| Governor parts list, THM 425 tranny [message #83458] |
Fri, 07 May 2010 10:24  |
Surbo
Messages: 213
Registered: February 2004
Karma: 0
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Senior Member |
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Howdy;
I have put up a pdf file on the photo site of the parts list for the governors in the THM 425 tranny. Follow the tag code for each tranny, for the vehicle it was used in. You will note the differences in the parts list of weights and springs. Most of the governors I have looked at have a tan colored spring for one weight,light tension, and a purple spring for the other weight, heavier tension. These changes must have been for shift point mph changes and line pressure changes in conjunction with the modulator.
I am about to do some experimenting with changing the weight of the weights, probably by drilling a hole in them, to see if I can raise the mph shift points. This should also be able to be done with the spring tensions, or a combination of the two.
Here is the link to the pdf file;
http://tinyurl.com/23me3dn
Bob Drewes in SESD
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| Re: Governor parts list, THM 425 tranny [message #83479 is a reply to message #83458] |
Fri, 07 May 2010 11:50  |
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wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
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| Surbo wrote on Fri, 07 May 2010 10:24 |
Howdy;
I have put up a pdf file on the photo site of the parts list for the governors in the THM 425 tranny. Follow the tag code for each tranny, for the vehicle it was used in. You will note the differences in the parts list of weights and springs. Most of the governors I have looked at have a tan colored spring for one weight,light tension, and a purple spring for the other weight, heavier tension. These changes must have been for shift point mph changes and line pressure changes in conjunction with the modulator.
I am about to do some experimenting with changing the weight of the weights, probably by drilling a hole in them, to see if I can raise the mph shift points. This should also be able to be done with the spring tensions, or a combination of the two.
Here is the link to the pdf file;
http://tinyurl.com/23me3dn
Bob Drewes in SESD
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You are the man Bob!
Wally Anderson
Omaha NE
75 Glenbrook
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| Re: [GMCnet] Governor parts list, THM 425 tranny [message #83483 is a reply to message #83458] |
Fri, 07 May 2010 11:51 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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Bob,
Bill Bramlett has been recommending for years the boring of 4 (or 5?) 1/4"
holes in each of the governor fly weights. Problem is, I don't remember
what new shift speeds result. He'll be glad to tell you.
Ken H.
On Fri, May 7, 2010 at 11:24 AM, Bob Drewes <bmdrewes@iw.net> wrote:
>
>
> Howdy;
>
> I have put up a pdf file on the photo site of the parts list for the
> governors in the THM 425 tranny. Follow the tag code for each tranny, for
> the vehicle it was used in. You will note the differences in the parts list
> of weights and springs. Most of the governors I have looked at have a tan
> colored spring for one weight,light tension, and a purple spring for the
> other weight, heavier tension. These changes must have been for shift point
> mph changes and line pressure changes in conjunction with the modulator.
>
> I am about to do some experimenting with changing the weight of the
> weights, probably by drilling a hole in them, to see if I can raise the mph
> shift points. This should also be able to be done with the spring tensions,
> or a combination of the two.
>
> Here is the link to the pdf file;
>
> http://tinyurl.com/23me3dn
>
> Bob Drewes in SESD
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: Governor parts list, THM 425 tranny [message #83486 is a reply to message #83485] |
Fri, 07 May 2010 12:53 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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| g.winger wrote on Fri, 07 May 2010 12:47 |
Bob, how'd you get the cover apart, just bending?? Can it be bent back?? Got up early before work and removed one and looked up the cover and can,t figure out how it can't work?? No shifting into 2nd. PL
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what Bill Bramlet does is grind down the edge until it comes apart. he drills the holes and glues it back together with RTV. when installed the clip helps hold it together.
Fred V
'77 Royale RB 455
P'cola, Fl
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