4l80e shift problems

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4l80e shift problems

Home > Discussion Forum > Mechanic's Corner - Transmissions

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All Messages in Thread	Author	Date
4l80e shift problems	Ken	5-21-05
I own a 1995 motor home with a 4L80E tranny that at times will not shift out of first. This is an intermitant problem. Any ideas what the cause is?
Re: 4l80e shift problems	lostpioneer	6-22-06
No shifting out of first? The trans is electrical and needs power to shift. Make sure the fuse is clean if so it's in the ign switch were the trans gets it's power. tends to be common problem.
Re: 4l80e shift problems	Lee	5-19-06
I've got a 1998 chev 3/4 6.5td with a 3 speed o/d so i guess thats called a four speed? auto. mine will get up to about 90km/h then the speedometer will bounce down and the engine will rev up, if you stay on the fuel the tach will go from 2500rpm to 3500rpm redlined without feeling any power increase to the wheels at all I fiddled with the electronic boxes on the driver side of the tranny and it seemed to get worse then i drove it and it was better now today back to the 90km/h thing again, PLEASE HELP!!
Re: 4l80e shift problems	Bob	10-29-06
I have a 92 Chevy one ton 4x4, 454 with a 4L80E. The other day while pulling out of a parking lot at about 10 mph the tranny shifted out of overdrive and intoral or reverse (really not sure of N or R,just shocked it happened in the middle of a intersection), truck stopped and I pulled the shifter down into drive with pressure pushing up from the tranny. Drove the truck about 2 miles at 40 mph holding the shifter in drive and shifted to OD,rpm's went up 500 back down then up and lost that gear,put shifter in drive and that worked. Stopped at a Chevy dealer and they never heard of this problem and wanted to make a appointment with the tranny shop they work with. Got home and no reverse, let the truck sit about 3 hours started it up and everything works fine in the driveway. What do you think???
Re: 4l80e shift problems	Dale	10-6-08
I have a 1993 1 ton dually 6.5 turbo diesel with the 4180 tranny. At times it shifts hard but I have all 4 gears and it upshifts and downshifts normally until I turn the truck off. When I restart it I usually only have the first three gears and there is no downshift to second gear no matter how hard I press on the throttle. It is like the kick down is not working at all. After cooling down completely it might work properly the next time or not. I would really like to get this shifting properly all the time with out the very hard up shifts. I think is is an electrical problem and not mechanical.
Re: 4l80e	mehmet	5-9-07
I neeed ınformatıon about tests and troubleshootıng methods.
Re: 4l80e shift problems	Bil G	4-18-06
I have a 95 4l60e with 60 on trans I got on it and it was ok for about 20 min till it started acting like my brake were on when it shifted it to second.so i drove home in 1 st now I have no upshift.fluids clean and reverse and 1st are strong I replaced the whole throutel body and servos
Re: 4l80e shift problems	charles	11-14-06
I have a 2000 chev. 3500 with a 5.7 motor. The 4l80e will shift back to third and go into defalt between 55 and 65 mph. If i cruse at 70 mph it will stay in over drive. What can I do to fix this? Thanks
Re: 4l80e shift problems	gary scribner	10-22-05
I have the same problem as Chris did with a 4l80E, in my '99 K2500 suburban with a 454 (54K miles). Intermittently, truck does not want to go out of first gear. If you punch it -then it will upshift after letting foot off the gas. Also has problem of not wanting to go into overdrive from 3rd (seems to really be upshift issue for all gears). This first occurred one night when I drove the truck about 7 miles, stopped at traffic light, then truck would not get out of first. When restarting vehicle to make return trip, it upshifted fine. My mechanic, who I trust implicitly, changed out the speed sensors, but as far as I know, did not mess with the wiring or do any other work. he did of course change out the fluid. The tranny fluid and filter was changed at 42K miles. After work was done, wife made short trip (1 mile), tranny would not come out of first. On return trip, she said it shifted ok. I also had similar problem on slightly longer trip. Is the solenoid next - mechanic did not see anything else obvious, but then again -I am not sure you will see something obvious with this kind of problem. I have read that the computer might need to be reset. Any truth to that. Thanks.
