Cab mount poping
Posting Guru
Joined: Sep 2003
Posts: 1,002
Likes: 1
From: Right Next to U
If fuel tank leaks from the top, its the gasket, if the fuel gage doesn't work, it may be the gage or the sender ...or a loose wire connection....depending on if its a metal leak from rust it is the best way to replace a tank and sending unit..and you'll have to dropp the tank to inspect it or pull the rear bed off to do it.
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Joined: Jan 2001
Posts: 56,995
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From: Virginia
Mine wasn't making a popping noise, but the cab and the driver's door was always rattling over bumps.
My frame and crossmembers were really getting rusty, so I scraped and painted the frame, and got the back half of the frame off a later model 2wd truck, and drilled out all the crossmembers from it, and bolted them in my frame. What I found out was the 2wd crossmember underneath the cab, as well as the same crossmember on mine, were both rusted out right under the rubber bushing. To look at it, you can't even tell it's rusted, since it rusts out perfectly under the rubber mount. You end up with a nice round about 3 inch hole in the crossmember when the two rear cab mount bolts are taken out, and the rear of the cab is jacked up.
I took two small square plates and used them to bridge over the hole on the driver's side, and then remounted the cab. Boy what a difference! It rides like it's brand new.
Here's a picture of the crossmember. That big round hole in the top is not supposed to be there. It's only supposed to be about 1/2" or a little larger in diameter for the mount bolt to go through.
My frame and crossmembers were really getting rusty, so I scraped and painted the frame, and got the back half of the frame off a later model 2wd truck, and drilled out all the crossmembers from it, and bolted them in my frame. What I found out was the 2wd crossmember underneath the cab, as well as the same crossmember on mine, were both rusted out right under the rubber bushing. To look at it, you can't even tell it's rusted, since it rusts out perfectly under the rubber mount. You end up with a nice round about 3 inch hole in the crossmember when the two rear cab mount bolts are taken out, and the rear of the cab is jacked up.
I took two small square plates and used them to bridge over the hole on the driver's side, and then remounted the cab. Boy what a difference! It rides like it's brand new.
Here's a picture of the crossmember. That big round hole in the top is not supposed to be there. It's only supposed to be about 1/2" or a little larger in diameter for the mount bolt to go through.
Elder User
Joined: Nov 2005
Posts: 733
Likes: 2
i'd support franklin's prognosis on this issue, i've seen that happen before. if your cab mount really did pop off, however, theres a good chance you wouldn't be able to get enough good metal to get a weld worth your time. generally, with rusted off parts, its better to replace, fabricate, or simply leave it alone, and in that case, its normally easier to rivet the part on, since a weld on bad metal won't hold anyways. just my .02 worth
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Senior User
Joined: Aug 2005
Posts: 286
Likes: 0
well, i looked at the back cab mount a little and it moved up and down. When I go pick the truck up this evening, I will have a better look.
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More Turbo
Joined: Mar 2002
Posts: 508
Likes: 2
From: Easthampton, Ma.
These trucks are known for rusted cab mounts. The metal dissapears between the rubber cab mount biscuits.
Put a 2x6 running parallel under the rocker panel and jack up the cab with a floor jack.
Grasp chest over heart when cab seperates from frame (don't worry, when jack is let down it falls right back into place)
This can be fixed with a new mount (because you had to cut old one out with a sawzall) and a couple of large washers big enough to sandwich the oversized hole in the frame.
Usually the first ones to go are the radiator support mounts.
Good luck!
Steve G.
Put a 2x6 running parallel under the rocker panel and jack up the cab with a floor jack.
Grasp chest over heart when cab seperates from frame (don't worry, when jack is let down it falls right back into place)
This can be fixed with a new mount (because you had to cut old one out with a sawzall) and a couple of large washers big enough to sandwich the oversized hole in the frame.
Usually the first ones to go are the radiator support mounts.
Good luck!
Steve G.
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