This is a 1997 GMC Yukon with a 5.7L and 4L60E with 168K. I bought in August from the original owner. I've drained and refilled fluid a couple of times and it looks pretty good. Based on what the seller told me, the vehicle has never towed more than a light pop-up camper. It had a service around 150K but otherwise had been left alone.
Overall, it shifts pretty well. But under anything besides light throttle, it can have a fairly rough shift in 1-2 and 2-3. I can make it shift perfectly smooth if I back off the gas pedal just before it shifts. It's also more noticeable up any sort of incline. And it's not big buck or jerk, but if you pay attention to such things, you definitely can feel it.
I have the same issue, though somewhat less pronounced, on a 2008 Suburban with the same transmission. A new throttle position sensor, shift solenoids and Lubegard didn't solve it in the Suburban and I've basically learned to modify my driving by feathering the throttle so it doesn't bug me as much.
I've researched the heck out of this but can't find anything that describes exactly what I'm dealing with. The fact that it does basically the same thing on two vehicles makes me wonder if it's just a characteristic of the 4L60E.
Overall, it shifts pretty well. But under anything besides light throttle, it can have a fairly rough shift in 1-2 and 2-3. I can make it shift perfectly smooth if I back off the gas pedal just before it shifts. It's also more noticeable up any sort of incline. And it's not big buck or jerk, but if you pay attention to such things, you definitely can feel it.
I have the same issue, though somewhat less pronounced, on a 2008 Suburban with the same transmission. A new throttle position sensor, shift solenoids and Lubegard didn't solve it in the Suburban and I've basically learned to modify my driving by feathering the throttle so it doesn't bug me as much.
I've researched the heck out of this but can't find anything that describes exactly what I'm dealing with. The fact that it does basically the same thing on two vehicles makes me wonder if it's just a characteristic of the 4L60E.