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I have a 99 suburban that shifts hard in overdrive

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The one time I had this problem with an automatic transmission was when water got into the transmission fluid. I had it drained and all new fluid put in and it was fine again. Hope this helps.

Posted on Oct 24, 2012

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Posted on Jan 02, 2017

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SOURCE: not shfiting right

eric sounds like you have a electronic trans mission or computer controled trans.is the check engine light on ?

second it sounds like your trans is in limp in mode ( only has second gear).

the hard shifts is not good news.

somtimes when the controller sets a code that forces limp in it has to be cleared.

dis-connect the battery for a few min. then try it again see if it shifts but be easy on it and make sure fluid level is good.

if it it still messes up CHA CHING hehe i'll fix it fer 1000 bucks

Posted on Jan 27, 2009

  • 1 Answer

SOURCE: transmission shifts hard ,overdrive light flashes

I had a similar problem which turned out to be caused by a leaking vacuum line.

Good luck!
Brent

Posted on Apr 11, 2009

  • 70 Answers

SOURCE: 99 suburban when hot shifts hard ,let it cool down

i agree with morroso92 -an aftermarket trans cooler is always a good idea-i had a 1987 buick century purchased with 100K miles installed a decent size tranny cooler , changed the ATF several times at first(to get the fluid fairly clean) and then i used MOBIL 1 ATF and also installed LUBEGUARD (for trannies-red bottle) aloong with changing gasket and filter.the car had the original tranny and it was still perfect when i junked the car at 250K miles. just so you know the MOBIL 1 ATF is about $6.00 per qt. the bottle of LUBEGUARD is about $12.00. many trans rebuilders and mechanics swear by LUBEGUARD. IT ACTUALLY DOES WORK AND CAN HELP TRANNY PROBLEMS LIKE SHUDDERING,SHIFTING PROBLEMS,ETC.i have used it many times.

Posted on Sep 01, 2009

morse008
  • 1111 Answers

SOURCE: 99 tercel auto trans seems to slip?

sounds like a vacuum issue possibly look over all your vacuum lines for dry-rot as well as any broken ones this will cause such an issue as well as many other areas to check could also be a stuck sensor

Posted on Sep 06, 2009

gordanddar
  • 477 Answers

SOURCE: not shifting into overdrive and check engine light

I'm not a lexus guy , but I'm thinking that you have a vacuum leak somewhere.

Posted on Nov 06, 2009

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Not shfiting right


eric sounds like you have a electronic trans mission or computer controled trans.is the check engine light on ?

second it sounds like your trans is in limp in mode ( only has second gear).

the hard shifts is not good news.

somtimes when the controller sets a code that forces limp in it has to be cleared.

dis-connect the battery for a few min. then try it again see if it shifts but be easy on it and make sure fluid level is good.

if it it still messes up CHA CHING hehe i'll fix it fer 1000 bucks

Dec 20, 2008 | 1996 Chevrolet Suburban

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There is an overdrive fuse in the fuse compartment on the drivers side door panel, check and see if its blown, if it is there was some problems with the overdrive shift wire touches the bottom of the tranny pan, and can cause the fuse to blow out.

Jun 23, 2008 | 1999 Chevrolet Silverado 1500

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