Punched Holes in Tranny Hump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andice · 11-23-2010, 12:15 AM

My '64 Fenderside has two punched holes in the upper portion of the transmission hump similar to the holes depicted in the attached photo. It seems like i have seen these holes punched in other trucks on this forum. Why would these holes be there? Will I regret patching them?

jonzcustomshop · 11-23-2010, 01:45 AM

A guess , but they might be to geat at those 2 upper bolts easier bellhousing/motor.
those 2 are the hardest to get a good bite on.

padresag · 11-23-2010, 03:40 AM

theoretically one doesn't need to undo those bolts on a std trans in the truck as everything in the flywheel clutch area is accessible through the bottom of the b/housing and if it is an a/t a 24" ext and a 9/16 impact flex socket will get up in there nicely
ron

raycow · 11-23-2010, 07:16 PM

If you have a stock bellhousing (cast iron and open on the bottom) there is no real need for those holes. If you have an aluminum full-circle bellhousing, you might want to leave them there.

Ray

**rideblue00** · 11-23-2010, 07:35 PM

Im thinking it looks like a car 4 speed setup. Maybe it had 2 different car 4 speed setups over time.

**DPowers** · 11-23-2010, 09:30 PM

Bullet holes?

mikie 1954 · 12-09-2010, 04:49 PM

My 64 gmc has the same holes, they are drane holes for aftermarket ac underdash unit. There are 2 drane tubes one on each side of unit. MIKE

SCOTI · 12-09-2010, 05:46 PM

Quote:

Originally Posted by mikie 1954

My 64 gmc has the same holes, they are drane holes for aftermarket ac underdash unit. There are 2 drane tubes one on each side of unit. MIKE

x2. My 64 (the one I had back in high school) had a dealer installed under-dash a/c set-up. It had 2 drain tubes that were poked through the floor carpet & dumped condensate out the tunnel.

61_FL_Apache · 12-09-2010, 07:04 PM

Quote:

Originally Posted by DPowers

Bullet holes?

Maybe so

gulffishin · 12-09-2010, 07:13 PM

I would plug them with rubber grommets. Then you can keep the cold air out and be able to access the bolts if needed.

markeb01 · 12-09-2010, 07:20 PM

Quote:

Originally Posted by SCOTI

x2. My 64 (the one I had back in high school) had a dealer installed under-dash a/c set-up. It had 2 drain tubes that were poked through the floor carpet & dumped condensate out the tunnel.

That makes a lot of sense. That's how they installed aftermarket smog controls on old engines back in the early 60's. A hole would be drilled in the intake manifold (while it was bolted on the engine!), and then a lead hose fitting was pushed into the hole. The valve cover and air cleaner didn't need a drill because a fine precision hole (?) could be pounded in with a punch and hammer looking just like the ones in the floor pan photo. Hoses were attached and the car was now smog legal. Of course the engine failed shortly thereafter because of all the filings dropped in the engine and all the new found vacuum leaks.

mikie 1954 · 12-10-2010, 08:53 PM

I still have the ac unit in storeage. I could get the make and model # if you want to check it further.

11-23-2010, 12:15 AM	#1
Andice Registered User Join Date: Oct 2009 Location: Austin, Texas Posts: 241	Punched Holes in Tranny Hump My '64 Fenderside has two punched holes in the upper portion of the transmission hump similar to the holes depicted in the attached photo. It seems like i have seen these holes punched in other trucks on this forum. Why would these holes be there? Will I regret patching them? Attached Images

11-23-2010, 01:45 AM	#2
jonzcustomshop 1961 crewcab Join Date: Dec 2007 Location: missoula, mt Posts: 6,164	Re: Punched Holes in Tranny Hump A guess , but they might be to geat at those 2 upper bolts easier bellhousing/motor. those 2 are the hardest to get a good bite on. __________________ 60 build: http://67-72chevytrucks.com/vboard/s...d.php?t=280904 61 crew build: http://67-72chevytrucks.com/vboard/s...d.php?t=646830 63 build: http://67-72chevytrucks.com/vboard/s...d.php?t=336537 64 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=448681 65 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=590715 65 build: http://67-72chevytrucks.com/vboard/s...d.php?t=281955

11-23-2010, 03:40 AM	#3
padresag Registered User Join Date: Feb 2008 Location: Sidney,b.c. Posts: 4,425	Re: Punched Holes in Tranny Hump theoretically one doesn't need to undo those bolts on a std trans in the truck as everything in the flywheel clutch area is accessible through the bottom of the b/housing and if it is an a/t a 24" ext and a 9/16 impact flex socket will get up in there nicely ron

11-23-2010, 07:16 PM	#4
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Punched Holes in Tranny Hump If you have a stock bellhousing (cast iron and open on the bottom) there is no real need for those holes. If you have an aluminum full-circle bellhousing, you might want to leave them there. Ray __________________ Live more responsibly. Eat lower on the food chain. Eat vegetarians.

11-23-2010, 07:35 PM	#5
rideblue00 Senior Member Join Date: Feb 2010 Location: Lambertville, MI Posts: 1,856	Re: Punched Holes in Tranny Hump Im thinking it looks like a car 4 speed setup. Maybe it had 2 different car 4 speed setups over time.

11-23-2010, 09:30 PM	#6
DPowers One foot in front of the other Join Date: Aug 2008 Location: Parrottsville, TN Posts: 5,433	Re: Punched Holes in Tranny Hump Bullet holes? __________________ DP's 66 Build http://67-72chevytrucks.com/vboard/s...d.php?t=361556

12-09-2010, 04:49 PM	#7
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Punched Holes in Tranny Hump My 64 gmc has the same holes, they are drane holes for aftermarket ac underdash unit. There are 2 drane tubes one on each side of unit. MIKE

12-09-2010, 07:13 PM	#10
gulffishin Registered User Join Date: Jul 2010 Location: AL Posts: 180	Re: Punched Holes in Tranny Hump I would plug them with rubber grommets. Then you can keep the cold air out and be able to access the bolts if needed.

12-10-2010, 08:53 PM	#12
mikie 1954 Registered User Join Date: May 2009 Location: caliente ca. Posts: 297	Re: Punched Holes in Tranny Hump I still have the ac unit in storeage. I could get the make and model # if you want to check it further.



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