This is in regard to a Chevrolet Silverado 1500 with the 4.8L engine, 2WD, automatic.
It has 209287 miles on it.
I have owned this truck since February, however it has spent the past 3 months in my front yard with the front end raised up on spare rims so that I could work on it. During this time, I did a number of repairs and preventative maintenance, including replacing the transmission fluid and filter. I replaced the actual transmission pan itself, too, because the drain plug was completely rounded.
When I removed the transmission pan and drained the fluid, it did not look burned or dirty, however the filter had never been changed based on the date code, and how dirty it was. Also, I got out more than 2 gallons of transmission fluid, however adding only 5 quarts (the recommended amount for a drain-and-fill) was enough to make the dipstick read “full: cold” with the engine idling in “P”.
Today, I lowered the front of the truck down onto the ground, with the intention of going to buy new tires. Unfortunately, it will not engage in reverse, even though it did before I worked on it. I remember having to slightly bend the bracket which holds the shift cable in order to get the pan off, in addition to taking the exhaust pipe apart, however I bent the bracket back to what it should be.
I have looked online for information about this problem, and people talk about a “sun shell” in the transmission that can break, but I can’t imagine that this would have happened while the truck was parked in front of my house, not being driven.
Any ideas, besides taking it to a transmission shop, most of whom only want to sell a whole new transmission?