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#4614127 - 12/25/17 06:46 PM 4l80e
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
Ok guys Iím back again. Lol. I think I may have finally solved my problem but wanted some advice before I started tearing things apart. So my 99 burb k2500 7.4l with 4l80e trans started losing reverse one day, it was slow to engage, then the next day it was completely gone, no feeling whatsoever of it engaging. Then 4 or 5 days later I went to take a short trip to the auto parts store and it was like my truck was locked in 4wd low and had a very very noticeable delayed shift from 1-2. So I turned right around and parked it and have been researching the cause ever since. That was about a month ago and I think I may have finally found out what the source of my issue is. Iíve been reading a lot about my components and I think itís the torque converter that is causing my problems. Back in late summer I had an issue with it feeling like I was driving over tiny speed bumps, something I now find out to be converter shudder, something back then I thought to be transfer case issues, I pulled the front drive shaft and my problems seemed to go away, until a few weeks later when reverse started going out. I donít drive the truck much so maybe thatís why it seemed to take so long for it all to come to this conclusion and for me to put all of the symptoms together but I think thatís what it is. Any and all feedback would be appreciated. Especially so from mr Clinebarger, if he would be so kind as to chime in. Lol. You were a great help to me before thank you. I think my tcase needs a new motor as it still switches from 2wd to 4wd on the switch on its own but I canít get it to switch from 4wd to 2wd by pressing the button. I can hear it trying to switch, and I can feel it, as it makes the vehicle lurch when doing so but it will not engage 2wd when I press the button. I think it needs a new switch(button) as well as the motor. Hopefully not a new or rebuilt tcase. This 4l80e was bought used and installed by yours truly so I may have screwed up somewhere as it was my first ever tranny swap, sounds like it wonít be the last time I pull a tranny if it is truly the TC acting up. Oh, I replaced solenoid A and B and the fluid was already quite dirty in the pan after less than 5000 miles of use. No metal pieces but quite a bit of ďmudĒ. I cleaned the pan and the magnet and topped it off with Dex VI after replacing the solenoids but no change. That was my first and cheapest repair option and a chance to inspect the valve body and the pan. I didnít replace the filter because it was new when I installed the trans. Any help? Ideas? Anything besides R&R? Iíve still got the original bad 4l80e that was the reason for all of this starting last winter. If nothing else, Iíll take it to the shop and have it rebuilt to clinebarger specs and reinstall it myself. That should cut the bill in half at least I would guess. Thanks in advance everyone
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614133 - 12/25/17 06:53 PM Re: 4l80e [Re: 99Burb454]
ls1mike Online   content


Registered: 06/14/08
Posts: 5117
Loc: In the Garage...
How many miles?

Sure sounds like you are going to have it rebuilt. Converter shudder is not a big deal depending on how much and when it occurs.
Sounds to me like you are losing line pressure, perhaps you have a bad pump or it just worn out.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4614137 - 12/25/17 07:03 PM Re: 4l80e [Re: 99Burb454]
maxdustington Offline


Registered: 01/21/17
Posts: 634
Loc: Toronna
NV4500/5600 swap time!
_________________________
03 Jetta AWP/09A 200k kms
TGMO 0W20 "Legend" & Hella Magnet Filter

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#4614138 - 12/25/17 07:05 PM Re: 4l80e [Re: 99Burb454]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
***update***
So, after posting the original post I got to thinking, thatís not always a good thing lol, I went outside and put the 4wd fuse back in and reverse tried to engage but there was a grinding noise, like when you try to put a manual in gear but donít have the clutch fully depressed. So I put it back in park but the grinding noise stayed so I shut the truck off and restarted it and the noise went away but then it wouldnít try to engage reverse again. But no grinding noise this time when shifting to reverse. Now Iím confused again. The noise is coming from the firewall area so I assume itís the TC making the noise but why would me putting that fuse back in have anything to do with the TC? I didnít try to drive it to see if the issue with the delayed shifts was still present, I wanted to wait for your input. Thanks again in advance for any and all help
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614145 - 12/25/17 07:13 PM Re: 4l80e [Re: ls1mike]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
Shudder isnít a big deal probably to most but it sure felt like the truck was going to come apart the couple times that it happened. It was as if the truck was driving one wheel at a time, like the wheels were stepping instead of rolling. Lol. It spooked me pretty good cuz when it happened I had just gotten on the interstate a couple days after having a wheel literally come off of the thing. But that was due to my laziness and not rechecking the torque on the lugnuts on the wheel spacers. Luckily it happened as I was backing out of my driveway and not on the interstate at 85 mph. Smh. Iím at a loss now and am back to thinking itís something electrical since reverse engaged when I put the 4wd fuse back in. Help!!!! Lol
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614149 - 12/25/17 07:21 PM Re: 4l80e [Re: 99Burb454]
ls1mike Online   content


Registered: 06/14/08
Posts: 5117
Loc: In the Garage...
Do you have any codes?

