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dana 70

KidJethro said:
D70HD ring gear is 10.54". 14B is 10.5".

D70HD tube is huge...way bigger than a 14B. 4"

A D70HD shaft is 1.5" 35 spline. 14B is 1.5" 30 spline, however, the pressure angle of the splines on the 14b is different than most any other, which makes up for the 5 spline advantage the 70HD has over the 14B.

A 14B tube is 1/4" thick. All dana axles are atleast 3/8".

This is one area where BillaVista's 14B bible is incorrect. It lists the 14B as having .5" thick tubes. If it did, they would be ungodly heavy.:doah:
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If what you posted is accurate, there is some serious misconceptions in the wheeling world on this subject. Front Dana 60's still have .500" wall tubes right? Can anyone else confirm that FF 14 bolts only have .250" wall tubes?

It just seems that this would have been brought to light a long time ago if the wall thickness was that small. I imagine that there have been tons of people that have narrowed 14 bolts over the years and I would think they would have mentioned the thin tubes on pirate or here. It's a pretty major thing, for it to be unmentioned (at least from everything I have seen) would really surprise me.

I have no doubt that the axle you cut was .250", I just question whether that is how all 14 bolts are :dunno:
 
38377k5 said:
If what you posted is accurate, there is some serious misconceptions in the wheeling world on this subject. Front Dana 60's still have .500" wall tubes right? Can anyone else confirm that FF 14 bolts only have .250" wall tubes?

It just seems that this would have been brought to light a long time ago if the wall thickness was that small. I imagine that there have been tons of people that have narrowed 14 bolts over the years and I would think they would have mentioned the thin tubes on pirate or here. It's a pretty major thing, for it to be unmentioned (at least from everything I have seen) would really surprise me.

I have no doubt that the axle you cut was .250", I just question whether that is how all 14 bolts are :dunno:
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The 14BFF's I have that are cut off for the same purposes are thicker than .25". Closer to half inch at the pumpkin and .375 further out. Just my experience with the two that I use for setup purposes. It is possible that they could continue to taper thinner further out.
 
The one in my pictures was cut about 2" from the diff. I left enough tube for a jack stand to support it. I've cut apart several and found .250 wall tubes right at the diff. WFO Concepts is also just down the road and while talking to Trevor one day, he mentioned that every 14b he's welded new perches, shock mounts, link mounts etc onto has warped a noticeable amount. A .5 wall tube would not warp a noticeable amount from just welding a spring perch on. Not to mention, as an experienced welder, you can tell how thick something is when you weld on it. I'm sure Kert will back that up...as much welding as he does. I know I can tell the difference between .25 wall tube and .5 wall tube by nothing other than running a bead on it. During my "welding career", I've run beads of some kind on many different 14b's. I have never gotten the impression that I was welding on something that thick. It is a fact that not all 14b's have thick tubes, I would say that the ratio is pretty even. I dunno....maybe it has somthing to do with weather the truck it came from was 3/4 or 1 ton. Maybe the older ones have the thin wall tubes and the newer ones get the thick wall. If your curious what you have....drill a tiny hole in the tube to find out. A tiny little spot weld will seal it back up.:wink1:
 
KidJethro said:
The one in my pictures was cut about 2" from the diff. I left enough tube for a jack stand to support it. I've cut apart several and found .250 wall tubes right at the diff. WFO Concepts is also just down the road and while talking to Trevor one day, he mentioned that every 14b he's welded new perches, shock mounts, link mounts etc onto has warped a noticeable amount. A .5 wall tube would not warp a noticeable amount from just welding a spring perch on. Not to mention, as an experienced welder, you can tell how thick something is when you weld on it. I'm sure Kert will back that up...as much welding as he does. I know I can tell the difference between .25 wall tube and .5 wall tube by nothing other than running a bead on it. During my "welding career", I've run beads of some kind on many different 14b's. I have never gotten the impression that I was welding on something that thick. It is a fact that not all 14b's have thick tubes, I would say that the ratio is pretty even. I dunno....maybe it has somthing to do with weather the truck it came from was 3/4 or 1 ton. Maybe the older ones have the thin wall tubes and the newer ones get the thick wall. If your curious what you have....drill a tiny hole in the tube to find out. A tiny little spot weld will seal it back up.:wink1:
Click to expand...

I'll have to shoot a couple pics at the shop when I get in. Nice little snow storm hear today. I have cut them apart further from the housing but can't say as I paid much attention to the tube thickness at those distances from the housing. Your photo does look much thinner than what I recall. 3/4 ton may make a differnce as well. Who knows. GM has done some strange things over the years.
 
OK, sorry for the high jack and all since this thread was actually about the Dana 70. Just wanted to put it back where it was being discussed.

This measurement is right on the edge of the punkin'. 14BFF out of a 3/4 ton. I also took a measurement on a spindle I have cut loose, approx. 1" behind the brake flange. It measured .300" +/-.

These measurements were double checked against a second axle and were the same +/- a few thou. Also a 3/4 ton.

Kidjethro, if yours are .25" tell GM you want your money back!:haha:


axletube1.JPG
 
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