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700r4 transmission no forward gears, only reverse?

Tiny
ALLYSA STORNELLI
  • MEMBER
  • 1990 CHEVROLET ASTRO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I just bought the vehicle listed above with the transmission disassembled. I rebuilt it, and put it in the van. It won't go forward in any gear, reverse works fine though. Fluid level is good, TV cable seems fine, although I'm not totally sure. The engine revs when I press the accelerator, but it just won't move. What could it be?
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Wednesday, June 7th, 2023 AT 8:58 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
It sounds like the first gear shift solenoid is not working or the gear range sensor is shorted and not telling the PCM it is in gear. Let's run the codes to see what comes up, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is how to change the gear range sensor in case you need it. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

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Wednesday, June 7th, 2023 AT 12:03 PM
Tiny
ALLYSA STORNELLI
  • MEMBER
  • 2 POSTS
I ran the codes, nothing comes up.
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Sunday, June 11th, 2023 AT 4:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
I have seen the gear range sensor cause this problem, here is how to change out the gear range sensor. Also did you use the same valve body as the old transmission?
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Monday, June 12th, 2023 AT 9:30 AM

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