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4L60E transmission failure

uconnjack

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uconnjack Enthusiast

uconnjack

Posted
Posted

Hi, I have a 2008 4WD Avalanche with about 130K miles and (I assume) the 4L60E transmission.  We just drove it from CT to Orlando with no issues, but while driving it on International Avenue, heard a loud bang/clunk and lost transmission engagement (in Drive).  Coasted into a gas station, turned the car off and back on, and started going through the gears.  Drive or 3rd wouldn't engage, but did engage in 1st and 2nd.  Drove forward in 1st then 2nd, hear another clunk/bang (not as loud), and then Drive and 3rd "worked" again (except I think it was still in 2nd gear).  However, now Reverse won't work (feels like there is resistance, but won't move), and is actually engaged and moves forward while in neutral!?!  Wasn't far from the resort so was able to limp back in 1/2 gears.  Noodling around, I am seeing a broken reverse band or sprag or maybe solenoids, as possible culprits, but none seems to totally fit, but then again, while I can do most of my own mechanical work on my car, tranny's are out of my wheelhouse.

 

Before I bring it to a shop to get diagnosed, I was hoping someone could help educate me on the 4L60E and/or give me some ideas what the issue may be so I can discuss it intelligently with the mechanic, generally understand their diagnosis, and make sure I don't get ripped off.

 

And if anyone here is from the Orlando area, any advice on trusted/reasonable mechanics would be appreciated, as well as any rough ideas of cost to replace or rebuild the tranny?  And while I would normally not go to them, I am also thinking whether I should go to a chain store transmission shop or a dealership so I might have some recourse if I have any future problems with a repair once back in CT.   Thoughts?

 

Thanks in advance!

02suburbanZ71 Senior Enthusiast

02suburbanZ71

Posted
Posted

Definitely sounds like the sunshell. Thats common on the 60e. You’ll need a rebuild if thats the case. I upgraded to the beast sunshell but now theres an even better one, I can’t recall the name.


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SILVER SLED Senior Enthusiast

SILVER SLED

Posted
Posted

Like was mentioned probably sunshell. It's no quick fix, but as often as they fail I'd bet any trans shop has a lot of experience replacing.  

  • 2 weeks later...
  • 3 weeks later...
carkhz316 Enthusiast

carkhz316

Posted
Posted

So what did you find out OP? Also, what gears actually work (if you've not had it fixed yet)? A broken sunshell will cause loss of 2nd, 4th, and reverse. 1st and 3rd will work fine.

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