Today I came across a dana 70U and i was told there is also a dana 70 HD and a 70 st and another one. Is the 70u necessarely weeker than the others and isnt it still stronger than the Dana 60?

a dana 70 u is a 60 in disguise it uses all the same bearings as a dana 60 with the exception of the inner pinion bearing diameter

been looking for a 70u for my dodge dually! Is it for sale, what gears ,dually?

dont forget the 70u has a stronger ring gear and all have FF 35 spline axles.

I have seen a 31 (or was it 32?) spline 70U. They sure as hell weren't 1.5" shafts. It had the big bearings also. U2A maybe???

never seen or even heard of a non 35 spline 70. guess i could be wrong:confused: i had a 70u in my heep and it was sure as hell 35 spline:D

cummins dodge 70 is 32 spline

Can't speak for all 70U's but mine came from a '80 F-350. 10.5" ring gear, 35 spline 1.5" axle shafts, and the bearings were larger than those used in 60's. Certainly NOT a 60 in disguise!
:flipoff2:

Originally posted by Ultim8kaos
Can't speak for all 70U's but mine came from a '80 F-350. 10.5" ring gear, 35 spline 1.5" axle shafts, and the bearings were larger than those used in 60's. Certainly NOT a 60 in disguise!
:flipoff2: well then you didnt have a 70 u then im sorry to say :D :flipoff2:

cummins dodge 70 is 32 spline you obviously dont know dodge or spicer very well. ALL are 32 spline?;)

never seen or even heard of a non 35 spline 70

ALL are 32 spline

you are going to have to elaborate on these 2 seemingly contradictory statements that it appears were both typed by you.

I have never met Dodge or Spicer so cant say I know them at all.
I do own a d70 and it has seen a shitload of my $$$ to regear it to 4.88 and add a detroit locker and convert from 32 to 35 spline dana axleshafts

I used a Dana 70 from a '91 Dodge SRW Cummins for my HP D60 project. Lobbed off both ends and reused the shafts, she was all 35 spline.

MT

mine was 90 or 91 srw as well

So, what is this axle IF NOT a 70 U? BOM 605205 :flipoff2: :D

um notice the question mark smartass? i'm asking you. i've never SEEN a 32 spine 70u, but hey, you wrote the book on 70u's. sorry dude:rolleyes:

70's are not all 35 spline. Older ones are 23 spline x 1.5".

Tim.

Originally posted by WOLF359
70's are not all 35 spline. Older ones are 23 spline x 1.5".

Tim.


yes thats true. and a good point. do you know why a 35 spline axle is stronger than one the same thickness thats only say 23 spline?

OK, I'll play, why is an axle shaft with 35 splines stronger than one with 23 or so? :D
Actually I think it has to do with the fact that 35 splines will have more surface area than a lesser spline count. Enlighten me if I am wrong. :flipoff2:

Surface area is part of it. Also the coarse splines are cut deeper, so the minor diameter of the splined shaft is reduced.

never thought about that part of it Llyod. :D

Lloyd is correct!:flipoff2:

Thank ya, thank ya vary much! :p

Originally posted by WOLF359
70's are not all 35 spline. Older ones are 23 spline x 1.5".

Tim.

Dana 70 23 splined 1.5in diamater on left.
Dana 60 30 splined on right.

Id go 23 splined d70 over 30 splined d60 pic..

Not my pic, Its pirated......:D

Good point Lloyd, I forgot about that! :D

For those of you who have (or have had) a 70 (or 70U) would you please post what year and model the donor vehicle was?

Or, more to the point, what should be under a '90 Dodge SRW pickup with a Cummins?

Originally posted by Lloyd
For those of you who have (or have had) a 70 (or 70U) would you please post what year and model the donor vehicle was?

Or, more to the point, what should be under a '90 Dodge SRW pickup with a Cummins?

Ok, as for dodge rear 70 goes, I would say by looking at this current Dana/Spicer general information book I have in front of me.
From the 1970s through 1990 "all" the Dodge 70 rear axles were 1.5" 35 spline. Then in 91 through current the 70 rear axles are 1.37" 32 spline.
As for Dana 70 axles their is many models
70
70U
70B
70HD
70-2UA
70-3HD
Many of these axles have problems and differences,
limited gear selection
23 spline axles
non interchangeable pinion lengths
pinion offsets

THEY ALL ALMOST LOOK THE SAME,
The HD is bigger and as far as I can tell too big. The 70HD case is big (ground clearance, weight).
NOT ALL 70S ARE COOL!!!!!!