Based off what you have told me about your fluid change and looking at your 35 inch tires I am still going with rebuild time.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4614152 - 12/25/17 07:34 PM Re: 4l80e [Re: 99Burb454]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
If it is the TC you're going to have to pull it. Pull it and rebuild.
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

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#4614153 - 12/25/17 07:34 PM Re: 4l80e [Re: ls1mike]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
There may be some codes but I havenít chanced driving it to the auto parts store to get them. The CEL isnít lit because it was always lit because the truck doesnít have any cats so I removed the offending bulb. Lol. Wanting to get cats put back on it though to fix that problem. The cats were removed when I bought it. The service 4wd light is on until I put the fuse for the 4wd back in and then it goes out. Did you see the update?
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614154 - 12/25/17 07:36 PM Re: 4l80e [Re: Alex_V]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
I know Iíll have to pull it if itís the TC but Iím hoping the tranny is still ok in that case and a new converter will fix the problem. But now Iím not sure if anything again after the update to my post. Smh
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614167 - 12/25/17 08:01 PM Re: 4l80e [Re: 99Burb454]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
Ah forget it. Iíll just have the one Iíve got sitting in the garage rebuilt. Any recommendations on a TC? I was going to rebuild it myself but who am I kidding, Iíll never have the time for it. Iíll just have to hope the trans shop will do what I ask them to do as far as mods go. I should probably buy the parts for the mods and take them to them with the trans though I would think donít you? As far as the extra drilled holes and whatnot Iíll just have to hope they do it. Or tear the thing down once I get it home to make sure. Man Iím at a crossroads here. Lol
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4614168 - 12/25/17 08:02 PM Re: 4l80e [Re: 99Burb454]
NYEngineer Offline


Registered: 12/12/06
Posts: 1570
Loc: NY, NY
I had a 4L60E computer go bad and not give the signal to raise the line pressure. If you rebuild the trans, get a new computer as well.
You will have to have it flashed by a dealer.

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#4614169 - 12/25/17 08:04 PM Re: 4l80e [Re: 99Burb454]
ls1mike Online   content


Registered: 06/14/08
Posts: 5117
Loc: In the Garage...
Do you love the truck?

Monster Transmission

I have had one of their FWD units in a S/C 3800 was a good transmission.
_________________________
Mike
00 Trans Am WS6 5.7 LS1
02 Silverado 2500HD 6.0
14 Caprice PPV 6.0
15 Malibu LTZ Turbo
12 Passport TT

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#4614170 - 12/25/17 08:05 PM Re: 4l80e [Re: 99Burb454]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
You can ride on the exception to this rule for a long time, but the rule still stands: spend money to keep it in good shape, a (proper) repair or two at a time, or spend more money when all the band-aids or budget fixes come to a head at once.

You can get by removing bulbs, installing well-used transmissions, and making it look
big and bad before it's mechanically sound... until you can't.

I put a reman 4L80E from Street Smart transmission in a 1500HD 2 years ago and it's still working perfect 50K and a lot of abuse later. I'd look them up online and get a quote. Good shipping and warranty.


Edited by Alex_V (12/25/17 08:12 PM)
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

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#4614229 - 12/25/17 09:06 PM Re: 4l80e [Re: 99Burb454]
dogememe Offline


Registered: 04/15/17
Posts: 597
Loc: SF BAY AREA, CA
I would not buy a Monster trans, heard too many bad things. Same with Jasper.
_________________________
2007 Ford Crown Vic P71 4.6 ~124K Miles, Valvoline SynPower 5W-30, Royal Purple Filter *Daily Driver*
2010 Ford Escape 2.5 ~70K Miles, Valvoline SynPower 5W-30, Wix Filter *Turo Rental Car*

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#4614298 - 12/25/17 11:37 PM Re: 4l80e [Re: 99Burb454]
rubberchicken Offline


Registered: 07/07/08
Posts: 399
Loc: Maryland USA
I have a 97 K2500, 454 4x4 with 4l80e trans. Although it is a beater due to the paint problems, I do not have problems with the trans, other than this: if it sits for a very long time, it seems to be slow to go into gear the first time, regardless of D or R. It seems to take like 2-4 seconds to go into gear the first time. After that its fine.

Right now its sitting due to a blown front brake line that I will repair eventually. Not sure what I am going to do with it long term.

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