Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

4l60e won’t shift into 4th OD with new aluminum pan1997 k1500

Recommended Posts

4l60e won’t shift into 4th OD with new aluminum pan 1997 k1500 5.7 4x4.


Trans was working fine with original steel pan. It is original to truck with 209k currently. I have done the oversized TCC valve 20k ago due to p1870. 


I just installed a new aluminum 2 7/8 deep pan. Now trans won’t shift into OD and eventually lights SES with p1870. 


Checked fluid hot in park idleing and it’s at the correct mark. 


4l60e is the older one case design with bell housing molded into case. 


See below pics of Dents Dimple in steel pan.


Valve body adjustment?


solenoid adjustment? 


Or need new valve body?

Edited by 2009GMC
Link to comment
Share on other sites

Going to put original pan on today and I bet it will shift into 4th OD fine. 


The wear marks on the original pan must allow high mileage trans to shift into 4th. 


I want to use my new deep finned aluminum pan but guessing I need and adjustment or valve body or complete rebuild?



Link to comment
Share on other sites

Update. Truck shifts fine with original pan. I’ve noticed deep pans from tci have these small dimples like my stock pan. 


Careful buying on ebay. Pan was only $53.99 and all aluminum. Also sold on amazon. I started a return will see how it goes. 




Edited by 2009GMC
Link to comment
Share on other sites

New pan didn’t come with extension. Old pan was 2.5” deep on inside. New aluminum pan is 2.75” deep. 


I think it has to do with the design on the sides. Not designed correctly for the solenoids to operate?



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Content

    • By Brendan Corr
      Hello all, i have a 2002 2500hd 6.0/4l80 combo. The truck is blackbear tuned and has been for nearly 10,000 miles. I recently converted the truck to 4x4 with the drive train out from under a 2007 classic. The transmission was a GM reman with little to no miles on it. I dropped the pan, changed the filter and filter o-ring. Then filled with some dex6. The other day i was driving up a fairly steep grad (i-70W), truck was preforming normally trans at around 190-200F when all of a sudden it started shifting crazy hard and getting warm. I scanned it and pulled the dreaded P1870 transmission component slipping No CEL or any other codes. The trans will shift fine when cool until about 175, then it goes back into like a protect mode and will heat over 200F in a couple miles (still have all gears and shifts during this, just very very hard shifts and no lockup.). I have all gear shifts except lockup even when cool. The fluid is still bright pink and has less than 3000 miles on it with no burned smell. My current plans are to pull the trans, change converter and the trans cooling lines as i'm sure the rubber flex joints have collapsed as well as flush both the aux cooler and cooler built into the radiator. Is there anything else i should be doing, or anyone with a similar problem that they've resolved? Any input will be greatly appreciated.
      -Brendan Corr
    • By Jaroas
      I have a 2001 silverado, CEL came on, then at the next red light the tranny slipped out of gear and would not go into any gear. Let it set @ 15 minutes, restarted and worked fine or a few minutes then started slipping again. At stop sign could feel a pulsing in the transmission. Set code P1870. Any help will be greatly appreciated!
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    Total Topics
    Total Posts
  • Member Statistics

    Total Members
    Most Online
    Newest Member

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.