Trans floor tunnel questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BlackhillsHD · 01-04-2012, 12:29 PM

I have a 70 4x4 with a two wheel drive cab. The PO just hacked the floor to make the t-case clear. I got a 4x4 trans tunnel for a blazer and it is way too short. Do I have the wrong tunnel or are Blazer and pickups different?

**too much stuff** · 01-04-2012, 03:08 PM

If it bolts in, it should be correct for a 4x4. The holes in it may be for different applications, but the height should be right. Burb, blazer, and trucks were the same i believe.

BlackhillsHD · 01-04-2012, 03:36 PM

Height is'nt really my issue. Its length. This started out as a 2wd cab. The PO cut along the inside of the ridge where a bolt in tunnel would go except on the back side they cut about 4" behind the seam. If I slide my tunnel all the way up to the firewall the T-case shifter is too far back in the hole and there would be no way I could pull it into 4 hi. This thing is a mutant and has had a lot of hands in it over the years it seems. I will try to get some pics up to better display it.

**too much stuff** · 01-04-2012, 04:01 PM

As i say, there are a few combonations of holes in the humps also for different applications. Post some pics when you can...

BlackhillsHD · 01-04-2012, 04:16 PM

here is four that I took, maybe can see what I am talking about.

01-04-2012, 12:29 PM	#1
BlackhillsHD Registered User Join Date: Nov 2011 Location: Rapid City SD Posts: 140	Trans floor tunnel questions I have a 70 4x4 with a two wheel drive cab. The PO just hacked the floor to make the t-case clear. I got a 4x4 trans tunnel for a blazer and it is way too short. Do I have the wrong tunnel or are Blazer and pickups different? __________________ 1970 : Chevy: K20 "Frank the Tank" 6.0 LS, 4L80E, 14 bolt, and Dana 44 1970 K5 Blazer CST 350, TH350, Np205, Dana 60 and 14 bolt General Motors Master Certified wrench swinger ASE certified Master auto tech Instructor of Automotive Technology

01-04-2012, 03:08 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,709	Re: Trans floor tunnel questions If it bolts in, it should be correct for a 4x4. The holes in it may be for different applications, but the height should be right. Burb, blazer, and trucks were the same i believe. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

01-04-2012, 03:36 PM	#3
BlackhillsHD Registered User Join Date: Nov 2011 Location: Rapid City SD Posts: 140	Re: Trans floor tunnel questions Height is'nt really my issue. Its length. This started out as a 2wd cab. The PO cut along the inside of the ridge where a bolt in tunnel would go except on the back side they cut about 4" behind the seam. If I slide my tunnel all the way up to the firewall the T-case shifter is too far back in the hole and there would be no way I could pull it into 4 hi. This thing is a mutant and has had a lot of hands in it over the years it seems. I will try to get some pics up to better display it. __________________ 1970 : Chevy: K20 "Frank the Tank" 6.0 LS, 4L80E, 14 bolt, and Dana 44 1970 K5 Blazer CST 350, TH350, Np205, Dana 60 and 14 bolt General Motors Master Certified wrench swinger ASE certified Master auto tech Instructor of Automotive Technology

01-04-2012, 04:01 PM	#4
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,709	Re: Trans floor tunnel questions As i say, there are a few combonations of holes in the humps also for different applications. Post some pics when you can... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

01-04-2012, 04:16 PM	#5
BlackhillsHD Registered User Join Date: Nov 2011 Location: Rapid City SD Posts: 140	Re: Trans floor tunnel questions here is four that I took, maybe can see what I am talking about. Attached Images __________________ 1970 : Chevy: K20 "Frank the Tank" 6.0 LS, 4L80E, 14 bolt, and Dana 44 1970 K5 Blazer CST 350, TH350, Np205, Dana 60 and 14 bolt General Motors Master Certified wrench swinger ASE certified Master auto tech Instructor of Automotive Technology



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