firewall for the 4x4 vers 2x2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Accelo** · 01-18-2024, 10:24 PM

suburban posted this:
"As a side note the firewall for the 4x4 is different from the non 4x4".

Can anyone explain the differences?

**jerry moss** · 01-18-2024, 10:33 PM

there is no difference in the firewall, just all 4x4 cabs are high floor hump but a 4x2 with a big block is a high hump also. i put a 71 2wd cab on my 69 4x4, just had to cut the floor for the high hump. factory bucket seat cabs from 69-72 have the mounting plates for the buckets welded underneath. 71 cabs have the raised boss in the roof for the rear view mirror. if i remember correctly 67 and maybe 68 cabs have some differences behind the gas tank.

**CAMAROBOY68SS** · 01-19-2024, 12:22 AM

Quote:

Originally Posted by jerry moss

there is no difference in the firewall, just all 4x4 cabs are high floor hump but a 4x2 with a big block is a high hump also. i put a 71 2wd cab on my 69 4x4, just had to cut the floor for the high hump. factory bucket seat cabs from 69-72 have the mounting plates for the buckets welded underneath. 71 cabs have the raised boss in the roof for the rear view mirror. if i remember correctly 67 and maybe 68 cabs have some differences behind the gas tank.

Also any 4 speed truck had the high hump. My 68 was a factory high hump but a 292 I6/4 speed

67 firewalls are unique as the recess for the motor in the middle is smaller overall due to no factory big block option. The modified the firewall in 68 to clear for a big block on the passenger side.

**special-K** · 01-19-2024, 09:40 AM

Correct. No difference. You've been misinformed. The K-model engines sit back tighter to the firewall is the difference in motor mount locations

01-18-2024, 10:24 PM	#1
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,194	firewall for the 4x4 vers 2x2 suburban posted this: "As a side note the firewall for the 4x4 is different from the non 4x4". Can anyone explain the differences?

01-18-2024, 10:33 PM	#2
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,794	Re: firewall for the 4x4 vers 2x2 there is no difference in the firewall, just all 4x4 cabs are high floor hump but a 4x2 with a big block is a high hump also. i put a 71 2wd cab on my 69 4x4, just had to cut the floor for the high hump. factory bucket seat cabs from 69-72 have the mounting plates for the buckets welded underneath. 71 cabs have the raised boss in the roof for the rear view mirror. if i remember correctly 67 and maybe 68 cabs have some differences behind the gas tank. __________________ 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

01-19-2024, 09:40 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: firewall for the 4x4 vers 2x2 Correct. No difference. You've been misinformed. The K-model engines sit back tighter to the firewall is the difference in motor mount locations __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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