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#1
03-25-2003, 10:50 PM
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Can someone tell me what the dimensions of torque converter bolts are? I went to put my old ones in, and noticed their thread size was a tad small, as they had "rattled" around, and banged the threads on the flexplate.... I would like to avoid from this happening in the future, lol. thanks, George
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George Hill '63 Star Chief, '95 Chevy P/U, lots of BMW motorcycles and cars |
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#2
03-25-2003, 10:50 PM
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Can someone tell me what the dimensions of torque converter bolts are? I went to put my old ones in, and noticed their thread size was a tad small, as they had "rattled" around, and banged the threads on the flexplate.... I would like to avoid from this happening in the future, lol. thanks, George
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George Hill '63 Star Chief, '95 Chevy P/U, lots of BMW motorcycles and cars |
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#3
03-26-2003, 04:58 AM
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Use thread locker, Loctite, or lock nuts. Allen Wrench makes a locking bolt with teflon patch, or teflon ball inserted in the threads. I tear down twice a year, and I use nyloc nuts, a nut with nylon locking ring. With any of these thread locking materials, alway use new each time. For the street use a thread locking liquid, or a crimped locking nut, these are nuts put under pressure to distort them slightly, there are many on market. Don't know exact size, but I think your problems happened after they come loose. The bolts gets worn when this happens it will make the holes in flexplate larger, making proper bolt fitting impossible,
    BIGGERISBETTER-15 yrs in NHRA tech ret.
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NHRA tech. "Its just a 412, I swear it". Pontiac tip of the year, quit those damn cigarettes. 
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#4
03-26-2003, 07:05 AM
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tikiklubracing, The style I have is where the bolt actually threads into the torque converter itself, not to a nut on the backside.
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George Hill '63 Star Chief, '95 Chevy P/U, lots of BMW motorcycles and cars |
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#5
03-26-2003, 10:46 AM
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If it's a factory converter,I think it's a 7/16" fine thread bolt.
If it's aftermarket,hard to say.A lot of them are different. johnta1 Pontiac Power RULES !!! www.wallaceracing.com 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#6
03-26-2003, 02:46 PM
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Make sure you measure the threads. Just like the factory used on my '80 Firebird, my aftermarket converter used METRIC bolts.
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#7
03-26-2003, 07:44 PM
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Depending on the trans,most GM converter bolts are 3/8" course.
If your original bolts were metric,it will have a number with a decimal point in it, IE: 8.8 . If your converter is metric,the American bolts will thread right in.Make sure you go in a few turns and see if the bolt wobbles.If it does,go to a metric bolt. I think the metric size is 10mmx1.50(not sure)> The difference between in-laws and outlaws-outlaws are wanted
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The difference between inlaws and outlaws? Outlaws are wanted |
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#8
03-26-2003, 07:52 PM
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I bought some 7/16" Fine thread bolts and they wouldnt begin to thread in.... meanwhile I went to AutoZone to get some Liquid Teflon, and in their help section they have converter bolts so I bought them. The screwed in nicely.... 10mm x 1.5 did it. Thanks for the help, George
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George Hill '63 Star Chief, '95 Chevy P/U, lots of BMW motorcycles and cars |
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#9
03-28-2003, 01:39 PM
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Liquid Teflon is a lubricant not a locking device. You don't want to use a lubricant you want to use a thread locking device like Locktite. Make sure you use the blue locktite as the red makes it extremely difficult to remove. Those three bolts are transferring a lot of torque this is a critical fastener application. Make sure you use grade 8 bolts.
Tim C 65 LeMans, 3600lb. all steel, full interior, D-ports and a flat tappet cam, 11.01@120
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Tim Corcoran |
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