Auto trans. to manual questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

airdale94 · 11-13-2007, 08:23 PM

Hi, I have a 68 C20. Originally a 6 cyl. manual trans., PO swapped a 283 TH350. I'm swapping back to a SM465, bought everything from a donor truck. I also bought a complete front "stub" from a 84 and swapped all that except for the crossmember. They were exactly the same except for the rubber brake hose mounting points.
I want to upgrade to newer style (clamshell) motor mounts. It looks like they will be in a middle position, as opposed to a forward (V-8) or rear (6 cyl.) position. Will I have to drill some new holes in the frame for my trans. crossmember? I'm thinking I will. How hard is this to do? Anyone have any experience with this? Should I just use the original motor mounts in the forward position for sb V-8? If I do, shouldn't the trans. crossmember bolt in the original location?

airdale94 · 11-14-2007, 05:33 PM

anyone?

**john** · 11-14-2007, 05:59 PM

Heres some info on the motor mounts. I was thinking the 4sp. trans used the bell housing x member which is removed when going to auto. Does your truck have one?

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

airdale94 · 11-14-2007, 08:21 PM

Yes the 4-speed crossmember will bolt to the bellhousing. It looks like I will have to drill holes if I go to the newer motor mounts. Thanks for the link

11-13-2007, 08:23 PM	#1
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Auto trans. to manual questions Hi, I have a 68 C20. Originally a 6 cyl. manual trans., PO swapped a 283 TH350. I'm swapping back to a SM465, bought everything from a donor truck. I also bought a complete front "stub" from a 84 and swapped all that except for the crossmember. They were exactly the same except for the rubber brake hose mounting points. I want to upgrade to newer style (clamshell) motor mounts. It looks like they will be in a middle position, as opposed to a forward (V-8) or rear (6 cyl.) position. Will I have to drill some new holes in the frame for my trans. crossmember? I'm thinking I will. How hard is this to do? Anyone have any experience with this? Should I just use the original motor mounts in the forward position for sb V-8? If I do, shouldn't the trans. crossmember bolt in the original location?

11-14-2007, 05:33 PM	#2
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Auto trans. to manual questions anyone?

11-14-2007, 05:59 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Auto trans. to manual questions Heres some info on the motor mounts. I was thinking the 4sp. trans used the bell housing x member which is removed when going to auto. Does your truck have one? 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/ Last edited by john; 11-14-2007 at 06:06 PM.

11-14-2007, 08:21 PM	#4
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Auto trans. to manual questions Yes the 4-speed crossmember will bolt to the bellhousing. It looks like I will have to drill holes if I go to the newer motor mounts. Thanks for the link



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