C20 Cab Mounts

[dagnabbitt]

Still putting together my 1968 C20, I am completely in love with this truck and so I have started to notice little things, like the body lines between the cab and the bed do not line up. Got it on the hoist and sure enough, the mounts are absolutely destroyed/rotted away.

I'd like to replace them, but have never done something like this before. I know that people have lots of opinions about replacing rubber bushings with urethane, going stock or going better than stock, etc etc.

Is there a supplier other than LMC that you guys would recommend (theirs are on "backorder")?

It'd be pretty convenient to find something like this on Amazon, but I know the C20 mounts are specific and its not likely I will.

[Willys_MB]

I'm also interested in this. I'm no expert, but I usually like OEM parts. A lot of folks on here have differing opinions about it, but I'd be interested in some polyurethane mounts, too. There are kits for C10's out there, not sure about C20's. Maybe I just need another truck to compare rubber vs poly

[rpmerf]

Here is a reference of my expereince with changing the body mounts on my C20. The bed and cab do not line up on the passenger's side. Haven't really looked into why.

http://67-72chevytrucks.com/vboard/s...d.php?t=770357

Realigning doors after installing body mounts:
http://67-72chevytrucks.com/vboard/s...d.php?t=772583

[LockDoc]

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The bad thing about the poly is that they are hard and transfer all shock loads to the entire cab. GM used rubber because they absorb the shock loads and make for a softer ride in the cab. Granted the "new" rubber stuff doesn't last like it should, but I would still choose it over the poly.

Just my 2¢ worth.....

LockDoc

[dagnabbitt]

Thanks for the input, I would likely go rubber, a C20 needs all the ride it can get.

Anyone recommend a supplier? As I said LMC has it backordered.

[NorCalC20LWB]

Got mine at GMC Pauls, great quality, made a world of difference in the ride.

[dagnabbitt]

I never got around to replacing these, this past summer, but I am still hoping to find cab mounts for my C20 because I am definitely doing it this winter.

GMC Paul - as far as I can tell from searching the site - only offers mounts for half tons.

Unless someone can recommend a supplier for rubber C20 Cab Mounts I will be forced to order the polyurethane ones from LMC, just asking one more time to see if someone knows of a good supplier. Love this site, any help would be appreciated.

LMC's:

https://www.lmctruck.com/1967-72-che...nt-bushing-set

[roboticjunky]

Here's GMC Paul's
C20 / C30 / K10 / K20 / K30 Cab, Radiator Support, Bed Mounting Kit Kit
#277768 $145

It's the 17th item down the list.
https://gmcpauls.com/rubber_&_weather_strip_21.htm

[gmc684x4]

I seen rubber mounts at Gmc pauls site
I have went prothane on two of my trucks there both 4x4s

I will most likely go with that route again with my 2x4 truck
Rock auto and summit are places i have ordered them from in the past

Seeing your in edmontruck have you checked out Scotts supertrucks in penhold ab i have gotten lots of parts from him as well as the first poly mount set i bought

[SkidmoreGarage]

I'd recommend rubber mounts from classic heartbeat. They are a complete kit, and bolt right up. They also appear to be quality rubber.

For others who might be on the fence regarding rubber or poly, I'm not sure poly would be a benefit in this case. The cab is not part of the suspension system. It's like making the bench seat springs stiffer to improve handling. Better to put the effort into somewhere else to improve the ride/vehicle dynamics.

[zschary]

I just replaced mine in my 67 c20 days ago.. Not too hard, the rear ones were a bit tougher but OK.. GMCPAULS is where i went.. They arrived fast.. they look good and the truck looks aligned and the doors shut well

[72c20customcamper]

I went with ones from Classic parts . Thought the cab was too high after I installed them but it was just I was used to the worn out ones . Looking at others the bed lines up well. Not sure of the ride yet as I'm still working on the truck. I went with rubber c20s need all the cushioning of the cab they can get.

Was very easy to replace just put a piece of 4x4 on a Jack and lifted one side at a time. Your mileage may vary as this truck has very little rust on it. I reused the original hardware as the new bolts were different.

[dagnabbitt]

Originally Posted by gmc684x4

I seen rubber mounts at Gmc pauls site
I have went prothane on two of my trucks there both 4x4s

I will most likely go with that route again with my 2x4 truck
Rock auto and summit are places i have ordered them from in the past

Seeing your in edmontruck have you checked out Scotts supertrucks in penhold ab i have gotten lots of parts from him as well as the first poly mount set i bought

I head down there whenever I can with my shopping list!

[dagnabbitt]

Originally Posted by SkidmoreGarage

The cab is not part of the suspension system. It's like making the bench seat springs stiffer to improve handling. Better to put the effort into somewhere else to improve the ride/vehicle dynamics.

Interesting point.

I have not had a chance to compare the two, but: what reason would there be for the C20 mounts to be different from those on a C10, if all they do is keep the body off the frame?

Is it just because the box needs stronger/thicker ones for hauling... meaning that you need the same for the cab and rad in order for body lines to match?

[gmc684x4]

My view about poly mounts are not for suspension capability its last longer then most new rubber mounts
I have a set in my 68 more then 25 years

The rear cab frame mount is at a different height on a c10 then c20 or k series

[GMCPaul]

Originally Posted by dagnabbitt

Interesting point.

I have not had a chance to compare the two, but: what reason would there be for the C20 mounts to be different from those on a C10, if all they do is keep the body off the frame?

Is it just because the box needs stronger/thicker ones for hauling... meaning that you need the same for the cab and rad in order for body lines to match?

The 3/4 ton and 4X4 body mounting cushions are taller because they place the rear frame to cab mounting brackets lower on frame on those trucks than they do on 1/2 ton 2 wheel drive trucks. The reason for this is the 3/4 ton and 4X4 trucks suspensions are stiffer and expected to be on rougher terrain than 1/2 ton 2 wheel drive trucks and the additional rubber height of rear cushions it helps to cushion / absorb the rougher ride better than a shorter rubber mounting cushion would. If you raised the rear frame bracket mounts the body cushions sit on for 3/4 ton and 4X4 trucks to the same height they are mounted on the frame as the 1/2ton 2 wheel drive then you could use the shorter read cushions but you would compromise ride quality.
Paul Jr @ GMCPauls