Old and New Cab Mounts Don't Match. Why - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Erl · 02-20-2011, 03:57 PM

The picture shows an original 1968 3/4 4x4 rear cab mount and a new Energy Suspension mount. It is clear that the new ES mount is longer/taller (maybe .375 inch), which raises the rear of the cab. Everything lined up on the cab to fenders before dis-assembly. Could the old mount have collapsed that much in 40 years or is the new mount wrong?. The front cab mounts are the same height for the old and new.

Erl

**LockDoc** · 02-20-2011, 07:44 PM

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The old ones do collapse some. Are those Poly cab mounts or rubber?

LockDoc

Shyguy · 02-20-2011, 07:56 PM

Are the new mounts for a 1/2 ton or 3/4 ton. The 3/4 ton ones are taller than the 1/2 ton.

**jerry moss** · 02-20-2011, 09:57 PM

your old rubber mounts collapse over time BUT the poly mounts don't collapse and thats a bad thing. i have poly mounts in one of my 4x4s and i'll never use them again, they don't crush at all so you have to shim the front cab and rad mounts otherwise everything is in a major bind. they also kill any flex between the body and frame--it's so bad in my 72 cheyenne super that my headliner trim creaks and pops in serious off camber situations.

Erl · 02-21-2011, 02:22 PM

If you Google Energy Suspension 3-4107 Polyurethane Mounts the following applications appear.

# Chevrolet 4WD K10 1967-1972

# Chevrolet 4WD K20 1967-1972

# Chevrolet 4WD K30 1967-1972

# Chevrolet C20 1967-1972

# Chevrolet C2500 1967-1972

# Chevrolet C30 1967-1972

# Chevrolet C3500 1967-1972

This mount covers a lot of trucks. I expect to have the exact problem Jerry Moss has described. If I knew the proper height, I believe that the poly mount could be shortened rather than shimming the other mounts.

Erl

02-20-2011, 03:57 PM	#1
Erl Registered User Join Date: Mar 2002 Location: Dallas, TX Posts: 555	Old and New Cab Mounts Don't Match. Why The picture shows an original 1968 3/4 4x4 rear cab mount and a new Energy Suspension mount. It is clear that the new ES mount is longer/taller (maybe .375 inch), which raises the rear of the cab. Everything lined up on the cab to fenders before dis-assembly. Could the old mount have collapsed that much in 40 years or is the new mount wrong?. The front cab mounts are the same height for the old and new. Erl Attached Images __________________ 1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX

02-20-2011, 07:44 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,656	Re: Old and New Cab Mounts Don't Match. Why - The old ones do collapse some. Are those Poly cab mounts or rubber? LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

02-20-2011, 07:56 PM	#3
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Old and New Cab Mounts Don't Match. Why Are the new mounts for a 1/2 ton or 3/4 ton. The 3/4 ton ones are taller than the 1/2 ton. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

02-20-2011, 09:57 PM	#4
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,916	Re: Old and New Cab Mounts Don't Match. Why your old rubber mounts collapse over time BUT the poly mounts don't collapse and thats a bad thing. i have poly mounts in one of my 4x4s and i'll never use them again, they don't crush at all so you have to shim the front cab and rad mounts otherwise everything is in a major bind. they also kill any flex between the body and frame--it's so bad in my 72 cheyenne super that my headliner trim creaks and pops in serious off camber situations. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

02-21-2011, 02:22 PM	#5
Erl Registered User Join Date: Mar 2002 Location: Dallas, TX Posts: 555	Re: Old and New Cab Mounts Don't Match. Why If you Google Energy Suspension 3-4107 Polyurethane Mounts the following applications appear. # Chevrolet 4WD K10 1967-1972 # Chevrolet 4WD K20 1967-1972 # Chevrolet 4WD K30 1967-1972 # Chevrolet C20 1967-1972 # Chevrolet C2500 1967-1972 # Chevrolet C30 1967-1972 # Chevrolet C3500 1967-1972 This mount covers a lot of trucks. I expect to have the exact problem Jerry Moss has described. If I knew the proper height, I believe that the poly mount could be shortened rather than shimming the other mounts. Erl __________________ 1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX

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