I have been posting on as many post as possible regarding transmission 4T65E GM. I hope this helps in the understanding of what is involved to make in car repairs, for specific vehicle information I would recommend contacting a local shop or finding a repair manual for your vehicle. Even if everything comes apart smooth you can run into other problems along the way or find more problems than originally sought out. Though an experienced trans shop or a tech can do this in roughly 4-8 hours I would plan a full day or two worth of down time. This is something that can be done with patience and the right tools and a good mechanical aptitude. This is a very labor intensive job and a $50 solenoid can quickly turn into a $500-$1000 job depending on vehicle and shop labor rate, so even though it is hard to gulp a quote that you recieved from a shop it is certainly expected once you know why it is so much and the labor needed to do the repair. Once the side cover is off you will have full access to inspect / replace the solenoids, pressure switch manifold, and pump/valve body assembly if needed. You will also need to remove the drivers side axle, unless you plan to just leave it hang from the axle but often there is not enough room to do this because of suspension components. Often times you can reuse the side covert gasket, but if it is damaged you will need to replace this item and it is a dealer only part that is pretty costly, so be careful with the original! Before you remove the side cover you will need to drain the transmission fluid. You have to remove the side cover of the transmission to gain access to the solenoids and valve body. You also may be required to completely remove the transmission from the vehicle while most you should be able to use your engine support and lower it down enough to remove the side cover of the transmission. On some vehicles you must remove the cradle complete out from the vehicle while some you can just remove a section of the support cradle. You will need to have some sort of engine support device as the engine must be held up because you will be dropping down or removing the support cradle under the front of the vehicle which contains engine and transmission mounts that support the drivetrain. Every different vehicle line is arranged different so I cannot provied information that is specific to all models. In order to gain access to the solenoids and / or the valve body you must lower the transmission out the bottom of the vehicle. How hard is it or is it something I can do in my garage? The answer will vary depending on mechainical skills and your tool supply! Because this is a front wheel drive transmission and the arrangement of the internals you CANNOT simply drop the bottom pan and access any of the solenoids or the valve body. Here's a quote from this 4T65E transmission site.
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