Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ont67shortbox · 01-24-2015, 11:31 AM

I jacked up the 67 and noticed a line worn on the drive shaft from the driveshaft loop.The bolt heads were also worn a bit from rubbing.The driveshaft is right in the center of the loop and not sure what is causing this,could it be a motor mount? I have stock ones,maybe I should go with the solid steel ones,I am at a loss any help would be great. Truck has a 427 w/auto, 3500 stall 486 gear and runs low 12s at 110 with a 1.7 60ft.

KQQL IT · 01-24-2015, 12:15 PM

Any pictures?

71Dragtruck · 01-24-2015, 12:48 PM

Even if not the problem, you may want to get a set of poly motor mounts and a poly trans mount anyway, easier on stuff than solid and 10x stronger than stock. I have a set kicking around somewhere I'm not using now that I went to a engine plate.

Can you see on the loop if it's rubbing the sides or top/bottom?

Marv D · 01-24-2015, 02:17 PM

Ditto
Look at the loop and see where it's rubbing. That much side to side movement sounds more like a failed trans mount (missing bolts) rather than motor mounts.

Ont67shortbox · 01-25-2015, 06:44 PM

I will check for the rub,I do have a poly trans mount and the bolts are grade 8 and tight
will look this week and let you know what I find

Super73 · 01-25-2015, 07:07 PM

Centered side to side? What about top to bottom?

Could it be rubbing under hard launch from squatting?

Ont67shortbox · 02-07-2015, 12:13 PM

its centered both side to side and top to bottom,not a lot of clearance from bolt heads to driveshaft,(rubbing on the bolt heads from the drive shaft loop has even rubbed on the balance washer they welded on at the driveline shop)) may go with a dom shaft with a 3 in dia instead of the steel one (3 1/2) I have now , may solve part of the problem.71 I am interested in your poly mounts, message me with more details please

GASoline71 · 02-15-2015, 01:25 AM

Quote:

Originally Posted by KQQL IT

Any pictures?

This...

Gary

Kyle@FTP · 02-16-2015, 02:34 PM

1 piece or 2 piece shaft? Is the truck lowered? Pictures would be a huge help.

When I lowered my 67 I had to notch the top of the loop to clear the driveshaft. It only rubbed in the last inch or 2 of travel.

Ont67shortbox · 02-16-2015, 04:41 PM

its a one piece its lowered 2 1/2 inches in front/4 inches in back, its rubbing on the bolt heads of the brackets. The shaft is a 3 1/2 inch am going to go to a 3 inch DOM so that should add some clearance. Thinking the engine mount may be shot from the torque on a stock 40 yr old motor mount. will probably go with the Energy Suspension ones.the transmission/driveshaft is out of the truck right now.

Ont67shortbox · 04-28-2015, 05:45 PM

Thanks for all the help, found the problem.I took the engine out last weekend and was looking at the stock mounts,and where the rubber insert goes between the clam shells one was higher than the other. I took a hammer and tapped on it and it would move up and down.Ordered new Moroso engine mounts today and a new poly trans mount (just in case the other was bad,looked ok, but not taking any chances)

01-24-2015, 11:31 AM	#1
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Help I jacked up the 67 and noticed a line worn on the drive shaft from the driveshaft loop.The bolt heads were also worn a bit from rubbing.The driveshaft is right in the center of the loop and not sure what is causing this,could it be a motor mount? I have stock ones,maybe I should go with the solid steel ones,I am at a loss any help would be great. Truck has a 427 w/auto, 3500 stall 486 gear and runs low 12s at 110 with a 1.7 60ft.

01-24-2015, 12:15 PM	#2
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,154	Re: Help Any pictures? __________________ " That didnt make it any newer " " Dont antique the equipment "

01-24-2015, 12:48 PM	#3
71Dragtruck Registered User Join Date: Jun 2004 Location: Saskatchewan, Canada Posts: 1,368	Re: Help Even if not the problem, you may want to get a set of poly motor mounts and a poly trans mount anyway, easier on stuff than solid and 10x stronger than stock. I have a set kicking around somewhere I'm not using now that I went to a engine plate. Can you see on the loop if it's rubbing the sides or top/bottom? __________________ Speed is just a matter of money, question is how fast can you afford to go? 8.95@148.97mph all motor haven't tried bottle yet Sponsored by: Getz Oilfield Consulting Hard Candy Customs

01-24-2015, 02:17 PM	#4
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: Help Ditto Look at the loop and see where it's rubbing. That much side to side movement sounds more like a failed trans mount (missing bolts) rather than motor mounts. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

01-25-2015, 06:44 PM	#5
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Re: Help I will check for the rub,I do have a poly trans mount and the bolts are grade 8 and tight will look this week and let you know what I find

01-25-2015, 07:07 PM	#6
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: Help Centered side to side? What about top to bottom? Could it be rubbing under hard launch from squatting? __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

02-07-2015, 12:13 PM	#7
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Re: Help its centered both side to side and top to bottom,not a lot of clearance from bolt heads to driveshaft,(rubbing on the bolt heads from the drive shaft loop has even rubbed on the balance washer they welded on at the driveline shop)) may go with a dom shaft with a 3 in dia instead of the steel one (3 1/2) I have now , may solve part of the problem.71 I am interested in your poly mounts, message me with more details please

02-16-2015, 02:34 PM	#9
Kyle@FTP Registered User Join Date: Dec 2013 Location: Escondido Posts: 700	Re: Help 1 piece or 2 piece shaft? Is the truck lowered? Pictures would be a huge help. When I lowered my 67 I had to notch the top of the loop to clear the driveshaft. It only rubbed in the last inch or 2 of travel.

02-16-2015, 04:41 PM	#10
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Re: Help its a one piece its lowered 2 1/2 inches in front/4 inches in back, its rubbing on the bolt heads of the brackets. The shaft is a 3 1/2 inch am going to go to a 3 inch DOM so that should add some clearance. Thinking the engine mount may be shot from the torque on a stock 40 yr old motor mount. will probably go with the Energy Suspension ones.the transmission/driveshaft is out of the truck right now.

04-28-2015, 05:45 PM	#11
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Re: Help Thanks for all the help, found the problem.I took the engine out last weekend and was looking at the stock mounts,and where the rubber insert goes between the clam shells one was higher than the other. I took a hammer and tapped on it and it would move up and down.Ordered new Moroso engine mounts today and a new poly trans mount (just in case the other was bad,looked ok, but not taking any chances)



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