4l60e hard shift issues.
Thread Starter
Teching In
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4l60e hard shift issues. I purchased a 2000 4l60e out of a Tahoe, 4x4.
Owner said he rebuilt it just 10k miles prior.
My issue is It shifts HARD from Park to R or from N to D.
I have been troubleshooting this for 2 weeks now, research online etc...
I've replaced the electronic pressure control solenoid (which would be n my first guess) in fact, I did a master solenoid kit with wiring harness.
I've replaced the 1-2 accumulater piston with sonnax pinless (1-2 was shifting hard, this helped a good bit with that.)
I've changed the TPS.
It shifts fine when driving... Mostly
And yes, the fluid levels are good. No leaks.
AND IT STILL SHIFTS HARD OUT OF P OR N...
Any ideas?
Thanks in advance...
John
Owner said he rebuilt it just 10k miles prior.
My issue is It shifts HARD from Park to R or from N to D.
I have been troubleshooting this for 2 weeks now, research online etc...
I've replaced the electronic pressure control solenoid (which would be n my first guess) in fact, I did a master solenoid kit with wiring harness.
I've replaced the 1-2 accumulater piston with sonnax pinless (1-2 was shifting hard, this helped a good bit with that.)
I've changed the TPS.
It shifts fine when driving... Mostly
And yes, the fluid levels are good. No leaks.
AND IT STILL SHIFTS HARD OUT OF P OR N...
Any ideas?
Thanks in advance...
John
TECH Junkie
Joined: Dec 2012
Posts: 3,615
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From: Iowa
Does it shift hard into R and into 1?
in your 2 weeks of troubleshooting I'm going to go out on a limb and assume you haven't bought a $30 pressure gauge and hooked it up to your transmission? You know...prettymuch the first test any forum google search will tell you to try.
in your 2 weeks of troubleshooting I'm going to go out on a limb and assume you haven't bought a $30 pressure gauge and hooked it up to your transmission? You know...prettymuch the first test any forum google search will tell you to try.
Thread Starter
Teching In
Joined: Sep 2018
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Thread Starter
Teching In
Joined: Sep 2018
Posts: 10
Likes: 0
Does it shift hard into R and into 1?
in your 2 weeks of troubleshooting I'm going to go out on a limb and assume you haven't bought a $30 pressure gauge and hooked it up to your transmission? You know...prettymuch the first test any forum google search will tell you to try.
in your 2 weeks of troubleshooting I'm going to go out on a limb and assume you haven't bought a $30 pressure gauge and hooked it up to your transmission? You know...prettymuch the first test any forum google search will tell you to try.
All other shifts are nml.
And yes, I read about installing the pressure Guage but for this specific problem some said it's useless as we KNOW there is high pressure if it is making my tires chirp from P-R Etc....
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Teching In
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When I researched my specific problem, hard shift from Park to reverse Etc, people would recommend putting a pressure line in there but others notoriously would say there is no need because you already know there's high pressure which is what's causing the hard shift. I'm not saying I know anything, I came on here to learn. If you have some useful information I'm happy to hear it, otherwise if I want smart alec I have three boys for that.
TECH Junkie
Joined: May 2012
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From: Poplarville, MS
You need to confirm that it has high line pressure. There are things that the builder could have done when the trans was assembled that would cause a hard engagement other than high line pressure. @Jays_SSZ28 touched on a few of them in post #4.
Thread Starter
Teching In
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You need to confirm that it has high line pressure. There are things that the builder could have done when the trans was assembled that would cause a hard engagement other than high line pressure. @Jays_SSZ28 touched on a few of them in post #4.
I replied to Jay's post, I have no earthly idea or any of those things mean. So that means this is out of my pay grade, I've got a great transmission place here in town I just hate conceding defeat. Thanks for the input
OK, I see, what I thought was that the hard shifting was from high line pressure but it was just a matter of finding out what was causing the high line pressure.
I replied to Jay's post, I have no earthly idea or any of those things mean. So that means this is out of my pay grade, I've got a great transmission place here in town I just hate conceding defeat. Thanks for the input
I replied to Jay's post, I have no earthly idea or any of those things mean. So that means this is out of my pay grade, I've got a great transmission place here in town I just hate conceding defeat. Thanks for the input
You're already too focused on the pressure being too high. Did you forget to mention it idles at 1300 rpm? Thats another possibility.
I find that a lot of people misdiagnose things because they're too focused on the most common problem. It's not always a common problem.
Thread Starter
Teching In
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I've read enough to learn that this has defeated you already. No offense intended, by saying this I'm trying to motivate you to stop throwing parts at this and just take it to a shop. It will probably save you money.
You're already too focused on the pressure being too high. Did you forget to mention it idles at 1300 rpm? Thats another possibility.
I find that a lot of people misdiagnose things because they're too focused on the most common problem. It's not always a common problem.
You're already too focused on the pressure being too high. Did you forget to mention it idles at 1300 rpm? Thats another possibility.
I find that a lot of people misdiagnose things because they're too focused on the most common problem. It's not always a common problem.
I have zero Knoledge of 4l60es other that what I have read over the last 2 weeks.
It seems like the troubleshooting list is a bit out of my range of inexpertise. I'm going to take it to the shop on Wednesday.
TECH Junkie
Joined: Dec 2012
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From: Iowa
When I researched my specific problem, hard shift from Park to reverse Etc, people would recommend putting a pressure line in there but others notoriously would say there is no need because you already know there's high pressure which is what's causing the hard shift. I'm not saying I know anything, I came on here to learn. If you have some useful information I'm happy to hear it, otherwise if I want smart alec I have three boys for that.
I told you some useful information...check the line pressure. make sure the pressure is too high. Otherwise there could be other things that cause hard shifting.
You chose to sidestep and ignore that information. So...since you know it all...do whatever you want.
Like others have stated...this appears to be above your pay grade. Take it to a shop and have it diagnosed.
The diagnosis may very likely be high line pressure...but they will confirm that, then take the necessary steps to determine the solution.
Cheers
Thread Starter
Teching In
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I've try to get ahold of the mechanic I bought it from a year ago to see what modifications he has done but haven't heard back from him.
Thanks for the input.
TECH Junkie
Joined: Dec 2012
Posts: 3,615
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From: Iowa
A broken fwd accum spring, a stuck abuse valve, etc...all of these would make sense but I find it pretty unlikely that both the fwd and reverse abuse valves are having issues. And reverse/fwd engagement firmness shouldn't depend on one another.
BUT I agree...I always keep fwd feed hole at .078 or smaller