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Posted on Jan 24, 2018
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I have an 89 GMC automatic with over drive. The truck runs up to high rpms and then it shifts, is there some kind of regulator or vacumn line that may be causing this. it just started doing it lately. I like the truck and wondering if I should just change the transmision? it's a 2 wheel drive.

1 Answer

Bill Boyd

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  • GMC Master 53,816 Answers
  • Posted on Jan 24, 2018
Bill Boyd
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Joined: Jan 04, 2013
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Changing the transmission is not an option as it is working good
the problem will be an actuator or servo/solenoid
take it to an auto transmission specialist professional and have it properly diagnosed

5 Related Answers

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Oct 31, 2008

SOURCE: transmision shifting problem

Reverse is not sycronized, this means the gears have to stop to mess and not grind, two thing cause this, being to quick to slam into reverse after clutch is depressed, a problem with the clutch.

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Anonymous

  • 151 Answers
  • Posted on Dec 29, 2008

SOURCE: transmision wont shift out of 2nd gear

Maybe, but won't know till you take it too tranny shop. Even iif it is done a rebuilt is still cheaper than brand new. And, less you drive it now less damage done.

Firebird 67

  • 6 Answers
  • Posted on Feb 16, 2009

SOURCE: Front drive, 4 Wheel drive won't engage

Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel

dennymulford

Dennis Mulford

  • 1055 Answers
  • Posted on Jun 06, 2009

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Anonymous

  • 10 Answers
  • Posted on Sep 04, 2009

SOURCE: I have a 99 gmc sierra with 5.3 it takes about 7 seconds to start

Needs a valve adjustment. I assume its EFI, eliminating the possibility of the carb.

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Related Questions:

0helpful
1answer

What would cause my 05 GMC ENVOY TRANSMISSION TO NOT WANT TO CHANGE GEARS ALSO THE RPMS REV HIGH AND TRUCK WONT HO OVER 60 MILES PER HOUR WHAT CAN BEVTHE PROBLEM?

There could be several issues that could cause your GMC Envoy's transmission to not shift gears properly and the RPMs to rev high. Here are a few potential problems that you may want to consider:
  1. Low transmission fluid: If the transmission fluid is low, it could cause problems with the shifting mechanism. You'll want to check the transmission fluid level and add more if needed.
  2. Faulty shift solenoid: The shift solenoid is responsible for directing transmission fluid to the appropriate gear. If the solenoid is faulty, it could cause shifting problems.
  3. Worn transmission bands or gears: If the transmission bands or gears are worn, it could cause the transmission to not shift properly and the RPMs to rev high.
  4. Clogged transmission filter: A clogged transmission filter can restrict the flow of transmission fluid, causing shifting issues.
  5. Faulty transmission control module (TCM): The TCM is responsible for controlling the transmission. If it's not functioning properly, it could cause shifting problems.
I would recommend having a mechanic diagnose and fix the problem for you. It's important to address transmission issues promptly, as they can lead to further damage if left unchecked.
0helpful
1answer

Okay next to the vacuum that runs to the booster is another smaller on. It has no line and when my truck is idle it runs at 3k rpms and when I shift it drops and jerks to 1200 rpms

Have you tried plugging the small opening to see if the rpm comes down? Also look for a vacumn hose that has come loose and is lying out of sight.
0helpful
1answer

My 2005 GMC Envoy has a high RPM and will take forever to shift gears it will not get passed 70 mph, i have to let go off the gas for it to change gears...any ideas?

Hi, with most vehicle there may be a problem that you can identify, yours may have a few issues. I think you would benefit from a visit to a trans specalist to check the box over then go from there once that issue is sorted or discounted as the cause of problems. Your description appears complex/compound...i.e. there are possibly a few things going on at the same time
0helpful
1answer

Automatic transmission shifts at high rpms (3500+) All gears seem to work fine.

You mean you can drive your car but the problem you have hard shifts at high rpms (3500+) . what shift 1 or 2 or 3 ....... and how if your engine cold or hot .
1helpful
1answer

2000 s10 4.3 6 cyl automatic. hesitates to hit 2nd gear. revs high with no power then eventually kicks in and is fine.

had same problem on 74crewcab the vacumn line was tee d into another giving low vacumn . when it did reach sufficent pressure the trans would shift but the engine rpm was very hjgh and result was it slammed the trans in gear. Inspect your vacumn hose from modulator to the intake manifold/carb itcould be leaking or some one may have rerouted by accident.it must have a vacum draw equal to manifold pressure to shift in time with the actual rpms of the engine hope this helps...that it shifts at all makes me thinnk the modulator valve is working --just the vacumn line(s) arenot draw full manifold pressure
0helpful
1answer

1991 Jeep wrangler 2.5 standard shift.vacumn lines from transfur case to front drive axle.we need a picture of where each vacumn hose goes. a print out of the colors. thank you

i just boought a 1992 Jeep Wrangelr sport with a chevy 305 V8 and its a automatic with a standard 4 wheel drive and i put in 4 wheel drive and the front tires wont move what is wrong????
0helpful
1answer

I cant red line the car in drive

I doubt you will red line that motor if you have an automatic. with a stick shift you can blow it to pieces in 1st and 2nd. But,, sad to say, An automatic kind of protects itself and the engine by shifting at a decent RPM
0helpful
1answer

Trans not shifting

your transmission has a vacumn modulator on the side it requires vacumn from the engine to shift make sure the vacumn hose from the trans to the engine is plugged on and working, if that is correct then step 2 is the governer which would require a tranny shop to check, but id bet on the vacumn line give it a try! good luck and thankx billy
0helpful
1answer

1986 GMC Jimmy 4WD problem

Rich. There is a vacumn engagement of the front differential. The switch is on the transfer case. There will be a vacumn motor(looks like a curise control unit if you're familiar with them) under the hood with a cable running to the front diff. Make sure it functions when you engage 4wd. Probably does. If not, make sure it is getting vacumn by removing the line. It should **** on your finger when covered. If this all works properly, you could have trouble in the front diff. Don't forget the simple stuff, like CV joints, axle nuts tight, etc. You're driving an 86 so I assume you have a little experience in maintaince. Good luck. TJ
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