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05-07-2018, 11:09 AM
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#1 |
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Registered User
Join Date: May 2011
Location: Fort Pierce, FL
Posts: 430
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72 THM 350 mount and bolt thread?
When reinstalling a crate 350 engine, I noticed my transmission mount had 2 different bolts to attach to the cross member. Since I had the Transmission rebuilt last year, I was surprised that the mount would use 2 different bolts. Or, either they lost a bolt or my truck had 2 different bolts when I brought it to them.
When I reinstalled the (different bolts to the mount, one of them wouldn't tighten up, it just turned and obviously it stripped. I went to buy a new mount from NAPA, and said I wanted to match up 2 bolts too, and the guy said that might be difficult to match those "odd" threads. What is the correct bolts for the mount to cross member? I couldn't get any SAE or metric to thread in easily. Maybe a course 3/8 would work, but it didn't thread in by hand. I don't want to strip out a new mount with the wrong bolts. Anyone else run into this? |
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05-08-2018, 12:36 PM
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#2 |
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Registered User
Join Date: May 2011
Location: Fort Pierce, FL
Posts: 430
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Re: 72 THM 350 mount and bolt thread?
I bought 2 bolts today that seem to be the right thread, 3/8 13 (or 14, I don't remember) and they seem to do the trick. Apparently the mount (Korea) has at best, rough threads cut in the mount.
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05-08-2018, 01:06 PM
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#3 |
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Senior Member
 
Join Date: Oct 2014
Location: New Palestine In
Posts: 930
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Re: 72 THM 350 mount and bolt thread?
The bolts that fasten the trans mount to the trans cross member are 7/16 14
__________________
Phil "Money is only a tool to create and achieve what you want most in life" PayPal: rodnrudy@comcast.net |
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05-08-2018, 01:09 PM
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#4 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: 72 THM 350 mount and bolt thread?
7/16-14 ...Read this,
 https://www.jalopyjournal.com/forum/...t-size.243192/
__________________
Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" 
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05-08-2018, 05:29 PM
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#5 |
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Registered User
Join Date: May 2011
Location: Fort Pierce, FL
Posts: 430
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Re: 72 THM 350 mount and bolt thread?
Yep, I got the wrong bolts. Actually, I didn't buy them. 7/16 14 is right, but they seemed tight and not wanting to thread in. I ran a tap and now they go in. From the article above, this seems to be a recurring theme.
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