WHEN SHOPPING AT FOR A USED ONE YOU BETTER CHECK THE BILL OF MATERIAL NUMBER FIRST BEFORE YOU GET A BOAT ANCHOR.



Theadvantage of the 70 is 10.54 ring gear and the 1.5" shafts. It only looses 5/16" of ground clearance to the 60 . I had one
in a fullsize Chevy weighing in at close to 7000lbs, 454, 7:17 and LOVED it. The axle was 20plus years old and I only broke one shaft. It was abused. I never broke a ring and pinion in the 70 (broke more than I could count in the ft 60).
If you can find one (a good one) you have a winner! I personally Dont care for the 14 bolts, (yes they are cheap, and tough) But with out shaving one, it will be a shovel. And whats up with the limited 5.13 gears? The gear selection is wide open for the correct 70.

Get The Bill of Material # and e-mail me and I will look it up.
Dan

my old 70u was from a '82 2wd 3/4 ton ford extended cab truck. had a nice smooth housing, 35 spline axles and the added area around the cover meant no grinding on the cover to keep it from peeling off.:D

Originally posted by horse_with_no_name
been looking for a 70u for my dodge dually! Is it for sale, what gears ,dually?

sorry horse i dont think im gunna sell it I need it for my Jeep. And its not a dually axle anyway.

I got this dana for free so im really hoping I can use it on my Jeep. It came out of a 85 ford f-250 diesel. And supposubly when my dad bought the truck it had the one ton axle on it. Ford tryed to tell me it was a dana 60, but Randy's Ring and Pinion told me it was a 70u and that i would have to check the spline count to tell excactly what gears and locker would work in it. does it sound like its worth doing?

Originally posted by Lloyd
For those of you who have (or have had) a 70 (or 70U) would you please post what year and model the donor vehicle was?

Or, more to the point, what should be under a '90 Dodge SRW pickup with a Cummins?

The one I have is from a ...
FORD Model 70 REAR 1981 - 1985 E-350 DSO - 70HD
BOM# 605053 35 spline FF


http://www.monsterslayer.com/jeep/TJCrawler/Dana70.jpg

http://www.monsterslayer.com/jeep/TJCrawler/D70SpindleHubBrakes.jpg

Jofear- If you want this housing after I take off the spindles just come to Farmington during the SuperCrawl and take it home to CA with ya ...:p

Thanks for the response, guys. Looking at some data I found, it seems that the 70U has a different carrier than a straight 70 (not just difference in spline count) and that there is also a run of straight 70's with the 32 spline shafts. It looks like there are ca. half a dozen different setups, only considering 70 and 70U axles from a short time span and single application. :eek:

Dan,

Thanks for the offer to look it up, but I got that taken care of last night and came to the same conclusion you did - straight 70, 1.5" 35 spline. :) If you could summarize the information in that book you cited and submit it to Lance (probably merits a separate tech. article) I'm sure a lot of people would find it interesting and useful.

[i]
Jofear- If you want this housing after I take off the spindles just come to Farmington during the SuperCrawl and take it home to CA with ya ...:p [/B]

Hey that could work its just the housing? Will anything else cool be on it when your done? either way sounds good if your serious buy the way when is Farmington?

Originally posted by joefear7


Hey that could work its just the housing? Will anything else cool be on it when your done? either way sounds good if your serious buy the way when is Farmington?

SuperCrawl is Oct 11-12
I'm going to chop off the spindles just inboard of the flanges.
Goodies? Oh, yeah ... a thin diff cover ... :flipoff2:
But the caps and the pinion race and seal seat look good ...
Offer goes to horse_with_no_name ... or any one else.
First come, first serve ... free.
My stock wheelbased Jeep will be better served with a high pinon diff as I'm shooting for Stock Modified class 35s" treads.

Finally pulled my 70U apart and found that it is a 35 spline. I also found out that it has a limited slip. So im thinking its gunna work on my Commando.

