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Re: [GMCnet] new engines for the GMCs [message #316534 is a reply to message #316530]

Mon, 24 April 2017 09:13

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

The torque converter bolt issue is an operator caused one. About the same
time in production that GM went to METRIC wheels on trucks and HD 4 x 4
stuff, they also went to METRIC in their transmissions. Some of those
METRIC torque converters found their way into TM-425 aftermarket. They use
METRIC bolts on the torque converter. Due to inattentive technicians, or
inexperienced technicians, USS bolts left from OE torque converters found
their way into the assembly. They "kinda" fit for a couple of threads, and
then just lock up without clamping the flex plate to the torque converter.
Bad stuff happens quickly, here. I have fixed a couple of these in my shop,
and advised some owners over the phone with similar problems. The mismatch
is complicated by rebuilders painting their converters the wrong color, and
installers assuming that a converter is USS instead of METRIC because of
the color. Verify the converter by testing the bolts before assembly.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

On Apr 24, 2017 6:43 AM, "Mike Sadlon" wrote:

> I will let others play with the diesels. Manny is the only one who can
> work around the torque vs, 425 trans. I have heard they have sheared the
> torque
> convertor bolts. If I have heard wrong someone let me know.
>
> The HT383 would be right there on power. With some options on upgrades. If
> I needed a engine tomorrow, It is what I would do.
>
> I speced the Hybrid with pistons to work with the stock truck heads. The
> CI increase to 427 would add all the low end torque we could ever need. And
> should make a really nice torque curve.
>
> I'm going to start with a pan that will clear the 4 inch stroke. That way
> all options could be on the table. From turboed 350 to 440 small block
>
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		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 13:55
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		Re: [GMCnet] new engines for the GMCs By: James Hupy on Thu, 20 April 2017 13:54
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		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 18:29
		Re: new engines for the GMCs By: kerry pinkerton on Thu, 20 April 2017 20:00
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 20:07
		Re: [GMCnet] new engines for the GMCs By: USAussie on Thu, 20 April 2017 17:42
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 18:08
		Re: new engines for the GMCs By: kerry pinkerton on Thu, 20 April 2017 18:27
		Re: new engines for the GMCs By: kerry pinkerton on Thu, 20 April 2017 18:31
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 18:32
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 18:37
		Re: new engines for the GMCs By: Hal StClair on Thu, 20 April 2017 18:52
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 19:08
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 19:12
		Re: new engines for the GMCs By: Mike S on Thu, 20 April 2017 19:15
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		Re: new engines for the GMCs By: Chris Tyler on Mon, 24 April 2017 08:14
		Re: new engines for the GMCs By: Mike S on Mon, 24 April 2017 08:42
		Re: [GMCnet] new engines for the GMCs By: James Hupy on Mon, 24 April 2017 09:13
		Re: new engines for the GMCs By: jhbridges on Mon, 24 April 2017 11:12
		Re: new engines for the GMCs By: Mike S on Mon, 24 April 2017 20:17
		Re: new engines for the GMCs By: kerry pinkerton on Mon, 24 April 2017 21:05
		Re: new engines for the GMCs By: TR 1 on Tue, 25 April 2017 09:33
		Re: [GMCnet] new engines for the GMCs By: Dolph Santorine on Tue, 25 April 2017 09:41
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		Re: new engines for the GMCs By: rcjordan on Thu, 27 April 2017 06:34
		Re: [GMCnet] new engines for the GMCs By: James Hupy on Thu, 27 April 2017 09:08
		Re: new engines for the GMCs By: jhbridges on Thu, 27 April 2017 11:22
		Re: [GMCnet] new engines for the GMCs By: James Hupy on Thu, 27 April 2017 11:41
		Re: new engines for the GMCs By: kerry pinkerton on Thu, 27 April 2017 14:51
		Re: new engines for the GMCs By: jhbridges on Thu, 27 April 2017 13:52
		Re: new engines for the GMCs By: kerry pinkerton on Sat, 29 April 2017 07:38

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