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Old 09-16-2004, 03:46 PM   #43
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Hey all
Sounds like alot got cussed and discussed while I was solving the rearend mystery to my tow vehicle. Thanks "toaster" for the ColoradoK5 web site. I was able to identify the axle on the burb. Its a dana 70. You were correct also in that both rear wheels must turn together to get the correct number of times the driveshaft turns in relation to the wheel. Turns out mine makes a little more than 4 full revolutions to 1 full wheel revolution. I guess I can assume the gear ratio is 4:10? Thanks to everyone in the discussion, I have learned a ton. I almost forgot the point "toaster" made about the fuel efficiency of my burb. I was not able to determine the original rearend of the truck before the 1 ton rear end modification. I did not find the RPO code of my suburban on the 1973-1987 code list. Anyway, until I find this out, I won't know what adjustment to make for the rear end I now have.
Wayne
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Old 09-16-2004, 06:38 PM   #44
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A D70!?!?!?!?!! Wow thats a lot of axle for a Suburban!

There is a ton of sites that list RPO codes. Just put in RPO Chevy 1991 into Google and it should pull up several sites. Being a 91 I am pretty sure you started out with 3.42 or possibly a 3.73 but it would be very unlikely that you started with a 4.10 so you speedometer/odometer is reading wrong.
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Old 09-16-2004, 06:58 PM   #45
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More Confusion - andoboba & 59toaster

Quote:
Originally Posted by andoboba
.....You can identify this by looking for a casting number "60" on the lower portion of the housing just to the right of the pumpkin.....
I just crawled out from below the beast - the ONLY casting number I could find on the differential is on the LEFT side of the pumpkin and below the rear cover, on the back side, viewing from the rear forward. It clearly is "044" -- I don't think the "0" could be interpreted as a "D".

Any help in identifying what it is?

There are some numbers die stamped into the rear cover - 30809 333 5.
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Old 09-16-2004, 08:37 PM   #46
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Quote:
Originally Posted by 87MH
I just crawled out from below the beast - the ONLY casting number I could find on the differential is on the LEFT side of the pumpkin and below the rear cover, on the back side, viewing from the rear forward. It clearly is "044" -- I don't think the "0" could be interpreted as a "D".

Any help in identifying what it is?

There are some numbers die stamped into the rear cover - 30809 333 5.
It's a Dana 70 with the 10.54 ring gear. http://www.offroaders.com/info/tech-.../axlefacts.htm
Look on the casting on the left where the Roset weld it that retains the tube to the housing as well shape of the cover and any distigushing marks and compair it to the pictures in that link.

The numbers you show in the picture are going to refference stuff to Dana about the Casting it was produced from and proably bearing sizes for just the center section.

On one of the axle tubes will be stamped the SN#, PT# for the total assembly and date code. It's ususualy on the passengerside tube and visable from the back between the spring purch and the housing.
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Old 09-17-2004, 12:01 AM   #47
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Toaster
Given the fact that I have talked so much about this truck. I felt it would be fun to take some pics and post them. However. after several attempts. Im giving up until tomorrow.
Apparantly. the pics are too big to post. Maybe my 12 year old can figuire it out. He's way more tech literate than me. Should I be concerned about the rear axle we have been discussing, I mean is it appropriate for my burb?
Wayne
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Old 09-17-2004, 07:58 AM   #48
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Hehehe Yeah my Kid is starting to run me under the table on the computer too.

On the pictures you have to have them no larger then 640 wide by 480 high and under 250k of resolution. You an also hit the photo tab at the top and I think you can load a oversized photo to the photo album and then post the link.
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Old 09-17-2004, 03:24 PM   #49
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I spent some more time under my suburban looking for more confirmation of the axle and found the #s 70HD stamped on the left side of the differential where the axle housing connects. These numbers were on the left side as you are looking front to back. I gotta think they reference the Dana 70. Toaster, thanks for the help w/ the pics. Hopefully they will be forthcoming. Toaster, I have found the code for the original rearend. That gear ratio is 3:42. Now how do you determine the variance in gas mileage between the 4:10 gear?
Wayne
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