HO style rear end snubber

[wolfthing2000]

I am not sure what it is called for sure but I can understand what it does. I picked up a complete axle assembly today from a 72. The third member is the HO drop out style and there is a large bolt with a flat to turn with say a crescent wrench and a lock nut that is quite large on the drivers side front of 3rd member that screws through the side of the case and supports or puts pressure against the ring gear maintaining a good mesh at the pinion under heavy load. I have heard of it being discussed on this sight.
Who knows or how do we go about adjusting such device????
There is also a wear pattern on the back of pinion indicating where it's "puck" ( I have heard it called) was riding against the face opposite the ring gear teeth. A good idea it seems.
My Motors manual shows some axles for Chevrolet that have it , but they are shown only for the 1 1/2 and 2 ton trucks ( my book is a 66). ,, The 3/4 ton diagram does not show it. They call it the "Ring gear thrust pad".

The book says run it up to the ring gear while rotating and then back off 1/12 of a turn for adjustment.
Does this sound correct????
Why do I have this on a 72 3/4 ton axle??
Dave

[wolfthing2000]

ttt

[dwaite72lnghrn]

That is a H072 axle. They were in 1 ton trucks and it was to keep the carrier bearings from the extra stress of high torque starts.

[1969 GMC]

If it helps, the '66 H052 axle I have does not have the load bolt you are talking about. But, the '67 H072 centersection I should be getting from the Fedex man today has the bolt. It supposedly makes the centersection alot stronger.

[JIMs70GMC]

My 71 H052 does not have the bolt, but my 72 H072 does have it. Not sure how to adjust it. My 70 Chassis manual does not go into to much depth. Adam, did fedex find your center section? Let me know how it was shipped as I bought one from another member and want it to get here safely.

[1969 GMC]

Jim, it magically reappeared on the Fedex tracking system late last night, after more than a week of inactivity. It is scheduled to be delivered today, and knowing my luck thus far with it, those idiots smashed the crate it was in and ran it over with their truck
I will take pics when it gets here, Chris said he built a big bad mofo of a crate for it.

[Tx Firefighter]

I'd think that even if the Fedex guys smashed the crate and ran it over with their truck it would still be okay. Those things are dead serious heavy duty steel.

I'd be curious as to what it cost to ship one of those things.

[Chris H]

The Chris H. guide to shipping an HO72 center section:
-build "box" from 2x10's about 15" square
-set the 130 pound center section in the box ring gear down
-put in lots and lots of screws (use a mixture of square and philips drive, it keeps the recipient entertained for a while!)
-make a bottom with 3/4 plywood, lots of screws
-make sides from 1/2 and 3/4 plywood, with 2x2s in the corners
-screw some 2x6 across the top (use lots of screws, square and philips)
-top with a 1/2 plywood top, and some more screws!
-cut hand holes in the sides (we are up to around 150 pounds now!)
-wrap entire crate with cardboard (avoid special wooden crate handling charges)
-drop off at FedEx ground location. Bring a strong co-worker and make it a lunchtime field trip (dont tell co-worker you are going to help him herniate himself!)
-wait while crate from MN to OH takes a mysterious trip to Ft. Worth TX and "disappears" for a week???

1969 GMC will have to fill in the end of this story...

In retrospect, I would have gone with all 2x2s and 1/2 plywood to try to keep the weight down. FedEx Ground weight limit is 150 pounds, and I was at about 151 (she didn't see my finger helping my package make weight on her 150 pound limit scale!). It was $70 or so to FedEx, and whatever cost of crate materials. I used scrap, so just the cost of screws. Shipment must be made to a commercial/business address to qualify for ground.

In closing, I would like to thank Mr. Dewalt for inventing the cordless screw driver!! I hope you have one 1969 GMC, because you are going to need it!
Take a picture too!

[1969 GMC]

Originally Posted by Chris H

The Chris H. guide to shipping an HO72 center section:
-build "box" from 2x10's about 15" square
-set the 130 pound center section in the box ring gear down
-put in lots and lots of screws (use a mixture of square and philips drive, it keeps the recipient entertained for a while!)
-make a bottom with 3/4 plywood, lots of screws
-make sides from 1/2 and 3/4 plywood, with 2x2s in the corners
-screw some 2x6 across the top (use lots of screws, square and philips)
-top with a 1/2 plywood top, and some more screws!
-cut hand holes in the sides (we are up to around 150 pounds now!)
-wrap entire crate with cardboard (avoid special wooden crate handling charges)
-drop off at FedEx ground location. Bring a strong co-worker and make it a lunchtime field trip (dont tell co-worker you are going to help him herniate himself!)
-wait while crate from MN to OH takes a mysterious trip to Ft. Worth TX and "disappears" for a week???

