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09-07-2007, 07:48 AM
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#1 |
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Active Member
 Join Date: Feb 2000
Location: Carroll County Maryland
Posts: 300
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Changing out my 3/4 ton, 1972 rear
I want to change out my 72 GMC 3/4 rear gears to to 373:1 and posi
Where should I start to look? Thanks
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68 short fleet 383 stroker, 700r4 373:1 posi 72 GMC 3/4 ton- weekly driver 700r4 351;1 posi |
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09-07-2007, 01:27 PM
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#2 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Changing out my 3/4 ton, 1972 rear
You might do best to consider a later rear.The 14-bolts came with 3.73 in alot of trucks and you would only need to move one shock mount and the spring pads.That would keep you from setting up a new ring & pinion and the parts purchase.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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09-07-2007, 03:11 PM
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#3 |
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Active Member
Join Date: Feb 2000
Location: Carroll County Maryland
Posts: 300
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Re: Changing out my 3/4 ton, 1972 rear
Thanks Tim
That's a start
__________________
68 short fleet 383 stroker, 700r4 373:1 posi 72 GMC 3/4 ton- weekly driver 700r4 351;1 posi |
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09-07-2007, 04:31 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Changing out my 3/4 ton, 1972 rear
need to start with knowing what's under there now.
Is it a dana? Is it an Eaton/cororate? What gear ratio is it? |
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09-07-2007, 07:31 PM
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#5 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Changing out my 3/4 ton, 1972 rear
That`s true.I figured it was a Dana60.There weren`t 3.73s for either,right?
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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09-07-2007, 09:25 PM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Changing out my 3/4 ton, 1972 rear
correct.
5.something, 4.57, 4.10, 3.56 |
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09-08-2007, 01:29 AM
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#7 |
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Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: Changing out my 3/4 ton, 1972 rear
and the 3.56 only in the dana
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common sense isn't so common anymore |
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09-08-2007, 07:40 AM
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#8 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Changing out my 3/4 ton, 1972 rear
Yeah,that`s what you`d want.But,finding one?Never tryed replacement parts,but I never see them in Danas,personally.
The Eatons never went as low.Very few 3.90s out there,it seems.I think my to truck has 5.13s or whatever the increment was.I can want as fast as the speed it can be shifted to 4th.Well,power-walk  .Now stop visualizing that!
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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