GMC DRIVETRAIN

My 94 Gmc Dually Is Stuck In 4 High And 4 Low And Even Neutral But It Wont Go In To 2 High. Any Suggestions? Also If I Drive The Truck With...

The Actuator And The Four Button Dash Switch Was Replaced. When The Four High Button Is Pressed It Blinks Several Times Then Returns To The...

My 1997 Gmc Jimmy 4.3 Will Not Shift Back To 2-hi From 4-hi. It Has 3 Button Electrical Control.

The Transmission Was Shifted Into Reverse And Still Moved Forward. Afterwards The Vehicle Was Turned Off And Would Not Restart. Now It...

At The Same Time I Realized That My Spedometer Was Not Working, I Noticed My Transmission Was Not Shifting. I Can Only Travel About 15 Mph...

Yesterday I Drove Home (without Issues) A 96 Sierra 1500 (acquired From An Estate). No Problems. It Was Parked On The Street When I Got...

Out Of The Blue, While Slowing From 70 Mph, The Speedo Begins Bouncing Up And Down; The Transmission Then Seemed To Be "slipping" As I...

I Was Driving With No Issues. All Of A Sudden There Was This Whining Noise Coming From What I Thought Was Under The Hood, But I Think It&#...

Where Is The Tcm Located On My Vehicle Listed Above Xl Model? We Already Looked In Console An By The Battery, We Saw What It Looks Like But...

Okay Fine In Reverse, First And Second. Once Up Speed Can Go Into Third, But Cannot Start In Third. Fluid Level Fine. What Is Wrong? Can...