Help with clamshell mount stands in a 71 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Farmtruck · 11-05-2007, 02:04 PM

I am trying to install the later model motor mount stands in my 71 pickup, the top two bolts line up on the top of the c frame, but the two on the X-member do not. Can I drill the holes and mount it like that and maintain the correct geometry?

**john** · 11-05-2007, 06:02 PM

To the board.

This thread should help.

http://67-72chevytrucks.com/vboard/s...d.php?t=128765

71Farmtruck · 11-07-2007, 01:56 PM

Thanks for the welcome and your help, much appreciated. I look forward to discussing and sharing tech ideas and issues.

71Farmtruck · 11-08-2007, 10:02 AM

So why do the newer style engine mount stands need to have its bolt holes elongated for the mount? It wont bolt up correctly without some adjustment or what???

71Farmtruck · 02-14-2008, 04:08 AM

Ok, after a short hiatus I have picked up my project. I followed the thread's instructions and got the engine stabbed, I am now having a problem with the tranny contacting the floor pan when the X-member and trans mount is installed, I have contact where floor pan meets the firewall, and the tailshaft contacts the floor pan. Should I loosen the mounts, lift the engine and see if the engine will sit down some, or modify my X-member to bring the mounting point down some? I need about 1/2 to 3/4 of an inch to
clear the floor pan.

gringoloco · 02-14-2008, 08:24 AM

What transmission? If a TH400, you will need the bolt-in high hump. I have the 73-up stands in my '70 with a 700R4 with no floorpan clearance problems.

71Farmtruck · 02-14-2008, 11:12 AM

I am using a TH350 out of a 79 suburban. The cross member I found was off a 69 or 70 GMC that had a 350/TH350, whether it was original I dont know. My 71 was originally a six cyl with a 3spd manual, I had to cut out the riveted in crossmember because of how far forward it was, now that you mention it, I think it was lower in the center, however I trashed it. Can you please describe the "high hump" part of this crossmember?

11-05-2007, 02:04 PM	#1
71Farmtruck Junk Junkie Join Date: Oct 2007 Location: Humble, TX Posts: 123	Help with clamshell mount stands in a 71 I am trying to install the later model motor mount stands in my 71 pickup, the top two bolts line up on the top of the c frame, but the two on the X-member do not. Can I drill the holes and mount it like that and maintain the correct geometry?

11-05-2007, 06:02 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Help with clamshell mount stands in a 71 To the board. This thread should help. http://67-72chevytrucks.com/vboard/s...d.php?t=128765 __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

11-07-2007, 01:56 PM	#3
71Farmtruck Junk Junkie Join Date: Oct 2007 Location: Humble, TX Posts: 123	Re: Help with clamshell mount stands in a 71 Thanks for the welcome and your help, much appreciated. I look forward to discussing and sharing tech ideas and issues.

11-08-2007, 10:02 AM	#4
71Farmtruck Junk Junkie Join Date: Oct 2007 Location: Humble, TX Posts: 123	Re: Help with clamshell mount stands in a 71 So why do the newer style engine mount stands need to have its bolt holes elongated for the mount? It wont bolt up correctly without some adjustment or what???

02-14-2008, 04:08 AM	#5
71Farmtruck Junk Junkie Join Date: Oct 2007 Location: Humble, TX Posts: 123	Re: Help with clamshell mount stands in a 71 Ok, after a short hiatus I have picked up my project. I followed the thread's instructions and got the engine stabbed, I am now having a problem with the tranny contacting the floor pan when the X-member and trans mount is installed, I have contact where floor pan meets the firewall, and the tailshaft contacts the floor pan. Should I loosen the mounts, lift the engine and see if the engine will sit down some, or modify my X-member to bring the mounting point down some? I need about 1/2 to 3/4 of an inch to clear the floor pan.

02-14-2008, 08:24 AM	#6
gringoloco A guy with a truck Join Date: Sep 2005 Location: Germany, for now Posts: 5,920	Re: Help with clamshell mount stands in a 71 What transmission? If a TH400, you will need the bolt-in high hump. I have the 73-up stands in my '70 with a 700R4 with no floorpan clearance problems. __________________ -Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy

02-14-2008, 11:12 AM	#7
71Farmtruck Junk Junkie Join Date: Oct 2007 Location: Humble, TX Posts: 123	Re: Help with clamshell mount stands in a 71 I am using a TH350 out of a 79 suburban. The cross member I found was off a 69 or 70 GMC that had a 350/TH350, whether it was original I dont know. My 71 was originally a six cyl with a 3spd manual, I had to cut out the riveted in crossmember because of how far forward it was, now that you mention it, I think it was lower in the center, however I trashed it. Can you please describe the "high hump" part of this crossmember?



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