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4L60E delayed then firm 1-2 shift

Re: 4L60E delayed then firm 1-2 shift

Postby jps4wd [OP] » Apr 02 2013, 3:05pm

well it took a little longer to get a chance to look at my trans, but with the help of an ex-GM drive-train mechanic, we pulled the pan and valve body out of the trans and checked the 1-2 accumulator, the housing and all the valves in the valve body. ended up finding that the 1-2 shift valve had a decent size burr on one of the larger "rings". he sanded the burr down in hopes that was the problem, but it turns out that it didnt change anything. he also didnt see anything glaringly wrong, ie no clutch material or excessive metal in the pan. he said without having a code or something glaringly obvious that i would just be really wasting money on parts trying to guess what the problem is. so it looks like i am stuck with a funky shift until something just goes completely wrong, which in that case, he said he would rebuild it for me for basically the cost of the parts and some Jack.
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Related Topics  Tranny delayed shift   diablo intune firm shift   4l60e shift cable bracket   4l60e won't shift past 2nd   related 4l60e jerking / soft shift   Chevy 4L60e transmission shift at low temps.   Want to firm up my handling a bit   Brake pedal is more firm when engine is cold   hard accel and shift to 2nd 1-2 shift   Chrome bumper caps with fog lights $200 shipped firm   will a 98 4l60e interchange with a 96 4l60e   4l60e Question   4l60e tuning   Cooling the 4L60e 
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Re: 4L60E delayed then firm 1-2 shift

Postby FightinTexasAggie » May 04 2013, 5:46pm

I am having the exact same thing...06 chevy as well. And on the accumulator piston note...they are not all aluminum. GM used plastic as well. Idk why they would do this. But anyways next weekend im going to drop the pan and valve body and replace the TPS and see where that leads. Does it do it at all RPM's? it seem like on mine whenever I get in the higher rpm band it shifts smooth but if I'm just normal driving it "bumps" and firm shifts into 2nd
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Re: 4L60E delayed then firm 1-2 shift

Postby jps4wd [OP] » May 06 2013, 10:22pm

FightinTexasAggie wrote:I am having the exact same thing...06 chevy as well. And on the accumulator piston note...they are not all aluminum. GM used plastic as well. Idk why they would do this. But anyways next weekend im going to drop the pan and valve body and replace the TPS and see where that leads. Does it do it at all RPM's? it seem like on mine whenever I get in the higher rpm band it shifts smooth but if I'm just normal driving it "bumps" and firm shifts into 2nd


i actually just traded that truck in this week so i no longer have to deal with it :D . but to answer your question, it did shift smoother if it was higher in the RPMs and much worse at real low RPMs. i had found a good take off speed that minimized the hold and bump but it never went away. i also thought about changing the TPS as i had read that could be a culprit but i never got around to it. if you replace the TPS and that fixes it, please post it up so others will know
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Re: 4L60E delayed then firm 1-2 shift

Postby Trey_Crittenden » May 18 2013, 3:48pm

I know that you no longer have the truck but My 2000 was doing the same exact thing. I replaced all of my shift solenoids and that didn't fix it. Got tired of guess work and took it to my mechanic and he fixed it. On my truck it turned out to be a Line Pressure Solenoid and now it shifts smoother than it ever did and my truck has 205k miles on it.
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Re: 4L60E delayed then firm 1-2 shift

Postby gmc2007 » May 20 2013, 11:51pm

My 07 does the same thing, had the fluid changed... there was nothing in the pan, barely anything on the magnet.... I learned to put up with it, but it is a terrible transmission in reality
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Re: 4L60E delayed then firm 1-2 shift

Postby gmcultr » May 21 2013, 12:22am

^fluid doesn't just disappear...
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Re: 4L60E delayed then firm 1-2 shift

Postby gmc2007 » May 21 2013, 4:19am

gmcultr wrote:^fluid doesn't just disappear...


Meant like foreign material like clutch fragments, metal shavings etc... it was clean like new in there....
2007 GMC Sierra SLT Z71
Airaid MIT with K&N filter, MBRP Cat Back Exhaust
HID 6000k Low Beam, Silverstar Ultra High's
LED's all over, Tonno Pro Tonneau Cover,
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Re: 4L60E delayed then firm 1-2 shift

Postby gmcultr » May 21 2013, 4:45am

Oh haha...
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Re: 4L60E delayed then firm 1-2 shift

Postby Erik598 » Nov 13 2013, 6:15pm

I experienced the same delay and hard shift from 1-2 on my 2003 silverado. The bulletin 09-07-30-017B describes the problem, which is the 1-2 accumulator valve.

For the complete bulletin, I have provided the link: http://ww.w.autoelectricpro.com/purchas ... 110282.pdf
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