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  #16  
Old 10-11-2011, 05:02 PM
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mechmagcn mechmagcn is offline
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Quote:
Originally Posted by crazykooter View Post
Ok bummer guess ill try and find out what year of dana 80's have same lug pattern.
Sucks since I can do the ring and pinion swap myself but they dont sell any gears for this year of axle.

Thanks for the help.
R&Ps are available for these rear-ends. I have bought several from Precision Gear - Dana 80 Ring and Pinion Gear Sets and have had good luck with them. I changed my 90 F450 from 5:13s to 4:30s and still had enuff power to pull a 30' 5th wheel trailer.
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Old 10-12-2011, 11:21 AM
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Quote:
Originally Posted by mechmagcn View Post
R&Ps are available for these rear-ends. I have bought several from Precision Gear - Dana 80 Ring and Pinion Gear Sets and have had good luck with them. I changed my 90 F450 from 5:13s to 4:30s and still had enuff power to pull a 30' 5th wheel trailer.
Are you running 16" tires and a e4od trans ? Where you have the same issue as me with speed to rpm ?
What rpm do you run at 65-70 mph ?
Also thanks for the link. For some reason every site I went to showed only newer ford dana 80's.

EDIT: I just looked at site and it says 92 and up and I have a 91. Gonna have to look into the diff in the axle.
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  #18  
Old 10-12-2011, 01:20 PM
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Quote:
Originally Posted by crazykooter View Post
Are you running 16" tires and a e4od trans ? Where you have the same issue as me with speed to rpm ?
What rpm do you run at 65-70 mph ?
Also thanks for the link. For some reason every site I went to showed only newer ford dana 80's.

EDIT: I just looked at site and it says 92 and up and I have a 91. Gonna have to look into the diff in the axle.
It's been quite a few years since I had the F450 I was talking about, so the details are a little fuzzy I was running a ZF5 and 235-85/R16 tires.
Not sure why the site breaks down the applications like it does, but as far as I know, the rears are the same from 88-98. I think the change then was just a bearing change on the carrier, the gears still remain the same. Other application charts I find have the same Dana 80 for 88-04 F450
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  #19  
Old 07-10-2014, 10:11 PM
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Originally Posted by FORDF250HDXLT View Post
thats what f450's are made for though.hauling,and hauling like they mean it.
those gears are good for that truck imho.i wouldn't change them.
if you find your not hauling the loads that require some low gears,perhaps you don't need an f450?
she's going to feel doggy with 4:10's with a real load on her.what are you hauling mostly? rock/dirt/gravel etc or? hows the truck used?
the cheapest way would be to score a whole rear axle i should think from the salvage yard.......using John's info,look for one with a set of 4.56 gears.any higher than that,then your hauling stuff that a pickup truck could haul,and a f450 is the incorrect rig to have imho.
f450's are not pickups keep in mind.if your getting behind the wheel to drive it anywhere without the intent to make $ with it,you bought the wrong rig or have loads of extra $ just to burn in fuel.
i was mistaken 4 years ago.now that iv gotten an f450 w/ 5.13 gearing,i can attest that these are a bit excessive.surprises me,rather than axle code 72 = 4.63 and code 73 = 5.13 that instead they didn't have 4.30 or 4.56 options.
however......without the turbo and intercooler and maxed fuel screw,then probably working with much less gearing might not have been so enjoyable either lol.
had i left mine n/a i might claim the 5.13's are just right for hauling heavy.since i don't tow heavy (just haul heavy) have her setup with a turbo/intercooler im looking into options as well.
temping it is to simply source axle code 72's 4.63 and simply trade the assembly as this is most often the cheapest.
but ideally id pick 4.30's.
i tell ya,loaded up heavy and being able to remain in OD uphill and even gain speed,is some impressive stuff with the 5.13's though.fun as that may be,she just doesn't need to rev so much.


Quote:
Originally Posted by crazykooter View Post
Are you running 16" tires and a e4od trans ? Where you have the same issue as me with speed to rpm ?
What rpm do you run at 65-70 mph ?
Also thanks for the link. For some reason every site I went to showed only newer ford dana 80's.

EDIT: I just looked at site and it says 92 and up and I have a 91. Gonna have to look into the diff in the axle.
i was just searching and before i ran into this thread,i was checking out general d80 info to learn a bit.it appears pre-92 they had 35 spline axles shafts and 92+ used stronger 37's.

Quote:
When first introduced in the 1988 Ford Super Duty F-350, the Dana 80 Dual Rear Wheel (DRW) axle used 35 spline axle shafts. Effective with the 1990 model year, the axle spline size for Super Duty trucks was increased and the number of splines increased to 37. The 37 spline axle shaft was used on 1990-1991 F-350 and 1992-1998 F-450 models. The E-350 van chassis was available with an optional DRW Dana 80 axle with 35 spline axle shafts starting in 1996. all subsequent 1997-2000 Dana 80 equipped E-series 350 and 450 vans also used 35 spline axle shafts.
http://www.quad4x4.com/ford80r1988-1998.html


Quote:
Originally Posted by mechmagcn View Post
R&Ps are available for these rear-ends. I have bought several from Precision Gear - Dana 80 Ring and Pinion Gear Sets and have had good luck with them. I changed my 90 F450 from 5:13s to 4:30s and still had enuff power to pull a 30' 5th wheel trailer.
is that right? doesn't surprise me.i think that's still plenty of gear without ruining the f450's full capabilities.was yours a factory turbo or n/a?
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Old 07-10-2014, 10:11 PM
 
 
 
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