Transmission problems... - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 04-20-2017, 02:18 PM
cbc_03 cbc_03 is offline
Junior Member
2005 GMC Envoy SLT XL
Graphite Metallic 4.2L I6 4X4
Join Date: Apr 2017
Location: NJ
Posts: 1
Transmission problems...

Hi guys, new here but not new to forums in general. I have a 2005 GMC Envoy SLT 4x4 with around 130k miles. Car has no CELs nor has it given any previous indication of impending transmission failure. Last week I took it for a quick drive to a nearby store (maybe 5 miles roundtrip). While I was getting ready to park at home, I heard a small popping noise that came from under the car. After this I lost all gears. The car only accelerates but will not move. I tried in reverse, drive, 1st and 2nd. The car will stay put in Park like normal, but once you shift out of Park, it's like every gear is in neutral. Right after this popping sound, I also noticed that the brake pedal now sinks all the way to the floor (not sure if this is a coincidence as I don't see how brakes and trans are related but thought it'd be good to mention as it happened at the same time).

After doing some research, I checked the shifter linkage as this appears to be a common problem. Linkage is intact and making shifts properly. More research led to me doing a transmission fluid change along with a new trans filter. I drained the fluid and immediately noticed the fluid abnormally thick and almost black along with some very fine metal shavings, nothing big or lumpy. I removed the pan, everything looked normal. Removed the filter. Began fitting new filter when I heard something fall inside the filter neck. I removed the new filter and checked and I found this small metal square. I have no idea where it came from and I cannot find where it belongs. I started to fit the filter back in again when another square dropped down. The second one looks exactly like the first and they appear to be magnetic as they stick to each other. I tried looking these pieces up but I can not find anything regarding these two squares. They 100% fell out from the transmission, that much I am sure. So my question is, can you guys identify these squares? Does this mean my trans is toast? Or could my issue be related to something else? (transfer case, diff, etc) Again, I have not noticed any indication of an oncoming failure nor are there any CELs present. This happened out of the blue. Any insight will be much appreciated! Thanks in advanced

**Attempted to post pics in thread but apparently i'm too new to post links.. these are small metal squares about an inch on all sides. I could maybe PM the pics...
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