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car wonít shift into fourth and over drive is gone

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car wonít shift into fourth and over drive is gone

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Old 08-14-2018, 08:47 AM
  #1  
Axellopez
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Default car wonít shift into fourth and over drive is gone

Ok so just recently I had a mechanic remove my differential because the old one was messing up he installed everything but didnít mark the drive shaft and differential he just put the drive shaft in and now it wonít shift into fourth and uses 3rd as overdrive
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Old 08-14-2018, 10:21 AM
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99GTvert
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What year is your car, and is it an auto? Which auto specifically? Was the driveshaft also removed from the transmission or just from the differential?

What does the mechanic have to say about this? Because I wonder if this is electronic related, as I'm not sure how removing the driveshaft from the diff (and possibly the transmission) would make it not shift into OD.
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Old 08-14-2018, 10:51 AM
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Urambo Tauro
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I wouldn't worry about the flanges not being marked. The driveshaft is balanced separately, apart from the pinion flange. Besides, an imbalance would result in driveline vibrations, not shifting trouble.

If this is an automatic, check the shifter linkage and the MLPS switch mounting.
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Old 08-14-2018, 01:08 PM
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GT Nate
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the OD off button isn't pushed in on the shift lever is it?
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Old 08-15-2018, 07:03 AM
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Axellopez
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Yes itís a auto and no it wasnít disconnected from the transmission just from the differential
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Old 08-15-2018, 07:04 AM
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Axellopez
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No when I turn off over drive it does nothing
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Old 08-15-2018, 10:28 AM
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Z28KLR
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O/D indicator light flashing or anything like that?
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Old 08-17-2018, 02:09 PM
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Axellopez
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Ok so I was told that since the speedometer isnít working correctly it might be that and thatís why it canít shift into fourth correctly could it be the speed sensor ?
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Old 08-19-2018, 07:51 PM
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dawson1112
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Originally Posted by Axellopez View Post
Ok so I was told that since the speedometer isnít working correctly it might be that and thatís why it canít shift into fourth correctly could it be the speed sensor ?
Yes the speedometer needs to be working correctly for the car to shift properly. Even with my manual trans when they installed the wrong year t45 in the car and the speedo didnt work the engine would surge and sputter once in awhile when coming to a stop or inbetween shifts.
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