Re: 4l80e shift problems	Mike Spreng	7-9-05
I have a 1993 chevy turbo diesel with a 4L80E tranny and i recently pulled the motor to replace a head gasket and ended up haveing to take the transmission out too, so here is the problem. I hooked everything back up and when i put it in drive and start to go the truck rocks back and forth before it shifts and it dont want to shift into overdrive. I took it to a tranny shop and he seems to think it is a shift solenoid, do you think it could be that or something else because i cant see how that could go bad just from taking it out and puting it back in, and if you think that is it where is it located inside or outside of the transmission if you could get back to me that would be awesome and i would really appriciate it. Thanks Mike
Re: 4l80e shift problems	Tranny Ed	5-25-05
Easiest and most likely place to start is to replace both speed sensors on the driver side of the trans. Also be sure the wire harnesses at the sensors are in great shape. Chevrolet makes new pigtail kits if yours are bad. athe sensors are about $20-$25 each and you can replace them yourself if you are mechanically inclined...Ed
Re: 4l80e shift problems	Chris	8-29-05
I have a 1998 Chevy Crew Cab Dually that won't shift out of first all of a sudden. Granted, last night, which was when this started, I did goose the heck out of it coming out of the driveway, but it drove fine the rest of the night. It was only when I returned home and left again about an hour or so later that I found the problem of high RPM's with no shifting out of first in D. It has reverse, so I wasn't thinking that I may have spun the part that I had done twice before in my 1995 w/a 4L60E called the sun shield?...Not too sure the name really. Does the guage fuse affect this at all as it does starting the truck because of oil pressure not being read?...I'm in a bind and need some help..FAST! Chris...Somewhere down in Texas
Re: 4l80e shift problems	rusty	9-29-05
Tranny ed makes the typical suggestion when you have too much money. start throwing money at it!! save your money and time,take it to a shop that has the proper diagnostic equipment
Re: 4l80e shift problems	james coleman	6-2-07
I have a 91 gmc 2500 6.2 diesel 4l80e trans it will not lock up the converter or shift overdrive i have changed the pigtail to the 96 modle and also shifts at 17 and 27 no matter what the throtle pisision is will not down shift computor shows no codes
Re: 4l80e shift problems	BILL	10-16-05
1996 C-1500 fresh rebuilt 4L60E, butwillnot go into overdrive. B&M shift improver kit installed also. Any answers would be helpful thanks. BILL
Re: 4l80e shift problems	Raphael	11-1-05
I have recently bought a used 03 Sierra 2500HD with a 4L80E tarns. After the stereo was replaced the transmission on occasion will go to 2nd gear and stay there. I took it to 3 transmission places to have it diagnosed and all 3 places thought it was a bad solenoid and the trany needs to be rebuild. Since the coincidence with the stereo replacement was too suspicious to me, I decided to check the wiring they did. Sure enough I found out that a fuse marked "IGN" was not making good contact. The trany worked fine since that was fixed. SO CHECK YOUR WIRINGS FIRST!
Re: 4l80e shift problems	dave	2-20-07
I have 96 gmc crew cab 454 4x4 with 4l80 trans 173000,never had aproblem of any kind with trans pull horse trailer weighs 17000 loaded. but changed fliud & filter every 25000 miles. thought you might want to hear something good about one. never been rebuilt. knock on wood
Re: 4l80e shift problems	Kevin	2-22-08
#1 check fluid level and colour. If its burnt brown change immediatly. #2 Check default shifts by removing fuse for tranny. Shifts will be hard but it will shift all 4 gears if no mechanical problem. #3 check wires to brake switch. Some trucks have up to 3 curcuits on this switch. TCC, Cruise control and brake lights. #4 check tranny control module ussualy found near computer under dash. #5 check both speed sensors. Output speed sensor is common problem if it is mounted in tranfer case (hummer h1) take it out and clean off all the iron filings that have built up. #6 Chech line pressures ??? #7 Drop the valve body and replace all solinoids and filter. 1-2 solinoids are prone to leaks and will cause many problems like loss of 4th. If none of that works and assuming your Injection pump(DS4) and the PMD are operational(no codes 1216 1217)its probably inside the tranny. Stator bushings, wave washers and pumps are likly and expensive and last resort. All previous tests can be done with a ratchet set an voltohm meter for free Hope this helps. 1997 Hummer H1 4door hard top nicely beaten to hell and back.
