When was the General Motors 4L80E transmission made?

The 4L80E transmission was produced in October 1963 by General motors for longitudinal engine configurations. This transmission is a revamped version of the Turbo-Hydramatic TH400, which is why it does not come as a surprise that it features most of the internal components of the TH 400.

Where is the speed sensor on a 1991 4L80E?

For instance, 1991 – 1996 4L80E’s have a speed sensor that is located at the driver’s side rear portion of the case. On the other hand, the 1997 and later 4wd applications may lack the rear sensor.

What’s the difference between TH400 and 4L80E transmission?

The transmission uses electronics to control shift points. The 4L80E transmission is 4 inches longer than the TH400. The rear tailhousing bolt indexing bore diameter was changed on the 4L80E.

What causes transmission fluid to overheat in 4L80E?

Overheating: Transmission fluid helps to remove heat generated from the moving internal components in the transmission. On the other hand, if a heavy load is hauled or towed and the radiator cooler can’t cool the ATF properly, it could lead to overheating of the 4L80E.

Is the 4L80E transmission a good or bad transmission?

But while the 4L80E is a strong, heavy-duty transmission, during the first few years of production the 4L80E was not as durable as its design permitted due mainly to faulty parts. As such, most of the 1991-1992 454SS trucks came with 4L80E transmissions that had faulty parts from the factory.

What does PWM solenoid do on 4L80E transmission?

On the other hand, a PWM lockup solenoid controls the 4L80E torque converter (in factory mode), and it helps to provide a smooth lockup execution. Two-speed sensors can be found on the 4L80E transmission, and these sensors serve as a turbine input speed and output speed, respectively.

Is the TH-400 4L80E a race car?

The 4L80E is being found in more and more high performance, race, and tow vehicles over the last few years. And it’s no secret why. The 4L80E, an electronic, overdrive-equipped version of the venerable TH-400, is tough enough to handle just about whatever hell you put it through when built properly.

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.

How much torque does a GMC 4L80E transmission have?

Also, the 4L80E performance transmission was designed for cars up to 16,500 lbs GVWR with towing capacity up to 22,000 LBS, and whose engine is up to 440 ft. lbs. (597 N·m) of torque. Some cars that used the 4L80E transmission include Chevrolet/GMC pickups, commercial vehicles, and vans.

What does the E mean on a 4L80E transmission?

The ‘E’ means it requires an Electronic Control Unit (ECU) for control and firmness to enable its functionality. Also, the 4L80E performance transmission was designed for cars up to 16,500 lbs GVWR with towing capacity up to 22,000 LBS, and whose engine is up to 440 ft. lbs. (597 N·m) of torque.

When did the GMC 4L85 transmission come out?

The 4L85 transmission was introduced in 2002. Some of the differences included a 5-pinion output gearset and 5-pinion reaction gearset. Though not a transmission development change, in 2006 GM specified a new transmission fluid formulation and required its use (for warranty) in the 4L80 series.

What’s the difference between GM 4L80 and 4L85?

Readers may also note that the 4L80 and 4L85 terms are sometimes used without the “E” suffix, as all GM automatics are now electronically controlled and therefore in no need of differentiation. The 4L80 nomenclature denotes that the transmission is a 4-Speed, Longitudinally mounted, and for 8000 lbs. vehicle weights.