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Old August 30th, 2010, 02:56 PM   #21
Jeeperz Creeperz
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Originally Posted by blue_toy View Post
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

26701x is the Dana part number for a limited slip case.

The Power-Lok is a split-case 4-pinion limited slip. The Trac-Lok is a 2-pinion one piece design. Looking at the picture, you have a Power-Lok.
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Old August 30th, 2010, 03:09 PM   #22
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Yup power lok diff. yes the 60 and 70 use the same size pinion spline/yokes. You have to bump up to a 80 to get a larger pinion stem.
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Old August 30th, 2010, 03:36 PM   #23
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Thanks guys..............so with aggresesive driving whats the biggest tire one could expect to hold up.........I know pretty its a open end question.....I run 40's on toyota and am breaking stuff.....only one rear stock so far and twisted Longs....but i kinda baby it.....i want "to beat on" something .....sound familiar Erin

Anyone running this gear set with what tire and good results?

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Old August 30th, 2010, 05:08 PM   #24
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Locker is definately a powerlock, which is not a true locker. But as I said before, the heavier oil you run in it the tighter it will get. I've also heard about people putting an extra disc in these to way tighten them up, but I've never tried that.

If you got 4 inch tubes, you probably do have an HD.

The powerlock that you have will work with all ratios 4.56-7.17. Not to hijack your post, but I've got at least one set of 4.56 gears I'd let go cheap.
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Old August 30th, 2010, 10:04 PM   #25
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Originally Posted by keithshotrodshop View Post
Locker is definately a powerlock, which is not a true locker. But as I said before, the heavier oil you run in it the tighter it will get. I've also heard about people putting an extra disc in these to way tighten them up, but I've never tried that.

If you got 4 inch tubes, you probably do have an HD.

The powerlock that you have will work with all ratios 4.56-7.17. Not to hijack your post, but I've got at least one set of 4.56 gears I'd let go cheap.
Well if you had two cheap I'd consider them......i wil keep them in mind...not sure what to do yet....really want to run a 44" or better....

any idea how the powerlock holds up to abuse?
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Old August 31st, 2010, 10:02 AM   #26
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Well if you had two cheap I'd consider them......i wil keep them in mind...not sure what to do yet....really want to run a 44" or better....

any idea how the powerlock holds up to abuse?
I've never done any serious wheeling with a powerlock, but from what I hear they hold up well under stockish horsepower. I know some local guys that run them in their big mud trucks with 44 boggers, but they usually only get a season or two before they have to rebuild them. These guys are running 600 horse big blocks though.
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Old September 3rd, 2010, 09:46 PM   #27
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Well i've decided to sell these if anyone is interested $550 call 616-886-1869

changing directions
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