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Mod | | | Forums66 Topics128,135 Posts1,056,423 Members48,441 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2006 Posts: 486 'Bolter | | 'Bolter Joined: Aug 2006 Posts: 486 | A guy on craigslist has a Dana rear axle from an 84 1-ton. I asked for the distance between spring perches and he said it's 40", center to center, which is what I measured on my '57 axle. Does anyone know if there's any reason that this axle won't fit under a '57? He's a couple hours away so I'd like to know if it'll work before making the trip. Thanks for any advice.
Jeff
'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Chances are good the axle is wider where the wheels mount than what you have, making for a wider stance.
If you've checked that and it's not a problem, or you're not worried about that anyhow then it will fit or can be made to fit.
If by chance one of you measured wrong and the spring pad center distance is not the same it's not the end of the world if you have to relocate them.
Have you researched and shopped for a GM 14 bolt rear axle? In my opinion they make a great swap for a 1 ton axle, cheap, easy to work on and get parts, and good selection of gear ratios. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Second on the GM 14 bolt, ff.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Aug 2006 Posts: 486 'Bolter | | 'Bolter Joined: Aug 2006 Posts: 486 | What models and years of trucks would have the 14 bolt rear?
'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | | | | | | Joined: Jan 2015 Posts: 208 Shop Shark | | Shop Shark Joined: Jan 2015 Posts: 208 | I pulled one out of a 93 Suburban, it was 67.5 wide but I have a single rear wheel 1-ton flatbed so the slightly wider stance is fine. I have found 63.5 under a 73 chevy C30 flatbed. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | They are pretty easy to spot on the road to get a good idea of what they came in, look like someone took a bite from the bottom right corner.
ED
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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