I-beam strength ?

[sweetk30]

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i have a idea on a item to make and sell in a limited special use environment line of work . not for every day type stuff use .

we know our 3/4ton - 1ton ff rears are strong . but does anyone know the full weight capacity of these axles ? I know there limited mostly by the leaf springs under the truck .

my idea would be to go junk yard hunting and score a few dana60/70 14ff style axles to use for my project . then cut the ends off at the center section . then insert the tubes/spindles inside a bigger tube of good thickness and weld it up to the correct width .

what do you guys think these axles would hold if made like this ? I was figuring with the gvw of a lot of these trucks in the 8-10k range the rears would be in the 8k range easy like this .

thanks for any help you might have on this idea.

internet search Wikipedia shows this info:

14ff corp 10.5 ring gear

GAWR: 8,600 pounds (3,900 kg) Max.

dana 60 rear

GAWR: 6500 lbs

dana 70hd rear

GAWR: 10,000 lbs

reg dana 70 rears

average is GAWR 7500 lbs

 

[obijuank5]

I am pretty sure the 14 bolt hubs fit on dana 80s. What are those rated at? What's the bearing interchange on 10 lug dana 80s?

 

[sweetk30]

my info above would lead me to be safe with 14ff stuff and much easier to find here in the yards .

 

[obijuank5]

I was just leading to the same bearing and spindle design potentially being used on 10k for sure and maybe higher. Even then I'm sure they are under rated. 4" tube from a 70hd is probably easier to work with than the irregular tubes from a 14 bolt.

 

[sweetk30]

ya but i have only seen 3-4 70hd rears over the years . but 14ff are all over up here still .

 

[diesel4me]

Years ago a lot of guys wanting to build car trailers for stock cars and dirt track racers used 3/4 or 1 ton full floating diffs,we sold many from dually pickups to them,some used the rear diff from an old school bus--they would cut off the axle tubes with a pipe cutter,and insert then into a schedule 40 or 80 pipe with the closest inside diameter to widen them, and weld them up...never heard of any failing,and they often overloaded the crap out of their trailers..

 

[sweetk30]

so you have a 15" tall I-beam that's 5" wide on the flats and 3/8-1/2" thick .

you want to cut 2 4" holes in the beam . 2 inches up/down from the flats and 4-5" in the middle of the 2 holes. then pass the 4" pipe 1/4" wall threw it .

the beam will be 5ft or so long and 2 sets of 4" holes 2 at each end around 1ft or so in from the ends .

will this make the beam weak " or should it be no problem ?

 

[vandelay industries]

Years ago a lot of guys wanting to build car trailers for stock cars and dirt track racers used 3/4 or 1 ton full floating diffs,we sold many from dually pickups to them,some used the rear diff from an old school bus--they would cut off the axle tubes with a pipe cutter,and insert then into a schedule 40 or 80 pipe with the closest inside diameter to widen them, and weld them up...never heard of any failing,and they often overloaded the crap out of their trailers..

You mean get rid of the center section and then put a "sleave" over the two axles"?

 

[diesel4me]

Yup...just ditch the diff part and weld the axle tubes together with the schedule 40 or 80 pipe...some guys drilled the tubes for a pipe plug and filled them with gear lube,others opted to use wheel bearing grease instead on the bearings..
A lot of home made car trailers were built that way around here..some guys who had used mobile home axles had to get rid of them after the DOT stopped them and told them they were for "temporary use only"...not rated for their purposes,so they went with this method to replace the axles..