2001 chevy s10 automatic 150,000 miles suddenly lost 3rd and 4th gears

The 4L60E transmission usually has a life of 150,000 miles. The "newer" transmissions are made a lot lighter and therefore weaker than the old workhorse TH350 and TH400 transmissions of the 70's and 80's. They had to make the transmissions with less metal to attain the ridiculous MPG requirements. I had to have mine rebuilt in my 04 Silverado at 165,000 and couldn't believe that they told me the average life was 150,000!

Time to have the computer scanned for trouble codes but it sounds like there is a problem in the transmission. Google is your friend also........

You have a C6 transmission, your sincros are bad you need to have the trans rebuilt... No way getting aroungd it. I use to work for Chrysler and Dodge as a tech.

It sounds like your clutch is slipping. It's an early warning sign that clutch is going to need to replaced soon.

It winds up in 1st and then shifts right from 1st into 3rd. Then never shifts into 4th. Plus rev is gone. You broke the sun shell. The transmission will need to rebuilt or replaced.

Hi:

Your transmission has 3 shift rails...
1st - 2nd
3rd -4th
5th- Reverse

If your 3rd gear doesn't work , you have an internal transmission problem, such as a syncronizer, or similar fail... There is not much you can fix, without removeing the transmission.

I had the same problem but eventually lost reverse. Had to get a new transmission... $2,300.00

CHECK THE AUTOMATIC TRANSMISSION FLUID.

based on the discription you may have a transmission that is failing, that is the weak link in this car model.

throw out bearing