LLOYD MY GUESS IS THAT A 90 SRW D250 HAS A D61 WITH 3.07 GEARS, THATS WHAT I PUT UNDER MY D350 TO REPLACE THE GRENADED D70U WITH 3.54 GEARS. IF THE SRW D250 REAR END HAS ONY OTHER COMBO OF GEARS I COULDN'T TELL YOU WHAT REAR END IT IS, BECAUSE THE D61 ONLY CAME WITH 3.07 GEARS DUE TO THE PINION BEING OFF-CENTER FOR THE THICKER RING GEAR. BREAK A 61 AND YOUR SCREWED IT WAS ONLY AVAILABLE FOR 2.5 YEARS (CUMMINS W/O OD TRANS 1989-1991.5), ALL SOURCES I HAVE TRIED CAN NOT GET A NEW GEAR SET!!!;8TR SCOTT

Originally posted by MT
I used a Dana 70 from a '91 Dodge SRW Cummins for my HP D60 project. Lobbed off both ends and reused the shafts, she was all 35 spline.

MT

I'm going to use D70 spindles on my RR60 center plus use the OEM 35 spline 70's shafts if I can get them cut down.
I don't know enough about the different way splines are made ...
The stock spline's grooves seem to be pressed (rolled?) in, raising the peaks of the "teeth" well above the diameter of the shaft.
Can these be cut down and the same process used to make splines in them like the way they came or do I have to get custome shafts made?
Sorry for such a basic question but I don't know the difference between "rolled" , etc ...

Horse - I posted some more info I'd learned since this thread in response to another question in the Dodge section: http://www.pirate4x4.com/forum/showthread.php?s=&threadid=72997

For a 61 you CAN get gears, and can use any standard D60 locker with the 4.10-down offset. Besides the R&P all the parts are standard 60, and you can run a standard D60 gearset with a spacer, if so inclined. If you want gears, or more information on these, talk to Bryce (ext. 5561) at Randy's Ring & Pinion (800-347-1188). He's been very pleasant, knowledgeable and more than willing to pull the books and look up what will work and what won't. D61 gears are available in 4.10's at least.

For the oddball 70 (not 70U) with 3.07's and deep pinion offset there is a special combination of Detroit and 70 gears that will get you to 4.56. These have a carrier with a unique offset, so it isn't straightforward to change the R&P without changing the carrier - perhaps a spacer would work as with the 61, but I haven't been able to find that documented anywhere.

Jaffer; to the best of my knowledge the only aftermarket axle co. to roll splines is Superior, and I'm not sure that they'll respline yours. Wouldn't hurt to ask. All the rest that I know of cut the splines; if this is really the case, you'll need new shafts if they're smaller in dia. than the spline OD.

Ok, so what would be the best 70 for me:
I want the strongest bearings and hubs with 35 spline 1.5" shafts and able to put 5.38s and a locker, detroit or ARB or spool, Sing wheel. And what vehicle can I find it in? And whats the width? Thanks

Originally posted by fjcruiser
Ok, so what would be the best 70 for me:
I want the strongest bearings and hubs with 35 spline 1.5" shafts and able to put 5.38s and a locker, detroit or ARB or spool, Sing wheel. And what vehicle can I find it in? And whats the width? Thanks Sorry dude, no 5.38 or a spool for the dana 70. steve Differential eng. inc.

ok...so any ratio close

Jaffer; to the best of my knowledge the only aftermarket axle co. to roll splines is Superior, and I'm not sure that they'll respline yours. Wouldn't hurt to ask. All the rest that I know of cut the splines; if this is really the case, you'll need new shafts if they're smaller in dia. than the spline OD. [/B][/QUOTE]


I have a 70 that was given to me, has bad housing, early 90s' rental ton dually van and spun carrier bearings.
I am going to use the spindles and hubs on my HP 60 due to better match of tube size from backing plate brackets to spindles.
Anyway I wanted to use the axles, they are the 39 3/4" long, figured a good set to cut. When I miked them, the splines are 1.485" and the shaft is 1.440". I called Dutchmans just out of curiousity, and like you said above, if you don't have an 1.50" shafts, they can't respline them. Think I'll look around a bit for some from a dodge or othertruck, see if the shaft is 1.5", if not I'll get a set of there custom flanged floater axles.
Has any one else miked there 70 shafts to make sure they are 1.5". Andy