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3/4 ton truck

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3020Deere

01-15-2003 17:50:27




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Didnt know where to post this...guess this as good as any...

I bought a '72 3/4 Ton Chevy Pickem-up. Always had 1/2 tonrs before.. ANy way went to check the brakes on the rear and noticed that I was entering in a whole different world...How to I get the drum off to see inside..Do you have to remove the axle?? help!?!?!?

THanks




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don t. - 9n180179

01-17-2003 06:00:18




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
I've got a 72 GMC 3/4. It looks like a POS but starts/runs great. As mentioned in another post, this most excellent site also has a classic truck section. I also used www.67-72chevytrucks.com
This site has a bucha guys that do nothing but our trucks. Its a bit on the young(er) side but tons of good info, for the most part a good group.
Good luck...don t. ...



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Skinner

01-17-2003 04:05:41




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
The reason your getting two different conflicting answers is because Chevy made a 3/4 with / and without a floating rear axle, however in 72 I "thought" they were all floating. If you have a hub sticking out the center of your wheel with 8 bolts, then it's a floating axle which will have to be removed just like the posts state below. If there is not a hub with 8 bolts, but you only have lug bolts, then it is not a floating axle and the drum can be removed without removing the axle. If I "remember" correctly, all 6 lug wheels did not have floaters, and all 8 lug wheels did. Chevy made a lot of 6 lug 3/4 tons that did not have floaters, but I "thought" that was later on....

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Fred Kobs

01-16-2003 04:20:58




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
Hey 3020...when you put this back together either pack the wheel bearings with grease or you can cheat and jack each side high to get the 80-90 to run into the hubs, just remember that the oil has to run thru the inner bearing to reach the outer one. Have seen guys smoke the brgs. from no lube after service. Fred.



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Truck Forum John

01-15-2003 22:16:17




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
If you will look down the page, there is now a truck forum, guys there would be glad to help out too.



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Gary in TX

01-15-2003 20:38:40




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
Hi,
Just wanted to cover how I do mine on my 78 GMC 3/4 ton to add with the other posts. First off Jack up and put the rear axle on stands, Second take the rear wheels off, Third take the 8 bolts on the end of the axle out, Fourth pull the axle out, Fifth you will have one or two tangs to bend out of a locking nut on the end of the axle tube, Sixth unscrew the nut off of the axle tube and then you should be able to pull the drum off.
You of course may have to adjust your old shoes down so the drum will come off and of course be carefull of the seals and bearings.
Note: If your going to all the trouble to go into all of this you will want to replace the bearings and seals anyhow. Thats the procedure I follow anyhow, hope this helps.

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kjm

01-15-2003 19:50:59




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
3020, If you only want to check the shoes there are two tin plugs on the outside of the backing plate. Take them out and look in to see the shoes, remember to alow for the rivited shoes. If it is wet in the hub look for wheel cyl. and axle seals.



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Dennis Benson

01-15-2003 19:06:11




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
If you have a large hub coming through the wheel bolted to the hub, and it should have 8 bolts on the wheel, you will have to remove the wheel, Remove the bolts from the center holding the axle flange to the hub. You will have to take a screw driver and hammer and pry aside the locking tabs outward toward the hub, and unscrew the nut that is around the axle housing tube, remove the ring with the locking tabs, and remove another nut around the axle housing. Then if the brake shoes are backed off you should be able to slide the hub and brake drum off the axle housing, and be sure to catch the outer bearing so it doesn't fall in the dirt, and be careful of the seal on the inside of the hub. You may want to buy the axle nut wrench to unscrew the nuts that hold the hub on, I bought one from Advance Autoparts, but any part store should have one. I'm quite familiar with this one right now because I just had 3 complete rear ends on my bench, the one ton single wheel from under my truck, a one ton duals I had setting around, and a 3/4 ton. I had part of the spider come out through my housing, and I was comparing the 3 and saw how similar they were, the brakes being the greatest difference, amd spacing of brackets next, I had to grind some off and reweld them in different positions, and swap brakes. But you should get a book for the truck. Ebay has factory shop manuals, I got all of them for my 1975 GMC.

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3020Deere

01-15-2003 19:29:32




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 Re: Re: 3/4 ton truck in reply to Dennis Benson, 01-15-2003 19:06:11  
Hey thanks Big help...I have a chilton but doesnt cover the 3/4 ton brake assembly. only 1/2 ton..By taking this apart do you loose rearend oil??



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Dennis Benson

01-15-2003 21:22:25




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 Re: Re: Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 19:29:32  
Yes, you can loose some rear end oil, especially if it tips down on one side. To take the drum off you will have to knock the lug bolts out, if you do it carefully, with a piece of brass or aluminum you should be able to get them out without damaging the threads. Getting replacement lug bolts and nuts are not difficult, they usually stock them at parts stores like Advance Autoparts. If you take the drums and hubs in to have them turned you will need to take them to a truck place with a heavy enough lathe. The average brake drum lathe will tip with one on it, according to the shop I used to work for. When you get the factory service manual on Ebay, look for the wiring manual, and a unit repair manual, too. Things for that age Chevy and GMC are popular on Ebay, I even bought my truck there, and had a nice trip to get it.

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Ed

01-15-2003 18:41:31




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
Yes you'll have to pull axle and remove the drum on your truck,IF THE REAREND IS 1972,and it is a full 3/4 ton.



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GMC 3/4

01-15-2003 18:01:36




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 Re: 3/4 ton truck in reply to 3020Deere, 01-15-2003 17:50:27  
I have 1976 3/4 ton and you do not have to remove the axle. You may have some rust issues but it is really simple set up. Go to discount auto parts store and get the "idiots" book for your truck.



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