Lets talk F-superduty's...

[whitehorse]

Ok so my neighbor has a 90 model with 7.3 and e4od and 5:13 gears....he wants 4:10 gears, do they make that gear for them? Is a dana 80 all the same... if they are maybe he can get some gears out of a dodge. I think he just needs to sell it to me....

 

[towcat]

not so easy.
the lowest a 5.13 housing can go is 4.62.
anything smaller requires a housing swap.

 

[whitehorse]

Sorry towcat but you will have to school me on this....why a housing swap? The ring and pinion smaller?

 

[79jasper]

Yeah.
Maybe someone will know for sure, but I think you can get higher gears for the newer 450 and 550 axles.

Sent from my SM-G900R4 using Tapatalk

 

[towcat]

Sorry towcat but you will have to school me on this....why a housing swap? The ring and pinion smaller?

not smaller. although the pinion gear is smaller in diameter and the ring gear carrier must move more to the centerline of the carrier and that will require a axle housing that can compensate for the difference in location of the ring gear.

 

[whitehorse]

So... no go on a 4:10 ring and pinion swap...without a axle swap..not good...I guess he could run a taller tire...

 

[79jasper]

Or a overdrive unit.
Could nearly be done for the same price as the other options.

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[kuskoal]

So what is the difference in housings of this particular dana 80?

Same issue like a dana 60 and a dana 61?

I like knowledge.

 

[towcat]

So what is the difference in housings of this particular dana 80?

Same issue like a dana 60 and a dana 61?

I like knowledge.

do some research then.
getting knowledge is one thing, getting spoonfed knowledge is only cheating yourself.

 

[FORDF250HDXLT]

someone on FTE (in the 94-97 psd section) had just swapped in a set of 4.10's in his (then they sold the truck) according to him anyway.it looked as if they did the job themselfs iirc.

i called up a local trans/diff specialty shop (twice now!) for a quote to get a set of 4.30's swapped in place of my 5.13's but they didn't call me back yet after either of my calls.i dunno whats up with that yet.i'v got to try again Monday.speaking of which iv got to get after the local welding/fab shop again too.trying to get people to do something for ya around here has been like pulling teeth for me lately.

 

[whitehorse]

4:30's would be good if it will work but towcat is saying a housing swap would be in order...

 

[FORDF250HDXLT]

4:30's would be good if it will work but towcat is saying a housing swap would be in order...

i don't personally know either way brother.im a shade tree mechanic at best.most of the detailed specialty things such as these are beyond my skill level (and time to learn them anyway.) here is the thread:
http://www.ford-trucks.com/forums/1301395-f-sd-4x4-conversion.html

as you can see,he had the 4.63 gears.perhaps the 5.13 uses a different housing than that of the one with the 4.63's.i don't know.

i did find out that i can grab a 4.63 dana 80 of the same year for about 7-800 shipped from a salvage yard.the $ didn't seem worth the effort to me to get only a slight different ratio at least not with a perfectly good d80 already.i figured for this coin,or close to it a local shop could give me 4.30's.......but i still don't know for sure cus they haven't called back lol.

i think 4.30's would be perfect for such a big truck with the turbo and intercooler.mine runs the same loaded as it does empty with the 5.13's.she'll gain speed uphill floored while in OD! haha!

if i kept her n/a i think the 4.63-5.13's would be good to have though.as n/a she sure dropped off the speed just running empty on the way home.......but it did need a set of injectors to be fair.

 

[towcat]

here's a hint to save you a ton of heartache.
before you go ordering parts for your Dana 80, get the build numbers off the axle tube on the passenger side tube between the shock mount and the carrier housing.
****warning***** Dana 80's made for Ford F450 Superduties from 1988 to 1997 are very different from ANY OTHER MAKES.
many parts do not interchange. I do not do my own rearend work. It is farmed out to a shop around the corner from me and it's known as "Rearend Specialties". The original owner and I have been friends since 1987 when I was still racing my Buick. That car was almost impossible to get rear axle parts for. When I got into F450's I already knew what I was up against in modifying gearing.
There are many armchair mechanics who will tell you anything you want to hear. I have learned many of my lessons by actually ordering parts that had a one-way ticket. If it didn't' fit, I got stuck with it.
The reason why you see so many armchair mechanics tell you good stories, is because of the hybrid dana 70/80 rearends found in many dodge pickups from 1994-2001. they do have the numberically lower option, BUT nothing will easily interchange between the Ford and the Dodge.
Now don't get me wrong. I'm not saying that it is impossible. Anything is possible if you want to spend some serious $$$$$$.
certain E450 dualies have the gearing package you are looking for and with two extra bonuses. one. a bolt patter identical to your pre '99 8-lug wheels! two. disc brakes with intergrated emergency brake. modifications must be made in locating the spring pads and shock mounts.
Rich/94f450sd has installed the F350 version in his truck and is a real life example that this does exist and does work.
if you own a F450 and are willing to travel to obtain a axle to experiment on, I have six of them that I am willing to part with at scrap metal prices since that is what they will be worth at the end of 2014 in kali. contact me if you are serious in wanting one. this is for pick-up only. I do not have the time or energy to pallet up these for shipping. please don't ask.