| [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343257] |
Sun, 12 May 2019 01:33  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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If you order a transmission from ANY rebuilders. And I mean any of our vendors. Or local shops. These vendors order torque converters from convertor rebuilders. Our original converters used 3 - 3/8 course SAE bolts. I've seen some of these convertors that have 10MM threads. A 3/8 bolt will screw into the 10MM hole just fine. As the SAE bolt is .019 inch smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can threaten the integrity of the connection years later. I DO NOT care who built the trans, or who is going to install it. Get a 10MM coures bolt. And test the size for yourself. If the bolt goes in fine. It's 10MM for sure. If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get by some of the best. DO NOT let anyone stop you from this test. Could cost YOU a lot later. Not them. Bob Dunahugh
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| Re: [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343259 is a reply to message #343257] |
Sun, 12 May 2019 07:25  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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SO TRUE! We even found metric threads in some of the torque converters
Manny had shipped to my place for his rebuilds.
BE CAREFUL!
Ken H.
On Sun, May 12, 2019 at 2:33 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> If you order a transmission from ANY rebuilders. And I mean any of our
> vendors. Or local shops. These vendors order torque converters from
> convertor rebuilders. Our original converters used 3 - 3/8 course SAE
> bolts. I've seen some of these convertors that have 10MM threads. A 3/8
> bolt will screw into the 10MM hole just fine. As the SAE bolt is .019 inch
> smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can
> threaten the integrity of the connection years later. I DO NOT care who
> built the trans, or who is going to install it. Get a 10MM coures bolt. And
> test the size for yourself. If the bolt goes in fine. It's 10MM for sure.
> If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get by
> some of the best. DO NOT let anyone stop you from this test. Could cost YOU
> a lot later. Not them. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343260 is a reply to message #343257] |
Sun, 12 May 2019 07:28 |
Dave Stragand
Messages: 307
Registered: October 2017
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So if you do end up with one tapped for metric... should you just use the appropriate metric bolt, or would it be better to tap and helicoil it to the correct standard thread size?
> On May 12, 2019, at 8:26 AM, Ken Henderson via Gmclist wrote:
>
> SO TRUE! We even found metric threads in some of the torque converters
> Manny had shipped to my place for his rebuilds.
>
> BE CAREFUL!
>
> Ken H.
>
> On Sun, May 12, 2019 at 2:33 AM Bob Dunahugh via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> If you order a transmission from ANY rebuilders. And I mean any of our
>> vendors. Or local shops. These vendors order torque converters from
>> convertor rebuilders. Our original converters used 3 - 3/8 course SAE
>> bolts. I've seen some of these convertors that have 10MM threads. A 3/8
>> bolt will screw into the 10MM hole just fine. As the SAE bolt is .019 inch
>> smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can
>> threaten the integrity of the connection years later. I DO NOT care who
>> built the trans, or who is going to install it. Get a 10MM coures bolt. And
>> test the size for yourself. If the bolt goes in fine. It's 10MM for sure.
>> If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get by
>> some of the best. DO NOT let anyone stop you from this test. Could cost YOU
>> a lot later. Not them. Bob Dunahugh
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
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1978 Transmode (403)
Pittsburgh, PA
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| Re: [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343261 is a reply to message #343260] |
Sun, 12 May 2019 07:51 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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The appropriate metric high-grade (9) torque converter bolt should be
readily available from any parts store; certainly any transmission shop.
DON'T just install whatever 3-5 grade bolt you can find! Else you'll be
justified in losing sleep worrying about having only 3 bolts restraining
all those Olds HP.
Ken H.
On Sun, May 12, 2019 at 8:29 AM Dave Stragand via Gmclist <
gmclist@list.gmcnet.org> wrote:
> So if you do end up with one tapped for metric... should you just use the
> appropriate metric bolt, or would it be better to tap and helicoil it to
> the correct standard thread size?
>
>> On May 12, 2019, at 8:26 AM, Ken Henderson via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> SO TRUE! We even found metric threads in some of the torque converters
>> Manny had shipped to my place for his rebuilds.
>>
>> BE CAREFUL!
>>
>> Ken H.
>>
>> On Sun, May 12, 2019 at 2:33 AM Bob Dunahugh via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> If you order a transmission from ANY rebuilders. And I mean any of our
>>> vendors. Or local shops. These vendors order torque converters from
>>> convertor rebuilders. Our original converters used 3 - 3/8 course SAE
>>> bolts. I've seen some of these convertors that have 10MM threads. A 3/8
>>> bolt will screw into the 10MM hole just fine. As the SAE bolt is .019
> inch
>>> smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can
>>> threaten the integrity of the connection years later. I DO NOT care who
>>> built the trans, or who is going to install it. Get a 10MM coures bolt.
