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4L80-E harsh 1-2 shift

Tookie

Tookie

Member
Messages
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Location
Port Vincent, Louisiana
Truck has had this problem around 4 years, learned to lift foot slightly
just before shift point - now gotta relearn how to drive it!
Background: changed wheel cylinders and calipers this week, had trouble
getting firm pedal afterwards and found out the ABS had to be activated
to completely bleed it. And you need a Tech-2 to do that. :mad2:
So, went to the dealer today (BTW, call around if you need to go to a
dealer, ones near my house cost 99.00 for diagnostic fee, and after discussing
the autobleed with them, they didn't seem to be very knowledgeable.
found one about 45 minutes away that charges 75.00 diag. fee, and knew
exactly what I was talking about when I mentioned the bleed problem.)
-----------------------------------------------------------------------
Went to the dealer today, had them cycle the ABS for me, pedal got a
bit better, I may rebleed now that I'm sure there is no air in the ABS system.
But, some better news - I asked the service manager, "so I'm paying
for an hour of diagnostic time, correct? And the autobleed will only take
around 5 - 10 minutes, so let me tell you about my hard 1-2 shift".
He agreed to check it out - it started shifting hard occasionally about 4
years ago, and within a 6 month time span, progressed to shifting
hard every time it went from 1st to 2nd. Tried pulling the ECM fuses,
disconnecting batteries, didn't help. One transmission shop thought I had a
broken accumulator spring, another that one of the check ball holes in the
valve body had worn and ball was sticking. I didn't let them open it, I didn't
believe it was mechanical problem. Dealer I was at today had a tranny
guy that recalled seeing something about hard shifts, dug up a TSB from
1998! Said that reflashiing computer with updated code could help.
Did the reflash, put around 100 miles on it since, shifting smooth
as butter. Can't be sure it will stay that way, but definitely proves
it's not a mechanical issue. :D

With tax, I paid 86.00 for them to autobleed and reflash, not bad
 
You just got me thinking, I have had some surging issues. Phoned the dealer and they charge 50 bucks for reflashing stock program. Sounds like it would be worth a shot.
 
HAve you had them run a real-time scan on the transmission. I had the same issues except with the 2-3 shift and all that was wrong what the TPS was shot and giving it the wrong info. stupid thing though the pedal was half way down at idle.. It's cheap to do and can save alot of headaches. I think it cost me a whole $35.
 
NO! your right, that was'int sarcasm at all!! (Did you notice the sarcasm)

Chill out. No need for your "bite me" comments.
 
You could look at it this way - If you need a reflash and it's $50, then that's $50 toward a Heath program. I guarantee you'll like it better than stock
 
Burning oil said:
NO! your right, that was'int sarcasm at all!! (Did you notice the sarcasm)

Chill out. No need for your "bite me" comments.
Click to expand...

You come into my post, offering nothing helpful, and being "sarcastic"
(That's the family friendly term I'll use here)
If my post won't help with your (or anyone else's) problem, so be it.
I just posted that my truck is fixed since the reflash.
And just so you know, torque won't make it shudder either.
It's hard to judge someones tone or intent over the net, so if you
just have a twisted sense of humor, and were trying to make a joke,:sad6:
 
You are right it is very easy to be misunderstood sometimes. I appoligize to you.
Glad your truck is fixed and thanks for posting your cure.
 
just a number said:
HAve you had them run a real-time scan on the transmission. I had the same issues except with the 2-3 shift and all that was wrong what the TPS was shot and giving it the wrong info. stupid thing though the pedal was half way down at idle.. It's cheap to do and can save alot of headaches. I think it cost me a whole $35.
Click to expand...

On the newer trucks, they used an APP (drive by wire), and it's something
I suspected on mine, but checking with an Ohmmeter showed a nice,
smooth progression - the APPs are I think in the 300.00 range, so it's
not something you want to change unless you're SURE it's bad :D
 
Burning oil said:
You are right it is very easy to be misunderstood sometimes. I apologize to you.
Glad your truck is fixed and thanks for posting your cure.
Click to expand...

I'm not usually that aggravated over something like that, didn't mean
to be an ass - guess I was still so excited over my truck shifting right
(after almost 4 years of having to let off the pedal just before it shifted)
I went overboard :D
 
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