LB7 Performance Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines Related To Performance And Longevity

Transmission upgrade

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Old Jul 19, 2010 | 11:15 AM
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Default Transmission upgrade

The next step for my truck has got to be a tranny.. My stock ally is hating life right now. I have it narrowed down to Suncoast, ATS, or Gorearend.. I been leaning towards a Gorearend... Any thoughts or advice would be awesome!!
 
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Old Jul 19, 2010 | 11:54 PM
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We have had great luck with Suncoast on the Allison Transmissions.


Luke
 
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Old Jul 20, 2010 | 11:45 AM
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Suncoast all the way they got it down!!! Our shop truck(jim's) is running 11's and sled pulling all the time with his stage 4 and has not missed a beat!
 
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Old Jul 22, 2010 | 02:23 PM
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Suncoast stage 4 is the way to go. I have had no issues with mine for nearly two years now. Its held up like a champ for everything I have put it through.
 
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Old Jul 25, 2010 | 07:18 AM
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On a different note, what would you guys recommend for a truck that will have roughly 450 ponies to the wheels? whole tranny, or just TC, valve body and shift kit?

sorry for the stupid rookie question, but i am not too educated with trans
 
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Old Jul 29, 2010 | 01:00 AM
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Suncoast is some of the best they have a nice D-max kit and for 450HP its not worth it to do the whole thing just the basic rebuild kit a TC (thats the weak link) and a shift kit
 

Last edited by big bad diesel 416; Jul 29, 2010 at 05:28 PM.
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Old Jul 29, 2010 | 02:54 AM
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Originally Posted by big bad diesel 416
Suncoast is some of the best they have a nice D-max kit and for 450HP its not worth it to do the whole thing just the TC (thats the weak link) and a shift kit
No, the TC is a weak link but not the main one. The C3 clutch pack is the weak link the ally tranny. I would recommend getting a P-2 Planetary Spacer, Modified C3 Pressure Plate, C3 Frictions & Steels, Converter Lockup valve and shift kit. You can all of that for about 650 bucks get 50 back in a core charge.

And Dodge Boy go back to where you belong.
 
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Old Jul 29, 2010 | 03:54 AM
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Would it be wise to upgrade the TC as well, just for safe measure, or would I be wasting my money doing that as well???
 
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Old Jul 29, 2010 | 04:04 AM
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Originally Posted by smokeeaterlb7
Would it be wise to upgrade the TC as well, just for safe measure, or would I be wasting my money doing that as well???
Oh yes, do it at the same time. You dont want the old TC to mess with the fresh tranny.
 
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Old Jul 29, 2010 | 01:34 PM
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Originally Posted by TruePerformanceDiesel
No, the TC is a weak link but not the main one. The C3 clutch pack is the weak link the ally tranny. I would recommend getting a P-2 Planetary Spacer, Modified C3 Pressure Plate, C3 Frictions & Steels, Converter Lockup valve and shift kit. You can all of that for about 650 bucks get 50 back in a core charge.

And Dodge Boy go back to where you belong.
and yes you are right about the forward clutches they do burn up if you do a shift kit and bump up the line pressure there is no need to replace the c3 pressure plate and replace that converter it is junk

AND THIS DODGE BOY KNOWS TRANNIES
 
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