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MagicJen198326
MagicJen198326 Posted on Feb 24, 2016
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How to repair the 4 wheel drive unit!

My bf thinks the 4 wheel drive doesn't work properly on my SUV! It engages into 4 wheel drive just fine but it has lousy performance while driving and can't really tell it's in 4 wheel drive

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Bill Boyd

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  • Cars & Trucks Master 53,816 Answers
  • Posted on Feb 24, 2016
Bill Boyd
Cars & Trucks Master
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Joined: Jan 04, 2013
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Things to consider here are the lousy performance
if you have it in 4x4 and are operating on hard surface then the drive train torques up and that requires extra power to drive
it also requires a greater turning circle as the torque action is difficult to allow the cv "U" joints to turn in the not straight ahead position
4x4 is for poor traction surfaces where that torque action is released by the tires being allowed to skid on the low friction surfaces
4x4 is only meant for off road conditions or snow and ice

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My 2004 GMC Envoy SLT will go into four low but not for higher automatic four wheel drive and we'll also go into two wheel drive what's the problem
There are a few potential issues that could be causing your 2004 GMC Envoy SLT to go into 4-low but not 4-high or 2-wheel drive. Some possible causes include:
  1. Transfer case issues: The transfer case is responsible for controlling the engagement of the different drive modes. If the transfer case is damaged or malfunctioning, it may not be able to engage 4-high or 2-wheel drive.
  2. Shift motor issues: The shift motor is responsible for controlling the engagement of the transfer case. If the shift motor is damaged or malfunctioning, it may not be able to engage 4-high or 2-wheel drive.
  3. Vacuum issues: The vacuum system is responsible for controlling the engagement of the transfer case. If there is a problem with the vacuum system, it may not be able to engage 4-high or 2-wheel drive.
  4. Wiring issues: The wiring that controls the transfer case and shift motor can become damaged or corroded over time. This can cause the transfer case to not engage 4-high or 2-wheel drive.
  5. Control module issues: The control module that controls the transfer case and shift motor can fail. This can cause the transfer case to not engage 4-high or 2-wheel drive.
It's best to diagnose the issue by a professional mechanic, who can perform a proper diagnosis and repair the issue. They will be able to determine the specific cause of the problem and recommend the appropriate repairs.
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I have a 1997 isuzu rodeo the 4x4 indicator light stays on. Transfer case is working properly. SUV is definitely in 2 wheel drive. Is this a vacuum related problem
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Once you confirm that, check that the connector to the actuator switch is ok. It's mounted on the front axle on the drivers side. Check all the vacuum hoses attached to it as well.
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My 2004 GMC Envoy SLT will go into four low but not for higher automatic four wheel drive and we'll also go into two wheel drive what's the problem

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