Re: 4l80e shift problems	Brian	8-12-07
I have a 73 k5 blazer 4X4 5.7L that won't shift out of 1st gear till you hit 40 MPH and when it is ideling in drive it makes this grinding/squeeling sound that seems like it is comming from the torque converter and i haven't checked any of the sensors so that is what i am going to do any sugestions
Re: 4l80e shift problems	justin	3-11-08
'95 k2500 suburban 5.7/4l80. about two weeks ago the speedometer started acting funny (the gear selector indicator light would turn off and the spedo and tach would go up approx 20 deg, after a few seconds the indicator light would come back on then the spedo and tach would dip way down then come back up to correct), now the shift indicator light dosent come on at all and i only have 2nd gear wether in D 3 2 or 1. park neutral and reverse work fine. i thought it might be a connection at the side of the transmission because i have a pretty bad oil leak at the rear main seal and all the wiring is covered with oil and road gunk, so i cleaned all of the connections but saw no improvement. from what im reading here it sounds like i should be looking for an electrical problem further from the tranny its self. i will be sure to post the answer to my problem as soon as i figure it out.
4l80e shift problems	Step	3-16-08
I have a 93 1 ton 4x4 pick up. It has a 4L80e tranny. It shifts fine through all of the gears and will up shift and down shift until you exceed 45 mph. When it is in the low side of the transfer case there is no problems at all. I pulled the codes out of the transmission and it comes up with code 68. Any clue as to why it down shifts back into 3rd gear until you shut the truck off ? Thanks... Step
Re: 4l80e shift problems	Jarod Davidson	8-31-08
This is a 1993 GMC 1 Ton 6.2L Diesel with a 4L80E Stock. I purchased a remanufactured tranny, new torque converter and replaced the cooler. After the exchange, the tranny went into rev and backed out, I put it into OD (as always) and it started shifting erradically after about 10-15mph. The speedo was bouncing as well. Thinking that I had the spd sensors reversed, I switched them, and the truck would not go out of 1st. Any help would be greatly appreciated. Thank you in advance, Jarod
Re: 4l80e shift problems	spencer	6-29-08
I have a 1994 c2500 6.5L TD with the 4L80E transmission that is having shifting problem simular to others listed here. It is stuck in limp mode till the engine is warmed up. once the engine is warm, it is inlimp mode for the first 0.8 miles and then it will start shifting as it should. As long as the truck doesn't cool down all the way it shifts fine for the remander of the day. had it at the dealers they replaced the vssb and check all the wires. after $400.00 they gave it back without it being repaired. they couldn't find the problem. it was not giving any codes. any help would be appreciated.
4l80e shift problems	joe	2-14-08
I have a 1995 chevy pu that has a 4l80e tranny and the reverse gear goes no where and neutral is a forward gear and when put in park when engine is reved it dosent go over 1500 rpm
Re: 4l80e shift problems	Peter Kohl	2-15-08
I have a 94 k 3500 6.5td and no reverse or overdrive.Tranny shop said probably a drum,1700.00 to fix.Ouch.can anyone explain,any chance to fix on my own or replace tranny with a used one? got to be a cheaper way
Re: 4l80e shift problems	Nol's	12-19-07
I have a '92 chevy 2500 4wd and the trans can't ID what gear it's in, all the forward gears work fine but i have no reverse, my neutral is a drive gear and when in park it seems to to want to lunge forward but doesn't actually move the truck. Any ideas?
Re: 4l80e shift problems	warren holland	10-19-07
93 gmc 2500 4wd 4l80e 1st thing in morning hard to shift out of 1st. after cycling through all gears 1 time warming up (couple of miles) it works fine.
