Transmission want go in High gear. It goes from low too out of gear

There could be several issues that could cause your GMC Envoy's transmission to not shift gears properly and the RPMs to rev high. Here are a few potential problems that you may want to consider:

1. Low transmission fluid: If the transmission fluid is low, it could cause problems with the shifting mechanism. You'll want to check the transmission fluid level and add more if needed.
2. Faulty shift solenoid: The shift solenoid is responsible for directing transmission fluid to the appropriate gear. If the solenoid is faulty, it could cause shifting problems.
3. Worn transmission bands or gears: If the transmission bands or gears are worn, it could cause the transmission to not shift properly and the RPMs to rev high.
4. Clogged transmission filter: A clogged transmission filter can restrict the flow of transmission fluid, causing shifting issues.
5. Faulty transmission control module (TCM): The TCM is responsible for controlling the transmission. If it's not functioning properly, it could cause shifting problems.

I would recommend having a mechanic diagnose and fix the problem for you. It's important to address transmission issues promptly, as they can lead to further damage if left unchecked.

Torke converter needs to be replaced. Before you do that check the mounts.

It's not a rear end problem. It's a transmission problem. Check your transmission fluid level and condition. If it's low try adding fluid until its full and try driving. If that doesn't fix it take your car to a good transmission reapir shop.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/justin_3ae27a9d61d6acd4

Low transmisson fluid, Transmission filter or faulty transmission pump, the pump usually will whine before it goes out tho, Im leaning towards the filter or low fluid. Check your transmission control selonoid.

Transmission distance sensor ?????? P0707 Transmission Range Sensor A Circuit Low Input Transmission Control Module - AISIN Transmission REFER to Section 307-01B .
My problem is the RMP goes in high,???? RPM P0707 TR sensor TR sensor circuit low input TR sensor signal is below threshold of 0.127 volts, sensor/circuit electrical malfunction TR sensor indicates a stuck position (D-3rd gear), no adaptive or self learning strategy. Install a new TCM.
Your best bet ,take your vehicle to a ford dealer .

Popular Problems Checks
1. Car will not go into gear:

• Gear selector cable has failed
• Brake lock solenoid/brake light swtich has failed not allowing the gear selector to move out of "Park"
• Excessively low transmission fluid (note: if car is operated for an extended amount of time with low fluid level the transmission will fail prematurely)
• Shorted electrical component not allowing the PCM to control the transmission. Example: shorted fuse
• Flex plate (flywheel) is broken completely not transferring engine power to the transmission.

2. Car goes into gear but then fades out of gear or is slipping while driving:

• Transmission fluid is low
• Transmission clutch discs or bands are worn out or burned
• Faulty transmission shift solenoid.

3. Car goes into gear but does not shift out of first:

• Blown fuse to the PCM controller
• Faulty vehicle speed sensor (VSS)
• Shorted second gear control solenoid
• Faulty transmission controller (PCM)

that sounds more like engine pinking in high gear,low revs,propshaft vibrating in high gear low revs with the torque of the engine

problem is internal ,not difficult to repair ,its a solonoid on the mechanism inside the sump but you may not be able to buy the parts only an exchange gearbox complete

You will need to have your tranny rebuilt or get a replacement. As a mechanic myslef, I have seen this a few times in the Jag XJ series. Those people eneded up having tranny replaced as well.

your transmission is slipping that could be a couple different things it could be low on fluids or your transmission is going what if any noises does it make