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#34110 03/20/2003 6:01 PM | Joined: Feb 2003 Posts: 66 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 66 | I know this question has been asked before, but most of the replies seem to be directed twart 1/2 ton axles.
Anyway, I want to swap my axle out for one with a faster gear ratio than the 4.57 mine currently has. What would be a good donar vehicle for this. I would like to get to at least 3.7_.
Thanks,
Brian K
Sometimes, David beats Goliath. Nobody talks, however, about how many little guys Goliath already beat into the ground. . .
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#34111 03/20/2003 6:38 PM | Joined: Aug 2000 Posts: 346 Shop Shark | | Shop Shark Joined: Aug 2000 Posts: 346 | BrianK,
I believe the center sections are interchangeable thru 1971. There are pictures of this swap somewhere on the SBP.
'38 Chevy 1-1/2 ton
'49 Chevy 1/2 ton
'54 Chevy 6400 2 ton
'55.2 GMC 3/4 ton
'56 GMC 1-ton
No Room Left in Shop
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#34112 03/20/2003 9:29 PM | Joined: Jul 2000 Posts: 504 Member | | Member Joined: Jul 2000 Posts: 504 | The Kook has all the info and pics you need in the technical section on his web page. www.oldgmctrucks.com The page is down now but should be back up in a day or two..
Bill M
53 GMC Hydra-Matic
Home Page
http://home.comcast.net/~bd97/index.html
When you argue with a fool, two fools are arguing..
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#34113 03/20/2003 10:26 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Two options.
To get a 4.10 gear, low dollar swap you can swap the pumpkin out of a 12 bolt 3/4 ton. Jim Carter's old chevy trucks website has a tech tip on this one. You can also get a 3.90 gear set from Randy's Ring & Pinnion to go in the newer pumpkin, but the cost is high.
The other is to swap with a late model 14 bolt full floater differential. They come with 4.54, 4.10, 3.73 gears. You will need to find one the right width on the hub mount surface, and get some late model wheels with a 5 to 5-1/2" setback, as these diffs are around 4" wider than your AD. Most any pickup junkyard will have a selection of the differentials, the wheels are the tough find.
Fred
52 3600
69 C-10
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#34114 03/21/2003 6:48 AM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | The differential can be a bit tricky, too. The 4.11 gear wasn't common until the '67-'72 series 3/4-ton trucks, and even then you might have to do some looking before you find one. I had all but given up, was going to use a newer Dana 60 rear axle, but then my favorite boneyard turned up two of them at the same time. | | |
#34115 03/28/2003 6:27 AM | Joined: Sep 2002 Posts: 115 Member | | Member Joined: Sep 2002 Posts: 115 | Originally posted by Fred T:
...get some late model wheels with a 5 to 5-1/2" setback, as these diffs are around 4" wider than your AD. Most any pickup junkyard will have a selection of the differentials, the wheels are the tough find. Late model (2001-2003) D()dge 3/4 ton wheels have right at 6" backset. On my '52, these wheels on an '80 or so 3/4 ton diff put the tires nicely inside the fenders. I think I could run cable chains. Stock hubcaps can be installed on them after a slight modification. pic of D()dge wheel on late 3/4 ton rear Joe | | |
#34116 03/29/2003 4:05 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Got a picture of the wheels with hubcaps on them?
Fred
52 3600
69 C-10
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#34117 03/29/2003 7:50 PM | Joined: Jan 2002 Posts: 398 Member | | Member Joined: Jan 2002 Posts: 398 | darn, Joe, that setup looks hell-for-sturdy! With the right engine in front of that diff, you could pull down a house!  Might I suggest 500c.i. Caddy? Just kidding-think I remember you posting awhile ago about a late model fuelie or TPI? That's cool! Regards, Wannabe 
"Don't expect anything and you'll never be disappointed"
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