Re: 4l80e shift problems	zachery wesly turner	11-21-07
IHAVE 95 1500 TURBO DIESEL SILVERADO REPLACED INJECTION PUMP ENG RUNS FINE NOW,BUT TRANNY IS IN LIMP MODE NO SSHIFT UP OUT OF 2OND. HELP
Re: 4l80e shift problems	JASON	11-10-07
I HAVE A 1995 CHEVY SILVERADO 2500 WITH THE 4L80E.THE TRUCK SHIFTS FROM FIRST TO 2ND FINE BUT 2ND TO 3RD IT SHIFTS AT ABOUT 2800 TO 3000 RPM ALSO WHEN GOING 55 OR 65 IT SHIFTS IN AND OUT OF OVERDRIVE IS THIS A PROBLEM G.M. HAD WITH THIS TRANNIE I SEE A LOT OF POSTING WITH THE SAME TROUBLE.
Re: 4l80e shift problems	zachery wesly turner	11-21-07
Trans worked perfect until changed injection pump, now its inlimp mode,
Re: 4l80e shift problems	rod cosner	11-25-07
I have a 92 2500 chevy silverado 4 wheel drive with the 4l80e tranny. trans has started shifting very hard, especially from low to second. also shifts hard from park into reverse. thanks for any help
Re: 4l80e shift problems	Greg	12-12-07
I have a 93 gm 1 ton with 130,000 km with a 4L80e tran. that was re build 5 months ago, i am having the same problem as befor it was re built, I oly have 1st, 2nd and R. i'm no sure if i trust the shop that i took it to because no they want to charge me anothere $300.00 saying that it's the tran. computer. is there a separate computer for the engine and the tran.?
Re: 4l80e shift problems	STAN STEIER	10-3-05
I HAVE A 1993 CHEV 3500DUALLY 6.5TD. OVER THE LAST MONTH OR SO MY SPEEDOMETER HAS NEEN ACTING KIND OF FUNNY. WHEN I DRIVE ON THE HIGHWAY IT BOUNCES FROM 100-140 KM'S. IT ALSO BOUNCES WHEN YOU PUT THE TRUCK INTO GEAR. THIS PAST SATURDAY I WENT FOR A DRIVE, WHEN IT SUDDENLY FELT LIKE I HAD SHIFTED INTO NEUTRAL FOR A COUPLE OF SECONDS AND THEN DROVE LIKE NORMAL FOR AWHILE. IT DID THIS UNTIL THE TRUCK WAS REALLY WARMED UP. I HAD A MECHANIC TAKE IT FOR A TEST DRIVE AND HE FIGURED IT COULD BE THE ELECTRONICS. WE CLEANED THE ELECTRICAL CONNECTIONS AS WELL. WHEN IT WAS LET SIT FOR ABOUT AN HOUR IT REPEATED THE PROBLEM. WHAT ADVICE CAN YOU GIVE ME. THANX STAN
Re: 4l80e shift problems	Corey	8-2-07
I have a 94 suburban 2500 with a brand new tranny that wont shift. I get codes 85 and 87 when I scan it. Would this be the input speed sensor causing my problem
Re: 4l80e	hugo de leon	12-28-07
93 chevy 6.5 t d 4l80e trans wont shift into overdrive what could be causing the problem.thanks
Re: 4l80e shift problems	N William Snyder	12-13-07
We seem to be having asimilar problem with our service vehicle. The speedometer goes erratic the transmission starts shifting to the gear that identifies with that speed. Also the ABS light comes on. Terrible for ride and fuel mileage.
Re: 4l80e	Christian	6-14-08
I have a 4L80e in my Impala. With a TCI controler. The problem is that it starts in 2 (unless i manuely put it i 1) an than it shifts to 3 and go in to lock up. I have changede the A&B solonoides (and theck the old ones workede fine) and theckede the valves behind them work smoot. Triede another ECU same thing. changede the wiring in the trans. theckede the outside wiring and is ok. The trans is a pro rebuild (AMT) with a Yank converter. It has all the upgrades it can have. and workede fine when i put it on the car. And drove 40 miles. than it sat of a year. Any idears???