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Old August 27th, 2010, 11:50 PM   #1
blue_toy
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Default dana 70 hd - need info

So i picked up a pair of dana 70hd axles out of a case trencher. My plan is to use one for a front and one for a rear on a buggy i'm SLOWLY building. Looking for some info, i pulled the axles and covers.....didn't figure the ratio, but believe its a 6:68 to 1 (668 stamped on the ring gear)....

They have 1.5" 35 spline shafts

I believe a govt locker or similar, see pics

4" tubes

6 studs on axles flange

Does anyone have any experience with these?

How strong is the locker?

want to run 47"-54" tires with HP (eventually 500+)

I plan on making a front with good 60 outers and use 4340 shafts......i will more than likely slide 3" tubes inside the 4" to work with 60 outers

Are the spring perches on trenchers usually on top or bottom, how do you tell the direction of the axles....it seems these were run upside down??? like a high pinion. the perches seem to be on the top side of the axles??

here's some numbers on the ring gear:
668 12 0790 Dana D 3 5 307 P8R 25 43 8

Any input is always appreciated. Thanks Mike........

And YES i've already searched and found some info, mostly on Pirate...just ooking for more.

Last edited by blue_toy; December 17th, 2010 at 07:17 AM.
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Old August 28th, 2010, 08:38 AM   #2
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1) take the last two numbers on the ring gear and divide which comes out to 5:38 (I didn't think they existed though)

2) not gonna keep these alive with that tire size.

3) never made a Hp 70 till the late model kodiak/topkick stuff and they look more like a dana 80
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Old August 28th, 2010, 08:58 AM   #3
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I bought 8 of these in wisconsin for a parts a few years ago. There are still a couple of the housings and shafts in my junk pile. They were out of Case's as well. Mine were 7.17 gears, which looking at the thickness of the ring gear, you have the same. They also have powerlock lockers, which is what you have. The powerlock is a very tight limited slip. If you run 120 weight gear oil in them, it's very hard to see a difference between them and a detroit. Yes, they were run upside down.

They are not Dana 70 HD axles. They are standard dana 70s, which should be confirmed by the large letter B cast into the housing. Your tire size idea is a bit much, as these are basically just standard 35 spline dana 70's. 44's are about as big as you'll be able to go.

The small tubes will fit inside 4 inch tubes, but they are a bit loose. You'll have to shim them somehow. I had the parts sitting around to turn one of these into a front as well, but decided against it.
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Old August 28th, 2010, 01:27 PM   #4
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i believe u can buy new inner "c"s from balistic bored for whatever tube u need them
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Old August 29th, 2010, 11:08 PM   #5
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Thanks for the info....

They do have on the housing 70HD in the casting...see pic

Is it a bad idea to run them upside down? This would mean the front axle gears are stronger running on the front side of the gear and the rear would be weeker running on the back side??? would the rear gear set be stronger than a dana 60 rear?

This is a offroad only buggy build.

I will hopefully put RCV axles in front if i can get enough$$$ together

still not sure on the gear ratio..... 5:38 would be fine as would the 6:68....7:17 i guess are fine....if they are 7:17 gears does the pinion gear get to small and make it a weak ratio?
the 668 were stamped by hand in the gear....does this mean anything?

I could live with 44" tires but want to go as big as my drivetrain will take......and i do want to seriouly abuse this thing!

I have to weigh the cost of buying a used front 60 and using parts or buy inner c's as suggested and all other needed parts......

thanks again for the info

Last edited by blue_toy; August 26th, 2011 at 09:46 AM.
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Old August 30th, 2010, 09:16 AM   #6
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They are not 6.68 ratio, guaranteed. The only ratios every available for ANY dana 70 are 3.50, 3.73, 4.10, 4.56, 4.88, 5.13, 5.38, 6.17, 7.17

For a buggy, you could run them upside down, but only if the motor is in the rear, if you use them upside down in a conventional layout, it will be driving backwards. In the tractors, they were used in such a low speed situation that the pinion never had a chance to get hot. Every one of these I dismantled looked like it had been put together the day before, so I wouldn't be worried about the condition of your axles.

The pic of the HD you are referring to doesn't convince me that these are HD center sections. I think that might be someone elses stamp for different reasons. The only difference between an HD70 and a standard is the size of the carrier bearings, and to my knowledge, the HD70 was only used in chevy dually applications. That doesn't mean they couldn't have used them in your's though.

The HD70's that I've had have had no stamp on the housing like yours. The tubes were just massive.

On the ring gear there should be two numbers next to eachother, towards the end of the stamping. They will not say the ratio, they will say the ring, then the pinion, for example - 41 10. You then take the higher number and divide the lower number into it, it will give you the ratio. The hand scribed number you are referring to as 668 is most likely the assemblers ID number.

If you still can't figure out whether this is a true HD or the ratio, pull it apart and count the teeth to figure it out. While it is apart, measure the carrier bearings to see what diameter they are, then you'll know if it is an HD or not.

