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snkr32
Novice

Jan 12, 2010, 10:37 AM

Post #1 of 6 (2309 views)

shifting	Sign In

i am new here.i have 2000 gmc 4x4 and will not shift from 2wheel drive to 4wheel drive on the fly. it is pushbutton style.been to tranny shop and had front diff. and transfer case checked.still have same problem.anyone with info about this would be greatly apprec.

way2old
Veteran / Moderator
way2old profile image

Jan 12, 2010, 5:18 PM

Post #2 of 6 (2288 views)

Re: shifting	Sign In

Are all the tires the same size? These need to have all 4 tires the exact size.

Being way2old is why I need help from younger minds

snkr32
Novice

Jan 13, 2010, 12:59 PM

Post #3 of 6 (2279 views)

Re: shifting	Sign In

all tires are the same size.they are about 3 months old.but thanks for taking the time to investigate it.

way2old
Veteran / Moderator
way2old profile image

Jan 13, 2010, 5:11 PM

Post #4 of 6 (2273 views)

Re: shifting	Sign In

Is the solenoid getting any current so it can work? Also there is a vacuum switch on the transmission that has a metal ball in it as a check valve. This can hang and cause your problem. That should have been checked by now though.

Being way2old is why I need help from younger minds

snkr32
Novice

Jan 14, 2010, 8:32 AM

Post #5 of 6 (2266 views)

Re: shifting	Sign In

snker 32 hear again.and yes that has all been checked. it will go in 4 wheel drive if i use reverse but will not shift on the fly. used to work fine.it really has me puzzled.i had a very good transmission guy tear it all apart and it has him puzzled too at a very pricy bill.anyhow thanks again.well appreciated

snkr32
Novice

Jan 15, 2010, 5:04 PM

Post #6 of 6 (2259 views)

Re: shifting	Sign In

i just wanted to let you know i found the priblem.it was the module located under the dash go figure.thanks for your time.much appreciated

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