Question about 1999 Chevrolet Suburban

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I have a 1999 chevrolet suburban and when it gets warmed up it shifts real hard but not all the time somedays it is really bad

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  • 44 Answers

Sounds like the modulator valve on the transmission. get it checked or you may be buying a new transmission soon. it might be as simple as a vaccum leak

Posted on Nov 03, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1999 suburban

Go to autozone.com, in their repair section do a search on wiring diagrams.

Posted on Jun 15, 2008

  • 6 Answers

SOURCE: heat blowing cold air in 2004 chevrolet suburban

With coolant full and engine hot,make sure both heater hoses are hot. If not replace thermostat. If they are, check the blend door for proper operation. Otherwise you may have a bad climate control module. Check both front & rear units.

Posted on Jan 27, 2009

  • 1118 Answers

SOURCE: 1999 Chevrolet Suburban ac selector door motor.

it should be under dash next to gas peddle on left end of heater box not that hard 2 screws and a plug. its called heater blend door actuator.

Posted on Jan 28, 2009

csmock132
  • 4669 Answers

SOURCE: 4l60e not shifting correctly

Do you have a check engine light coming on? Sounds like trans temp sensor. Have it scanned, it is an electrical issue to the transmission.

Posted on Mar 02, 2009

  • 2 Answers

SOURCE: After a long drive, especially

The hard shifting you are experiencing is caused by slight wear in the valve body in the transmission. It doesnt mean your tranny is bad though. This hard shift will only usually occur when the transmission temp reaches 93 degrees. So you could rebuild the valve body or sometimes a tranny flush is a temp fix.

Posted on Oct 15, 2010

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I recently got a automatic 1999 Chevy Suburban 1500. Right away I had to get a new steering column. It has always been a little difficult to shift (pulling it down from park to reverse, drive etc). To


check the shift adjustment at the bottom of the steering column as it may have slipped or be slipping. Check the linkage on the side of the box

Nov 15, 2013 | 1999 Chevrolet Suburban

1 Answer

88 suburban suddenly won't shift into drive,other gears are fine


As dependable as all the old suburbans must be, they can't defy GM's planned obsolescence schemes forever. I was trying to help a friend keep his '78 suburban's lighting going. It ran great, but looked like half the stuff under the dash had been broken at one time, and patched back together. The wiring was a real colorful mess.
All you can do with the automatics is check the level and condition of the fluid. Never let it run low for long, or it will burn out. If the fluid looks burnt or dark brown, it's probably bad. You would want to have a shop or transmission shop verify or diagnose it to be sure, because rebuilding yours is a huge expense, just as a rebuilt one you could find would be expensive. A used one? You are always taking chances with a used transmission- it's real iffy. Lots cheaper, if you want to roll the dice, lol. Its your call. How fond are you of your suburban? .

Nov 06, 2013 | 1997 Chevrolet Suburban

2 Answers

I have 99 silverado it hard shifted from first to second and now wont shift


change trans fluid @ filter first, does it still drive ? if it does I'm thinking a stuck valve. was it acting up like a bad step child before this ? you know, its free to have a trans shop test drive & inspect the trans , thats what I would do. they'd know real quik. save you time & stress.

Feb 23, 2013 | 1999 Chevrolet Silverado 1500

2 Answers

After a long drive, especially in warm weather my 1999 Silverado shifts really hard going from first to second..then it goes away ..might be a heating problem?


The hard shifting you are experiencing is caused by slight wear in the valve body in the transmission. It doesnt mean your tranny is bad though. This hard shift will only usually occur when the transmission temp reaches 93 degrees. So you could rebuild the valve body or sometimes a tranny flush is a temp fix.

Sep 22, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Chevy suburban has a ''first 5 minutes'' knock


All kinds of things can go wrong after a flood so thats hard to diagnose through an e-mail. Your shift solenoids are on the valve body in your transmission. Your computer shifts the tranny. More than likely you have a 4L60E.

Mar 08, 2010 | 1999 Chevrolet Suburban

1 Answer

4x4 service light comes on


common problem,most times it is the TRANSFER SHIFT CONTROL MODULE,a real pain to replace,iif you need more help get back to me

Nov 12, 2009 | 1999 Chevrolet Suburban

1 Answer

Trasmission slippage


the trans will have to come out to be torn down and looked at

Jan 16, 2009 | 1999 GMC Suburban

1 Answer

1991 Chevy Corvette Hard shift at warm up. 1 and 2


I assume you have a 700 R4 trans. Check your throttle linkage. Sounds like it's out of adjustment, maybe loose in the holding bracket.

Jan 08, 2009 | 2001 Chevrolet Corvette

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