Can a 4L80E truck shift to overdrive?

In OD, truck shifts smooth through First, second and third, just wont shift to overdrive. Fluid is clean, no metal shavings, no burnt appearance or smell. To be quite honest, the trans looks great inside the pan. The trans shop guy said the transmission was rebuild a few years ago, which is good, trucks got 208k on her.

Why did I lose overdrive on my truck?

The trans shop guy said the transmission was rebuild a few years ago, which is good, trucks got 208k on her. However, hes trying to tell me the trans needs a full rebuild, but he also tells me losing overdrive has nothing to do with the TCC solenoid period, he swears its a hard part, but.

When did GM start using the 4L80E in trucks?

GM started using the 80E in 91 on the 3/4 and one ton trucks. Before that was the good ole TH400. 93 was the first year for the 4L60E. Sounds very doubtful that it is a major internal hard part.

What causes OD on a 4L80 diesel?

Since your transmission has 200Ks on it the problem is likely that the valve sleeve bore has worn. When the Torque converter Solenoid strokes the piston the transmission fluid leaks past when hot. The hydraulic signal get so weak that it will no longer activate the control valve within the pump thus kicking in OD.

Why does my 4L80E not go into reverse?

This seems to be a fairly common failure point on the 4L80E. IMO whats happening is either that the band anchor point breaks or the band anchor bolt breaks. If it just all of the sudden won’t go into reverse I highly doubt its because the band has worn or stretched and will no longer hold.

GM started using the 80E in 91 on the 3/4 and one ton trucks. Before that was the good ole TH400. 93 was the first year for the 4L60E. Sounds very doubtful that it is a major internal hard part.

What to do if your 4L80E is stuck in 2 from 3?

P-R-N-D work, upshifts mostly work, no downshift into 1 from 2 or to 2 from 3, “stuck” in a certain gear: Pull out the wallet and grease pan. You have to replace the solenoids that control the 1-2 and 2-3 shifts, the “A” and “B” solenoids respectively (the 3-OD shift is not controlled via a solenoid…more on that later).

Why is the shifting valve on my 4L80 not working?

The fluid is blocked at the screen and cannot pass through the screen when the shifting solenoid is engaged. When the electricity is shut off at the computer then the check ball is allowed to back off. When this happens then the shifting valve returns. No electricity sent means no gear.

Are there any problems with my 4L80E engine?

The following is a list of problems and possible solutions, should your 4L80E suddenly start to give you trouble. P-R-N-D work, upshifts are erratic and occur at random engine speeds, will not upshift from first gear (no upshifts at all): This problem seems very serious in nature but in fact this is something very simple to fix.

Is the direct clutch working on the 4L80-E?

(Remember, keep the pressure gauge on the outside of the vehicle if it is a mechanical gauge. This will prevent oil ending up inside the car if there happens to be a leak from the gauge or hose). 3rd and 4th gear are present: we know the direct clutch is capable of working and is good.

Where is the Transmission Control Module on a 4L80E?

The 4L80E Transmission system is equipped with a computer called the Transmission Control Module (TCM), located in the left/rear passenger seat compartment which interprets, ana-lyzes and records electronic signals from sensors and switches located on the engine, brake pedal, and transmission.

What kind of sub is a 4L80E diesel?

I’m not sure you’ve got a 4l80e, most Subs had 4l60e. If it’s a diesel you might, but just make certain what it is before you order anything. I deff have a 4L80E. Its a 93 Suburban 4×4 8 lug 2500.

Is there a truck that wont shift to overdrive?

How is drive fluid changed in a GMC 3500?

Drive fluid pressure from the manual valve is changed into 2-3 drive fluid pressure at the 1-2 shift valve, this pressure is directed to the 2-3 shift valve, Pulse Width Motor (PWM) solenoid and the intermediate (second) clutch.

When does a GMC 3500 shift into fourth gear?

During the fourth clutch piston stroke, the transmission shifts into fourth gear. – Third Clutch Accumulator: 3RD CL fluid pressure is also applied to the third clutch accumulator which is encased in the accumulator housing.