So I bought a 08 silverado recently, don't want to get into the story......Anyways, I personally think the vehicle was overheated shortly before I got it. Let's put that aside for min and go off what I know for sure.
The trans was rebuilt about 49k ago, shop that did it says it was stamped on there (so previous owner was truthful about that).
Fluid was not changed as of yet. Looks red, but imo smells a touch burnt.
Fluid was maybe 3/4 quart low when I got it.
When warms up to about 150 or so, it starts the problem and progressively gets worse as it warms further to about 175 (far as I warm it typically).
Problem is when stopped, or put into D, or even 1, it will hang n float, like it's not fully engaged into first gear, then I tap the gas a bit, and it drops into gear w a bit of a thud (if Ilet it do it by itself, it eventually will, sometimes you'll feel the engagement fully, almost like it was just shifted into D). All other gears work fine, including starting in 2nd, or R, no float n thud. 4th is fine as well.
Now the shop is pretty damn good, used them in the past and they have a great rep here, but they thought the problem was the engine mount at first (although I knew better), so I replaced the D side mount n trans mount, and of course problem stayed the same. After that they of course said yeah, trans issue. They looked into it, got back to me from transgo's advice, and said that it could be one of the shift solenoids doing that (no codes if wondering). The guy's been doing this for about 35 years and really seemed stumped by the issue and how it felt to him, I thought it was pretty obvious, but whatever. I don't think the solenoid will do much of anything, but I don't see why not to change it, cheap enough.
Anyone have any further advice on this? Maybe not just an a-b solenoid, possibly the 3-2, or Torque Converter solenoid or pressure control solenoid? Thus far I've bought a couple gm a-b shift solenoids, some delco trans fluid and mt-10 additive (which I will add 2nd, if the solenoids don't do anything).
The trans was rebuilt about 49k ago, shop that did it says it was stamped on there (so previous owner was truthful about that).
Fluid was not changed as of yet. Looks red, but imo smells a touch burnt.
Fluid was maybe 3/4 quart low when I got it.
When warms up to about 150 or so, it starts the problem and progressively gets worse as it warms further to about 175 (far as I warm it typically).
Problem is when stopped, or put into D, or even 1, it will hang n float, like it's not fully engaged into first gear, then I tap the gas a bit, and it drops into gear w a bit of a thud (if Ilet it do it by itself, it eventually will, sometimes you'll feel the engagement fully, almost like it was just shifted into D). All other gears work fine, including starting in 2nd, or R, no float n thud. 4th is fine as well.
Now the shop is pretty damn good, used them in the past and they have a great rep here, but they thought the problem was the engine mount at first (although I knew better), so I replaced the D side mount n trans mount, and of course problem stayed the same. After that they of course said yeah, trans issue. They looked into it, got back to me from transgo's advice, and said that it could be one of the shift solenoids doing that (no codes if wondering). The guy's been doing this for about 35 years and really seemed stumped by the issue and how it felt to him, I thought it was pretty obvious, but whatever. I don't think the solenoid will do much of anything, but I don't see why not to change it, cheap enough.
Anyone have any further advice on this? Maybe not just an a-b solenoid, possibly the 3-2, or Torque Converter solenoid or pressure control solenoid? Thus far I've bought a couple gm a-b shift solenoids, some delco trans fluid and mt-10 additive (which I will add 2nd, if the solenoids don't do anything).