Cab Mount bushings questions

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Safetyguy

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Central Coast, CA
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Greg
Truck Year
1977
Truck Model
K20 Scottsdale Camper Special
Engine Size
400
Original owner of my '77 Chevy K20. Just removed the rear cab mount bolts to do a replacement, as the bushings are shot after 49 years! Wasn't planning on doing the fronts. Can just the rear ones be done without loosening the front bolts? Also which brand kit would work best and easiest to replace. Not keen on cutting sleeve down as Energy Suspension says in their instructions. Does any kit use just the OEM sleeves?
Just an FYI as I saw several pics of folks cutting the floor to get at the captive nut. My passenger side bolt came out without too much effort. Driver side was another story. What I did was use a long drill 1/4" bit to drill up through floor at the passenger side, then measured the distance: 36" between and 2-1/2" off back wall. Drilled another hole down and squired a bunch of PB Blaster down inside. Let it soak awhile and then removed that bolt. If it did not work, I planned to drill a 1-1/2" hole with a hole saw and nut it up with a longer bolt and put a 1-1/2" snap cap in it without doing the cut and weld thing. Fortunately the PB Blaster worked! Thanks all.
 

Safetyguy

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Greg
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1977
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K20 Scottsdale Camper Special
Engine Size
400
Has anyone just done the rear bushings as my fronts look good. How loose do the front bolts/bushings have to be to get the rear jacked up enough to get them out and new rear ones in? Thanks!
 

DoubleDingo

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Carb'ed Vortec 350
If you only replace the rears, then the cab will sit high in the back, just replace all of them and be done with it. It's a little more time and effort to do them all at once
 

Broken85

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I’ve done them one at a time before. It’s not a big deal. Granted, these are farm trucks that you wouldnt notice the difference on, but I didn’t notice the difference.

The captured nuts always slip and there is no way I was volunteering to cut the floors and replace bushing that weren’t bad!
 

PrairieDrifter

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350, 350, 350, 350, 350, 350
It's not all about the bushings always. There have been plenty of cases where the bolts are damn near rusted away while the bushings still looked "okay".

My suburban is pretty rust free in the front but those two front bolts were very thin from what they used to be.
 

Safetyguy

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1977
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K20 Scottsdale Camper Special
Engine Size
400
Going to replace the fronts as well. Got the bolts broken loose without issue. Took the bed off with my tractor bucket, and I'm just waiting delivery of bushings I ordered through Jegs. Shipment delayed 3 weeks! WTH?
Replacing both tanks and sending units as well.
Thanks
 

PrairieDrifter

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North Dakota
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Mason
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84,79,77,76,70,48
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Suburban k10, bonanza k10, k30, k20, c10, gmc 1/2ton
Engine Size
350, 350, 350, 350, 350, 350
Going to replace the fronts as well. Got the bolts broken loose without issue. Took the bed off with my tractor bucket, and I'm just waiting delivery of bushings I ordered through Jegs. Shipment delayed 3 weeks! WTH?
Replacing both tanks and sending units as well.
Thanks
Always have used summit. Their shipping is crazy fast and free for over $100 orders
 

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