1969 GMC will have to fill in the end of this story...

In retrospect, I would have gone with all 2x2s and 1/2 plywood to try to keep the weight down. FedEx Ground weight limit is 150 pounds, and I was at about 151 (she didn't see my finger helping my package make weight on her 150 pound limit scale!). It was $70 or so to FedEx, and whatever cost of crate materials. I used scrap, so just the cost of screws. Shipment must be made to a commercial/business address to qualify for ground.

In closing, I would like to thank Mr. Dewalt for inventing the cordless screw driver!! I hope you have one 1969 GMC, because you are going to need it!
Take a picture too!

Chris, thanks a ton for the centersection, I am more than happy with it! It finally did make it today, too...thanks Fedex . My dad lifted it up at work by himself into the bed of his F150, he claimed he popped a nut and limped around the rest of today, lol.
I couldn't believe how massive the crate was, and I was curious about the baby stroller box around the crate, but you already answered my question.

As far as the combo of philips and square head screws, you managed to find the one bit my dad or I dont have. Dad had one square bit, but it was too small . Using a large philips bit and a lot of pressure got a few of them out, but it usually bottomed the bit out in the chuck of the drill, and generally pissed me off, so I had to make a trip to the local Wally World, got a baggie of square bits for $1 and was good to go.
Of course, then the only good battery we have at home died. So we took an hour dinner break, and I just now got it taken apart. My dad was very impressed with the crate, as was I. It was a monster! Thanks again Chris, I will gladly do business again with you in the future!
pics:

[wolfthing2000]

Hey 69 GMC! That 3rd member looks identical to what I have setting on the floor of the garage right now. Is that a 5 gallon bucket the thing is setting on? If so I believe you have just given me a brain storm for flushing out the old oil and what not from one of these, Fill with diesel ( I use it exclusively for cleaning fluid and penetrating fluid ( mix it with ATF) ) and then set the 3rd member over the close to full bucket and using a 1/2 inch impact wrench turn the whole thing over like crazy.the dirty solution settling to the bottom and the clean flui constantly cleaning and flushing gears bearings and all!!!

Sounds like a back yard miracle about to happen here!!

Dave

[1969 GMC]

yup its a 5 gallon bucket, its shaped perfectly for one of these center sections...sorry to have hijacked your post too, btw.

[wolfthing2000]

just goes to show how big and heavy duty these components are!!!

[crew70]

Hay chris did that carrier come out truck I might be familer with?

[crew70]

OK my 70 crewcab (ho52) has this bolt. I beleave ,from what I have learned about these carriers is that the carriers were the same from ho52 and ho72 .

any one?

[Chris H]

Hey Mike (Crew70)! Long time!
No, the center section that 1969 GMC got is a 5.14 out of my 1968 C30 Chevrolet Open Road motorhome. Very very similar to the one I got from you, but this one had 28k original miles, and the camper was ready to use! I did pay a bit more that the 67 GMC I got from you, but drove it 400 miles home from Escanaba, MI with no trouble. The 67 GMC has a 4.57 HO72 (with load bolt), and would work great with an overdrive. (anyone have a used gear vendors overdrive for a TH400?).

1969 GMC, glad you finally got your treasure! Hope your dad's "parts" recover soon as well! I know mine were dragging the ground after moving that thing around! You might want to hang on to that crate, the way plywood is going up, you might be sitting on a small fortune! It makes a handy garage stool as well!

I have a 4.10 HO52 with a locker that came out of a 72 K20. It does have the load bolt.
The 5.14 and the 4.57 HO72 sections that I have had also had load bolts.
I dont understand the rhyme or reason to what got load bolts? I would assume all C30s?
Maybe all HO rear ends with factory lockers as well? Anyone have a locked rear without a load bolt?

[1969 GMC]

Chris, I have a 4.57 H052 with the locker and NO load bolt. Thats why I was picky about this one having it :p
It is from a '66 C20, coil sprung.
Your centersection + the locker + the rest of the other axle = whats goin in my truck.
thanks again!