dvanbramer88 wrote:My shifts have been firm for a while now, especially 1-2 with the truck cold. The other night, and twice yesterday the truck stalled because of the transmission. I have no codes. I took it to the local, very reputable transmission shop. The owner drove my truck around with the computer hooked up for about 40 minutes. (I was with him) Shifts were taking the normal .15 seconds' except 3-4. 3-4 was taking 6 seconds. I can feel a little shutter/bump as it drops into overdrive. My slop in the torque converter was -4rpms. Almost 100% lockup. The guy said the older 4L60e's didn't have slop built in, but the new ones did. So he says from the info from the computer that my clutch packs and TC are fine, especially because they aren't slipping. He says the balls on the check valve's wore out the plate (Like yours, and very common with our trans) causing the slop/hang up while shifting. He also expects to find a broken spring or valve that started causing the truck to stall when cold. He is selling me the Transgo shift kit for $80 and $200 labor (includes fluid and filter) He said that he may decide to change 2 $30 parts (pumps or something) while he's in there, which may also be causing the periodical stall. No extra labor. I brought up a tans temp gauge and he even offered to weld a bung in the pan for free. Does his diagnostics sound about right to you? I know you're not an expert.
How do you know the stall is being caused by the transmission?
By slop in the torque converter, I'm guessing he's talking about input vs output rpm sensor readings while locked up in 4th gear? Mine shows 1 rpm now when fully locked up in 4th, so I'm guessing that's what he was looking at.
I'm also guessing he was talking about changing out a relay valve or servo when he said he may change 2 parts.
I'm not familiar with stalls being caused by an auto transmission, but my only guess is that the TCC is trying to apply when not in 4th gear. I'm not sure what could cause that, not being too familiar with the trans fluid routes, but I'm guessing his logic is that a check valve is letting fluid bypass at the wrong time and engaging the TCC - which is essentially like letting out the clutch in a manual trans.