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09-22-2014, 11:11 AM
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#1 |
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Registered User
Join Date: Jun 2010
Location: Bear Grass, NC
Posts: 291
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hard 1-2 shift fix
I have a 2006 GMC and just today the transmisison started shifting really hard from 1st to 2nd gear. Check engine light is also on. The truck is a 2006 GMC Sierra 4 wheel drive with a 5.3 liter V8. Any ideas?
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09-22-2014, 09:22 PM
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#2 |
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Registered User
 Join Date: Apr 2008
Location: Milton wi. 53563
Posts: 128
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Re: hard 1-2 shift fix
yes i had that same problem in 05 gmc k1500. valve body in transmisson is culprit. take it to a transmission shop. google problem. it cost me 300 dollars, fluid, filter,and parts and labor. old money.
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09-25-2014, 10:36 PM
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#3 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: hard 1-2 shift fix
What Codes are set?
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09-26-2014, 08:43 AM
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#4 |
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Registered User
Join Date: Apr 2008
Location: Milton wi. 53563
Posts: 128
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Re: hard 1-2 shift fix
1870 i think, trans.componet slipping.
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09-26-2014, 08:35 PM
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#5 | |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: hard 1-2 shift fix
Quote:
The most common cause is the Isolation-PWM Converter Valve has worn the Bore that it rides in. The Actuator Feed Limit Bore wears as well, The controls pressure to the ISO-PWM Conv. Valve. Sonnax makes fixes for both, Requires the Valve Body to be reamed for oversized valves. The Tool kit for both bores are around $800, So its not something a DIY'er wants to pay entry price for. VBX is owned by Sonnax & will have all the updates, http://valvebodyxpress.com/prodView.php?theId=65 |
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