Here's a new one for me. Today I just hit 340k miles on my 03 Envoy XL with 4.2 and thought that was the end of it. I haven't been having any transmission problems before today. Just drove 230 miles yesterday no problems at all.
While driving this morning at highway speed I thought I heard a different noise (very faint) I never remember hearing before. I couldn't tell if it was a whining, vibration or what but the truck was driving completely like normal. Once I got to much slower speeds in stop and go traffic, that's where it all went downhill. The noise I was hearing from inside the truck was almost like the noise of a bad fan clutch but not as loud. I also started to notice the transmission seemed like it was slipping. Since I use this truck for work and I was 1 1/2 hours from home, I planned to continue on my day and try to baby it.
I had 5 jobs to go to and each time I left one job and headed for the next, everything seemed fine. Transmission wasn't slipping and the noise was gone. About 10-15 minutes into the drive between locations, the symptoms would return. After my last stop, I had a 1hr 20min ride (60 mile) to get back home. I was pretty close to the highway and was able to get gong at highway speed before any symptoms returned. The entire ride at highway speed was uneventful.
I thought the symptoms were going away because the truck was cooling off for 30 minutes each time at each job. When I got home I pulled directly into my driveway (which is a small incline) and checked the fluids in case that was the problem. The trans fluid looked a little low so I went to pick some up. When I pulled out of the driveway, I had no reverse and it would barely go into first gear. I did all of this while never shutting the truck off after my ride home. I parked it in the street and figured I would let it cool off again before heading out. 20 minutes later it started up and drove fine again. After 10 minutes of driving, the symptoms returned. At the store, I topped of the trans fluid but again after 10 minutes, the symptoms returned.
When I got home, I listened under the truck while revving the engine and it sounds like something rattling (internally). I can't pinpoint where the noise is coming from. I thought to myself, this is finally the end but I tried shutting the truck of and restarting it right away and the noise was gone and I also took it for a quick ride around the block and didn't have any issue. So I'm thinking the symptoms weren't going away because the truck was cooling down. It was just a matter that the truck was shut off and the symptoms went away.
Sorry for the long story...Now's the big question. Do you guys think the tranny is toast? If so, why are the symptoms going away. If it's not a toasted tranny, then what Does anyone have an idea what's causing it?
Thanks
While driving this morning at highway speed I thought I heard a different noise (very faint) I never remember hearing before. I couldn't tell if it was a whining, vibration or what but the truck was driving completely like normal. Once I got to much slower speeds in stop and go traffic, that's where it all went downhill. The noise I was hearing from inside the truck was almost like the noise of a bad fan clutch but not as loud. I also started to notice the transmission seemed like it was slipping. Since I use this truck for work and I was 1 1/2 hours from home, I planned to continue on my day and try to baby it.
I had 5 jobs to go to and each time I left one job and headed for the next, everything seemed fine. Transmission wasn't slipping and the noise was gone. About 10-15 minutes into the drive between locations, the symptoms would return. After my last stop, I had a 1hr 20min ride (60 mile) to get back home. I was pretty close to the highway and was able to get gong at highway speed before any symptoms returned. The entire ride at highway speed was uneventful.
I thought the symptoms were going away because the truck was cooling off for 30 minutes each time at each job. When I got home I pulled directly into my driveway (which is a small incline) and checked the fluids in case that was the problem. The trans fluid looked a little low so I went to pick some up. When I pulled out of the driveway, I had no reverse and it would barely go into first gear. I did all of this while never shutting the truck off after my ride home. I parked it in the street and figured I would let it cool off again before heading out. 20 minutes later it started up and drove fine again. After 10 minutes of driving, the symptoms returned. At the store, I topped of the trans fluid but again after 10 minutes, the symptoms returned.
When I got home, I listened under the truck while revving the engine and it sounds like something rattling (internally). I can't pinpoint where the noise is coming from. I thought to myself, this is finally the end but I tried shutting the truck of and restarting it right away and the noise was gone and I also took it for a quick ride around the block and didn't have any issue. So I'm thinking the symptoms weren't going away because the truck was cooling down. It was just a matter that the truck was shut off and the symptoms went away.
Sorry for the long story...Now's the big question. Do you guys think the tranny is toast? If so, why are the symptoms going away. If it's not a toasted tranny, then what Does anyone have an idea what's causing it?
Thanks