Can a GMC 4L80E be used as a Transmission Control Module?

Some years ago I developed a method of converting a 4L80E to full manual any 4L80E transmission to full manual control, eliminating the need for a PCM. As already stated this is for the 4L80E GM transmission WITH THE A TPS INPUT in order to function correctly as a transmission control module.

How much torque does a 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. It was also adopted in Rolls Royce and Bentley vehicles.

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.

When did the Chevy 4L80E transmission come out?

Unlike the later 4L60E transmission, the 4L80E did not feature a removable bellhousing, but an integrated bellhousing with only the Chevrolet 90 degree engine bolt pattern being available. In 1991 the 4L80E was rolled out in GM trucks, including the Sierra, Silverado, Suburban, etc. as well as the Hummer H1.

What kind of torque converter does GM 4L80 have?

The torque converter is a fluid turbine drive and like those on its predecessor transmissions; the TH350C, 700R4, and 4L60, the 4L80 features a lock-up pressure plate for direct mechanically coupled driving from the engine crank. The 4L80 features a 310 mm torque converter. As to length, this transmission is 26-1/4″ long.

What kind of case does a GM 4L80E have?

Like the other GM automatics, the 4L80E featured a die-cast aluminum case. Unlike the later 4L60E transmission, the 4L80E did not feature a removable bellhousing, but an integrated bellhousing with only the Chevrolet 90 degree engine bolt pattern being available.

Do you need a transmission controller for a GM 4L80?

Engine Compatibility While the 4L80 is generally mechanically compatible with Chevrolet style GM engines, it does require a transmission controller. That controller may be the factory-integrated with the PCM as on 1991-1999 TBI & Gen II engines, with the 1999-2007 Gen III engines, or the 2007+ Gen IV engines.

What causes shift feel in 4L80E transmission?

Inconsistent shift feel, Shift solenoid filter blow-out, and Premature unit failure A complete pressure regulator valve train is supplied in the 4L80-E kit. This corrects Fail-safe, runaway high pressure that will crack the case if not corrected.

Is the GM 700R4 a heavy duty transmission?

The 700R4 was a pretty tough transmission, but not quite in the class of the TH400. GM needed a heavy-duty automatic overdrive. GM used as many TH400 parts and designs as possible in the 4L80E, but the added overdrive gear would require an extra gearset and slightly longer (~1-1/2″) case.

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 TH-400 4L80E a good transmission?

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. 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.

Are there any transmission problems with a 454SS?

As such, most of the 1991-1992 454SS trucks came with 4L80E transmissions that had faulty parts from the factory. Most of the problems are electronic in nature and are relatively easy, but expensive, to fix. This article deals with fixing your factory 4L80E to make it as durable and reliable as it should have come from the factory.

Why is my 4L80E transmission not locking up?

Common 4L80E Problems. Torque Converter Not Locking Up: The torque converter on most modern automatic transmissions is made to lock up in order to allow for a physical connection between the engine and the rest of the drivetrain. This is achieved by placing a clutch in the torque converter that locks out the hydraulic torque multiplication …

What’s the problem with the 4L80-E no overdrive?

The most common problem facing the 4L80-E NO OVERDRIVE and how to deal with it. Not open for further replies. If the problem is electrical then chances are you can troubleshoot the problem yourself. The torque converter has a torque converter clutch. It is this clutch that provides the mechanical coupling from the engine to the transmission.

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.

Is the 4L80E transmission on my Silverado overheating?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. I was wondering if anyone has had this problem with there 4L80e transmissions. On my truck the transmission overheats when driving with no load on rather mild days (75 degrees F).

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