As for the pinon, yes it gets very small in 7.17 ratios, but I've never heard of anyone breaking them.
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Old August 30th, 2010, 09:23 AM   #7
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I have never seen 5:38's for a dana 70 but might be a rare set, and 5:86 was another option missed.

the 70hd did use the 4" tube as he started these had, all others were the 3 5/8" tube.
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Old August 30th, 2010, 09:36 AM   #8
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Quote:
Originally Posted by Jeepaholic View Post
I have never seen 5:38's for a dana 70 but might be a rare set, and 5:86 was another option missed.

the 70hd did use the 4" tube as he started these had, all others were the 3 5/8" tube.
You're right, I forgot about the 5.86s, The 5.38's are indeed a rare set. When I regeared my high pinion 60 and standard 70, I wanted to go that route. I found the 5.38's through one place (randy's I think) but everyone was back ordered on the high pinion 60 5.38's, and I was told it would be 3-4 months to get them, so I settled for 5.13s, which isn't much a difference. Then a few years later I was going to re-gear another set, and found I could get 5.38 high pinion gears all day long but nobody carried the 5.38 dana 70 gears any more!
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Old August 30th, 2010, 09:44 AM   #9
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mike you know how many 7.17 pinions luke has went threw.so yes they do break.look at the pinion in it mike, is it small?if it is then it is 7.17 gears.
looks like a hd to me.
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Old August 30th, 2010, 10:10 AM   #10
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Quote:
Originally Posted by liv2mx View Post
mike you know how many 7.17 pinions luke has went threw.so yes they do break.look at the pinion in it mike, is it small?if it is then it is 7.17 gears.
looks like a hd to me.
If they are 7.17 they will not hold up as stated, especially with the tire size in mind. I have a 1982 Chevy dually 70HD housing in my backyard, I will try and get some pictures at lunch.
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Old August 30th, 2010, 10:31 AM   #11
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I will probably tear them down to find out the ratio if i can't make sense of the numbers.......maybe i'll stay with smaller tires for the time being....these were to cheap to pass. I can't see much with that locker in the way to see the pinion size

Any body have experienc with the Power Lock strength?? or traction characterisitcs?? I like the idea of 140 weight making it work better, don't want to pay for a detroit locker....are they weldable??

I kinda thought i would have to run a rear engine config. to run them upside down, so thats out for now.

Thanks Again for all the input ....I will let you know when i figure out more
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Old August 30th, 2010, 11:04 AM   #12
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Quote:
Originally Posted by liv2mx View Post
mike you know how many 7.17 pinions luke has went threw.so yes they do break.look at the pinion in it mike, is it small?if it is then it is 7.17 gears.
looks like a hd to me.
Didn't Luke run 60's??

Quote:
Originally Posted by BigBlockBlazer View Post
If they are 7.17 they will not hold up as stated, especially with the tire size in mind. I have a 1982 Chevy dually 70HD housing in my backyard, I will try and get some pictures at lunch.
These are a raised letter (70HD) in the bottom corner of the casting, i'm curious if yours are the same?

Thanks
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Old August 30th, 2010, 11:06 AM   #13
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yep.
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Old August 30th, 2010, 11:07 AM   #14
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i know some guys put washers in the lock on a 14 bolt to make it a posi.think it would work with this.
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Old August 30th, 2010, 11:20 AM   #15
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I have an old closed knuckel front 70 with 4.88 gears that I was planning on making an open knuckle with 60 outers. The tubes neck down right were they meet the "ball and socket" and if that diamter didn't work I was planning on boring the 60 knuckles to accept the 70 tubes (I dont believe they are 4" diam on the closed knuckle)


I'd be interested in selling the 70, the 60 parts too if your interessted.
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Old August 30th, 2010, 11:51 AM   #16
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Quote:
Originally Posted by halfgassed View Post
I have an old closed knuckel front 70 with 4.88 gears that I was planning on making an open knuckle with 60 outers. The tubes neck down right were they meet the "ball and socket" and if that diamter didn't work I was planning on boring the 60 knuckles to accept the 70 tubes (I dont believe they are 4" diam on the closed knuckle)


I'd be interested in selling the 70, the 60 parts too if your interessted.
I may be interested in the 60 parts as i want to do the same.....to early to say what I'm doing....still trying to figure out what i have
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Old August 30th, 2010, 12:59 PM   #17
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This is a 70HD out of a '82 Chevy 3+3 Camper Special dually - 4" tube. It's for sale also if you need it.

D70 rear - Great Lakes 4x4. The largest offroad forum in the Midwest

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Old August 30th, 2010, 01:53 PM   #18
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here's some numbers on the ring gear:
668 12 0790 Dana D 3 5 307 P8R 25 43 8



I'm assuming theres quite a gap in all the numbers especially after the p8r 25

Usually the gear ratio is stamped in the form of number of ring gear teeth and number of pinion teeth. Just about every axle I've ever decoded has been this way and the actual numbers are farther away from the rest of the stampings (roughly 1/2") If this was me I'd say 5.38's, look at your last 2 digits (43 teeth on the ring, 8 on pinion, just do the math)
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Old August 30th, 2010, 02:39 PM   #19
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Well i went home at lunch and double checked the ring gear number.......the 8 after cleaning the oil off better appears to be a 6, my bad

so my correct numbers on the ring gear:
668 12 0790 Dana D 3 5 307 P8R 25 43 6

So its a 7.17 gear.....i could put some other gear set in as they are available per Randy Ring & Pinion

I also found that it has a 5/8" offset ring gear

I'm told the pinion shares the same shaft diameter as a dana 60 - 1 5/8" weak point

So I have a 70HD, 4" tubes, 7.17 gears, 35 spline 1 1/2" shafts with most likely a Power Lock, I'm told it could also be a Trac lock or True Track posi of sorts

Does 7-28-89 2670i-X on the locker mean anything to anyone other than a date

Thanks for all the input

Last edited by blue_toy; August 26th, 2011 at 09:46 AM.
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Old August 30th, 2010, 02:54 PM   #20
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Tru Trac will be all gear driven, no clutches.
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