Question about Pontiac Sunfire

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4 speed automatic Transaxle

Changed drivers side half shaft and now has no forward gears or reverse. What may cause this?

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  • Pontiac Master
  • 632 Answers

If it was moving prior to this repair then most likely the axle isn't fully engaged. This would make all the power go to that wheel and render the vehicle motionless. Make sure you got the right axle and that it engages into the final drive.

Posted on Apr 18, 2014

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Posted on Jan 02, 2017

dgjtex
  • 405 Answers

SOURCE: 1999 ford taurus automatic wont go into any gear -engine is fine

Just a couple of things to check if you haven't compare the smell and apearance of the tranmission oil to so new, if it looks dark and smell burned you probably have a bad transmision, clutches or burned up. Does it whine or make any noise? a stopped up filter will do this. also is it full when warm on the dip tick runniing in park?

Posted on Dec 31, 2008

csmock132
  • 4669 Answers

SOURCE: There is no reverse,but all of therest of gears work, this a automatic

You will need to replace or rebuild the transmission.

Posted on May 05, 2009

ghost4548
  • 776 Answers

SOURCE: hyundai excel 1996 automatic will engage reverse

It appears you have a Forward Clutch FAILURE. Replace the trans after you get it diagnosed and verified by a professional technician. By the way, do you have a Check Engine light? If so, what is the diagnostic code? The dealership can scan the system and find any codes which may have been stored in the TCM (Transmission Control Module). If there were any 'Incorrect Gear Ratio" codes, it's most probably the trans itself.

Posted on May 28, 2009

Molson02536
  • 3854 Answers

SOURCE: transmission will not shift

Check the Vehicle Velocity Sensor (V V S)-(Speed Sensor) or the wire harness to the VVS. IF the ECM is not getting a signal from the V V S, the PCM can not give the signal to switch gears. The V V S is on the drivers side of the end ot the transmission that is held on by one bolt. Best thing to do is to have the truck scanned at Auto Zone for a DTC code and to confirm that the V V S has gone bad and they can give you the step by step instruction to replacing the sensor and takes about 15 min to do. Good luck and keep me posted. Keep an eye on the transmission fluid, make sure you don't run the transmission to hard and burn it out over a $40.00 sensor which is better then $1,800 for a transmission replacement. 

Posted on Jun 22, 2009

autotherapis
  • 501 Answers

SOURCE: i changed transmision fluid of toyota sienna 1998

Changing the fluid will never harm your trans unless you do not fill it back up.

Reverse is all hydrolic. There is no electrical that could cause it. If you have park and forward, you don't have a lincage problem.

As much as I feel for you, (I satarted rebuilding transmissions in the 80's) you will have to get it rebuilt.

Sorry

Posted on Sep 03, 2009

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What are common problems that cause the tranny to shift harshly when engaging or shifting into rev. On a 95 one ton dually 2 wd automatic with a 454 big block


What most people see as a harsh transmission shift when transitioning from forward gears to reverse gear is really just the drive train taking up the slack in the connections. You need to realize that over time the universal joints in the drive shaft, as well as the pinion and ring gears in the rear differential will experience wear. When you are going forward the drive shaft is turning one direction, the u-joints and differential gears are all taking stress one one particular side. When you shift to reverse, everything reverses. So, the first thing to happen is the front u-joint changes direction. There will be a small amount of slack in the joint from wear. This slack will cause an irregular motion while it is taken up. This irregular motion is propagated to the rear u-joint, which must do the same. It will induce additional irregular motion, which is passed to the pinion and ring gears in the rear differential. In a new car/truck, you won't hardly notice this since all the wear surfaces are new and at factory tolerances. Give the vehicle 60-100K miles or more of hard wear and the result of this shifting to reverse can be a relatively loud clunking noise that can shake the vehicle. Replacement of u-joints can alleviate some of the issue, but the rear end wear can only be addressed with replacement. But as we say.....if it ain't really broke, why fix it?

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The transmission startedwith a loud clunking noise when shiftinginto reverse. It progressively got worse until it no longer moved in reverse.The lady had her son change the fluid but did not mention if he...


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2 Answers

Driveshaft


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