Specifications. The 6L80 denotes that the transmission is a 6-Speed, Longitudinally mounted, and for 8000 lbs. vehicle weights. It's RPO code is "MYC" and it is domestically manufactured in GM's Ypsilanti, Michigan plant. Newer to the transmission world is its use of direct clutch-to-clutch shifting and the total lack of bands.
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Dec 1, 2015. Messages: 78. Occupation: Mechanic. Location: Chicago. Looking for a pressure test procedure along with a hydraulic schematic. Dropped the pan, oil was clean, governor seems good, modulator linkage and actuation seems good, shifts late into second and will not shift into fifth, all shift points erratic. Check the O-ring within the speed sensor or the oil seal to determine the sources of leaking. 4. The car is not getting into gear In case the transmission is not getting into gear, check the shift linkage bushing to see if it needs a few adjustments or has damage or looseness. The clutch may also cause the failure to get the transmission into gear.
Modern Allison Transmissions come with a limp mode installed. This is a different shift table that allows the transmission to protect itself from catastrophic failure. You should.
to the clutches when the valve is operating. This can result in transmission failure. Typical shift linkage adjustment complaints: 1. Shift lever (in cab) does not line up with the gear selected. 2. Slow engagement to forward or reverse. 3. Truck creeps forward or backward in neutral. 4. Reverse beeper operates intermittently in reverse or in.
You’ll go down the highway and the engine rpm will be higher and it feels almost as if the transmission is over reacting to what you are telling the gas pedal. This is usually caused by the lockup circuit failing. There’s a switch under the brake pedal that works like a brake light switch that tells this circuit when it’s time to activate.
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I noticed a leak from the Allison trans after I pulled my 7000 lb trailer up a long grade on a 90 degree day. The trans gauge went up to about 190 degrees. I lost about a quarter of a quart of fluid. It looks like the fluid is coming from an area on the trans where the shift linkage goes into the trans (thats my guess).
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Most complaints are with remote type linkages used in cabover-engine vehicles. Before checking the transmission for hard shifting the remote linkage should be inspected. Linkage problems.
If the vehicle has been sitting, it will have a much thicker texture. If you want to check your transmission fluid via the dipstick, it's best that you warm up the engine first. 2. Trouble Changing Gears. If there seems to be an issue changing gears, there could be too much fluid in the system.
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The torque converter is a fluid turbine drive and like those on its predecessor transmissions; the TH350C, 700R4, and 4L60, the 4L80 features a lock-up pressure plate for direct mechanically coupled driving from the engine crank. The 4L80 features a 310 mm torque converter. As to length, this transmission is 26-1/4" long.
start the engine & put into reverse, most of the time it will go into reverse for a few feet or not at all then put it in d & it will go klunk, like it is in 2nd gear but will not shift right. put back in p, turn key off & restart engine 5-15 times until it goes into reverse normally, then you can shift into any gear or back into reverse drive it.
Answer: Usually, when a transmission pops out of gear it's because a shift fork is bent inside the transmission. The shift fork is what moves the synchro up and down the gear, and if it becomes bent for whatever reason, it will slip out of gear. Question: While accelerating, my manual transmission seems to slip.
It takes some practice and usualy requires about 5 ruined seals before you get one to seal. I had even asked transmission shops about it to which I only received vague “Oh, that might take.
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63. Fullerton CA. Oct 6, 2011. #6. BlkMax said: The Allison does not seal the output shaft, the seal to stop oil migration between the Alli and the transfer case is on the front input.
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