not shifting won't switch into third gear?

150,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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MULIUS22
  • MEMBER
  • 2 POSTS
My truck revs but doesn't accelerator past 25/30 mph, won't switch into third gear?
Nov 4, 2019 at 12:09 PM
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SQM
  • ✓Experienced Mechanic
  • 6,383 POSTS
Hello,

In order for the transmission to shift it will require certain amount of transmission fluid pressure. So, it is always a good idea to check the fluid level make sure it is correct and in good condition.
Also, if the transmission oil pump is weak it might not provide sufficient pressure and the transmission will have shifting issues.
This can also be due to faulty shift solenoid.

Take a look at this article, it covers the basics of automatic transmission issues:

https://www.2carpros.com/articles/automatic-transmission-problems

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
Oct 25, 2021 at 3:44 AM
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