and discovered the drive side is shot. It looks like it hauled scrap iron for a living from day one (1949), while low on oil. Not all is lost, at least I have some parts I guess.
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86 Chevy K30 Crew Cab, USAF(retired), TH400/NP205, 28K miles 99 Chevy (88-98 Style) Reg Cab LS, K2500 454, nv4500 92 Dodge, Cummins, SLED PULLER, 5'' hood exit, NV4500UHD, dual disk clutch, Borg Warner S400 charger, GM 7200#/14B hybrid rear Dads... 69 GMC k2500, 427, 4 speed, Rockwell 221, 7200# rear, detroit, disk brake front, 5.13's Last edited by Longhorn Man; 01-07-2009 at 12:34 AM. |
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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: HO72 frustration
The 3rd member on every HO52 and HO72 were the exact same, load deflection bolt and all. The only thing I've seen between the two, is the brakes.
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#3 |
Well, Whoop-dee-do!
![]() Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: HO72 frustration
Not all of them have the deflection bolt. Early carriers & gears (50's?) are different than the later design. I can't remember the year they changed or the exact differences, but IIRC, the pinions are different length. You can't put an early gear set in a late carrier or vise- versa. But you can swap complete third members between early & late housings. I think the u joint to axle centerline measurement is different between the two also.
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD ![]() '72 K20 500 Cad/TH400/NP205 SOLD ![]() '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car ![]() |
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#4 |
Well, Whoop-dee-do!
![]() Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: HO72 frustration
I just noticed you are a NE puller... do you pull with NPPA? If so, which truck is yours?
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD ![]() '72 K20 500 Cad/TH400/NP205 SOLD ![]() '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car ![]() |
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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: HO72 frustration
Good call Jeff... i was talking 67 - 72, I forget they made trucks before 67!
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#6 |
Well, Whoop-dee-do!
![]() Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: HO72 frustration
But we all know you don't acknowledge the '73 up trucks
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD ![]() '72 K20 500 Cad/TH400/NP205 SOLD ![]() '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car ![]() |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: HO72 frustration
73 and up what?
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#8 | |
Registered User
Join Date: Sep 2008
Location: The Midwest
Posts: 30
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Re: HO72 frustration
Quote:
I don't run NPPA quite yet, I do go to some of the local events they tie into and was at Platte City, MO last year. I thought 4.57's are supposedly the most common ratio for these?
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86 Chevy K30 Crew Cab, USAF(retired), TH400/NP205, 28K miles 99 Chevy (88-98 Style) Reg Cab LS, K2500 454, nv4500 92 Dodge, Cummins, SLED PULLER, 5'' hood exit, NV4500UHD, dual disk clutch, Borg Warner S400 charger, GM 7200#/14B hybrid rear Dads... 69 GMC k2500, 427, 4 speed, Rockwell 221, 7200# rear, detroit, disk brake front, 5.13's |
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#9 | |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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Re: HO72 frustration
Quote:
other than that, the 2 3rds i have agree with you. '65 4.57 '52 with a no-spin, and a '68 5.14 '72 with the load bolt, extra oil passages, open carrier with 4 spiders.
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 Last edited by 1969 GMC; 01-07-2009 at 11:20 PM. |
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#10 | |
Registered User
Join Date: Sep 2008
Location: The Midwest
Posts: 30
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Re: HO72 frustration
Quote:
I took a bunch of photos of 5200# and 7200# axles and compared parts with a 14 bolt FF as well. I also researched the GM service information as well. I was thinking of doing a tech post, what does everyone think? Somebody has to have a load bolt third member with 4.57's close to me surely?
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86 Chevy K30 Crew Cab, USAF(retired), TH400/NP205, 28K miles 99 Chevy (88-98 Style) Reg Cab LS, K2500 454, nv4500 92 Dodge, Cummins, SLED PULLER, 5'' hood exit, NV4500UHD, dual disk clutch, Borg Warner S400 charger, GM 7200#/14B hybrid rear Dads... 69 GMC k2500, 427, 4 speed, Rockwell 221, 7200# rear, detroit, disk brake front, 5.13's Last edited by stillsmokin; 01-08-2009 at 12:25 AM. |
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#11 |
Registered User
Join Date: Mar 2008
Location: AUCKLAND NZ
Posts: 264
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Re: HO72 frustration
There aint no body like a square body.
Had to say it.
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77 Cheyenne no longer in bits ![]() |
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#12 |
Registered User
Join Date: Sep 2008
Location: The Midwest
Posts: 30
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Re: HO72 frustration
Yes, those are the trucks I grew up with and love. The rust not so much.
Anymore, if it was made in america it was cool. If it has a bowtie or GMC logo on it, it's all good.
__________________
86 Chevy K30 Crew Cab, USAF(retired), TH400/NP205, 28K miles 99 Chevy (88-98 Style) Reg Cab LS, K2500 454, nv4500 92 Dodge, Cummins, SLED PULLER, 5'' hood exit, NV4500UHD, dual disk clutch, Borg Warner S400 charger, GM 7200#/14B hybrid rear Dads... 69 GMC k2500, 427, 4 speed, Rockwell 221, 7200# rear, detroit, disk brake front, 5.13's |
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