It may not be the torque converter, especially since you had yours re-built. I'll let you know the outcome. He said that if I had driven the truck too much with the speedometer unplugged, the higher pump pressure would have eventually grenaded the case--literally. This transmission, in comparison to its slightly lighter duty counterpart, the , has a smaller band of gear ratios. If battery voltage is not present at the fuse, test for continuity between the fuse and the ignition switch. It was also adopted by Rolls Royce in 1991 and modified after extensive testing, and used initially in the Bentley Continental R, and subsequently other Rolls Royce and Bentley vehicles. The idle voltage may be different for your particular application.
The truck was apparently driven a lot after the problem started I bought this truck used. I mean to say, when i shift in to R , i feel the klick and it seems it will go reverse but it not go,s. It's wintertime, and almost Christmas. I have not yet replaced the front sensor, but will be doing that in the morning. Take a look at it all there is some good info on all the different switches and modules that effect the shift pattern of the 4L80. So I've found a few posts here, and I have a detailed Idea of whats causing my no overdrive problem. Transmissions For Sale: Live Auction Listings.
But it actually does stay in overdrive like it should, once it goes there. Apparently 4L80e's have had a rep for more or less blowing up due to inadequate venting of excess pressures when they arise. While holding my test light on the trans fuse, I tapped on the ignition switch with my screwdriver handle, and got the light to flash a little, so the ignition switch is gonna get replaced, it's acting kinda goofy anyways. These solenoids are found on the front of the valve body and are easy to get to once you drop the oil pan. I just verified again in the Hydromatic book.
Or is it possible that my problem is caused by something else? Use your best judgement in these cases. If the battery voltage is not present at the fuse, replace the ignition switch. Here he shows us the forward clutch drum ring which is grooved due to a worn drum bushing. The 4L80 and 4L85 were built at in. Doesn't matter if your accelerating or coasting. I pulled out my trusty test light and found that my transmission fuse 20 had no power going to it.
I did obtain a front speed sensor supposedly there are two of these on the left side of the tranny, not counting the one on the transfer case, but I can only find one sensor actually mounted on the tranny. Trouble Shooting a Faulty Shift Solenoid In Your 4L80E Automatic Transmission Posted by on Wednesday, December 4th, 2013 The 4L80E is a four speed automatic transmission designed and built by General Motors. This would be a cost effective way of sourcing one, but it would most likely need to be rebuilt. But while the 4L80E is a strong, heavy-duty transmission, during the first few years of production the 4L80E was not as durable as its design permitted due mainly to faulty parts. On 4x4, the rear speed sensor is on the transfer case, on 2wd it's on the back part of the transmission.
. Remember to fill the converter with as much fluid as you can before you install it. Disassembly began by stripping down all the components and inspecting for wear and breakage. The difference between dismantlers and the local yard all come down to how vehicles are ingested and the organization structure in place. Attach the two leads coming off the ohm meter to the two wires on the solenoid. Another option is to search for a core at the local yard, or even better your local dismantler and spend hours finding one and pulling it out. They have to be spotless for a good reading.
Instead of buying a rebuild kit and hoping that we did everything right, we decided to call the Doctor. This lead to the washer breaking up into little pieces, which would jam the direct piston, thereby damaging it and the direct clutch. Are you having problems fixing a 4L80E transmission? The 22 years of usage is a testament to its robustness and strength. That includes the Suburban, Tahoe, and even the Avalanche. So what do I do next? There is a solenoid on the side of the transmission that may not be working, they have a tendency to wear out, that could be all it is, or simple as the wiring, the old wires sometimes can get loose or dirty and will send currents through the wires im not sure which wires, but ones that run from the computer to tranny somewhere, not much help i know as they touch or manage to make a connection if dirty.
The bolt that retains the sensor is 10mm. I figured just to test it out, I would power up the fuse and see if the transmission would run right. Problem started with it going into limp mode sticking in 2nd gear. They both have the same forward gear ratios, only the 4L80E gets the overdrive gear of course. My problem is that sometimes when I come to a complete stop, then go to take off the transmission feels like it slips in first gear. If tester lights continue with Regular Method.