> And
>>> test the size for yourself. If the bolt goes in fine. It's 10MM for
> sure.
>>> If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get
> by
>>> some of the best. DO NOT let anyone stop you from this test. Could cost
> YOU
>>> a lot later. Not them. Bob Dunahugh
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
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>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343280 is a reply to message #343262] |
Sun, 12 May 2019 13:39 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Our shop we try not to stock metric fastner , but we stock converter bolts
as we run into them frequently.
On Sun, May 12, 2019 at 7:19 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Just ran into this problem with a trans that Manny built. Someone here
> called me to say that the last bolt that he torqued striped out. I went to
> looked at the problem. We put a 10MM bolt in. And torqued to the proper FT
> LBS.
> Next you need to find out if a torque listing for a specific bolt.
> Is given for a lubed bolt, or dry. If that bolt called for a dry torque.
> And you lube it. Or put Lock Tight on it. You WILL over torque that bolt.
> There are charts out there that cover this. I pay close attention to this
> in the race engines, or GMC engines I've built. Many builders don't pay
> attention to this. Devils in the details. Yes. I get anal over this stuff.
> Bob Dunahugh
>
> ________________________________
> From: Ken Henderson
> Sent: Sunday, May 12, 2019 7:25 AM
> To: GMC Mail List
> Cc: Bob Dunahugh
> Subject: Re: [GMCnet] Tid bit. Caushion on transmission torque converter
> bolts on rebuilt trannies
>
> SO TRUE! We even found metric threads in some of the torque converters
> Manny had shipped to my place for his rebuilds.
>
> BE CAREFUL!
>
> Ken H.
>
> On Sun, May 12, 2019 at 2:33 AM Bob Dunahugh via Gmclist gmclist@list.gmcnet.org> wrote:
> If you order a transmission from ANY rebuilders. And I mean any of our
> vendors. Or local shops. These vendors order torque converters from
> convertor rebuilders. Our original converters used 3 - 3/8 course SAE
> bolts. I've seen some of these convertors that have 10MM threads. A 3/8
> bolt will screw into the 10MM hole just fine. As the SAE bolt is .019 inch
> smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can
> threaten the integrity of the connection years later. I DO NOT care who
> built the trans, or who is going to install it. Get a 10MM coures bolt. And
> test the size for yourself. If the bolt goes in fine. It's 10MM for sure.
> If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get by
> some of the best. DO NOT let anyone stop you from this test. Could cost YOU
> a lot later. Not them. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Tid bit. Caushion on transmission torque converter bolts on rebuilt trannies [message #343305 is a reply to message #343304] |
Tue, 14 May 2019 09:33 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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It is not an error. GM switched to metric threads in their transmissions
about 1975. But, not in all plants at the same time. When they were
switching from Dyna-flow and the iron case 4 speed Hydramatic and 2 speed
Powerglide to more modern designs like the 350 and 400 series, some plants
tooled up with metric specs. Just what they did.
Jim Hupy
On Tue, May 14, 2019, 7:23 AM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I've checked 3 transmissions that Manny did. 2 need metric torque
> converter bolts. One needs SAE bolts. These are what Manny ended up having
> been delivered to him. Manny did nothing wrong here at all. This is
> happening to all trans rebuilders. This is an error that can happen to any
> trans installer. You need to check these for yourself. Or bring this to the
> attention of your installer. As most don't deal with these older vehicles.
> Bob Dunahugh
>
> ________________________________
> From: Bob Dunahugh
> Sent: Sunday, May 12, 2019 1:33 AM
> To: gmclist@list.gmcnet.org
> Subject: Tid bit. Caushion on transmission torque converter bolts on
> rebuilt trannies
>
> If you order a transmission from ANY rebuilders. And I mean any of our
> vendors. Or local shops. These vendors order torque converters from
> convertor rebuilders. Our original converters used 3 - 3/8 course SAE
> bolts. I've seen some of these convertors that have 10MM threads. A 3/8
> bolt will screw into the 10MM hole just fine. As the SAE bolt is .019 inch
> smaller then the 10MM bolt. This 3/8 SAE bolt in that 10MM hole. Can
> threaten the integrity of the connection years later. I DO NOT care who
> built the trans, or who is going to install it. Get a 10MM coures bolt. And
> test the size for yourself. If the bolt goes in fine. It's 10MM for sure.
> If that 10MM will not screw in. It's 3/8 SAE course hole. Seen this get by
> some of the best. DO NOT let anyone stop you from this test. Could cost YOU
> a lot later. Not them. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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