Transmission Parts GM 6L80 Valve Body Valve Body

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Warning:

GM and BMW 6L45 through 6L90 early- and late-style units cannot be interchanged but are very similar in appearance. Reference the Sonnax identification guide to verify the correct valve body is installed.

6L80

Remanufactured Valve Body
Part No. GM6L80L

’10-Later

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Sonnax remanufactured valve body GM6L80L has been designed to address common issues, such as: burnt clutches; codes P0751, P0741, P0742; harsh TCC apply; bump, harsh or flare shifts; bind-ups; solenoid performance codes; and wrong gear starts.

To guarantee the highest level of operational performance, this remanufactured valve body is tested on state-of-the art equipment to verify that actuator feed limit pressure, clutch pressures, torque converter pressures and compensator feed pressures match OE specification.

A TEHCM is not included with the valve body, but is available from Sonnax, OE and various aftermarket sources if required. A common fault with the TEHCM is failed pressure switches, which can be easily checked and repaired using Sonnax kits 124740-70K and 124740-TL70, if required.

Bores, plates, checkballs, seals, casting…every critical area is reviewed, refreshed and repaired
Top-quality Sonnax components optimize valve body function and prevent future wear
State-of-the-art testing verifies AFL, clutch, TC and compensator feed pressures match new OE specs

Note

Sold without the TEHCM.
The main pressure regulator valve lives in the pump for these transmissions. Shift, clutch and performance conditions that result from wear at the pressure regulator valve bore or associated boost valve cannot be corrected by replacing the valve body.
The TCC control and converter limit valve also live in the pump and wear could result in converter failure. These pump bores should be checked for wear while servicing the transmission, reference our vacuum test guide for test locations and suitable replacement parts, if required.

Related Tech

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Under Pressure: Shift Quality & Pressure Switches in TEHCM Applications

January 30, 2018

GM & BMW 6L80 Family Identification Guide

This identification guide covers GM 6L45, 6L50, 6L80 and 6L90 valve bodies, plus the BMW early- and late-style transmission separator plates.

6L45/50 Early-Style ('10-Earlier) Upper Casting

6L45/50 Late-Style ('10-Later) Upper Casting

6L80 Early-Style ('10-Earlier) Upper Casting
Note: 6L90 Early-style ('10-earlier) also have the exhaust slots like shown above.

6L90 Late-Style ('10-Later) Upper Casting

Look for machined-down boss (A, B, C or D) on the upper casting. Generally, if the A boss is machined down, this indicates an MYA/6L45 (see chart below). This identification system is not foolproof, as some valve bodies do not have any bosses machined down.

Machined-Down Boss on Upper Valve Body	Indicates Valve Body Unit*
"A" Boss ID	MYA/6L45
"B" Boss ID	MYB/6L50
"C" Boss ID	MYC/6L80
"D" Boss ID	MYD/6L90
*Note: This is a general rule to follow, but may not always be true. Sometimes no bosses are machined.

6L45-6L90 Early-Style ('10-Earlier) Lower Casting

6L45-6L90 Late-Style ('10-Later) Lower Casting

		Upper Casting Number		Center Support Feed Holes	Lower Casting Number
		'10-Earlier	'10-Later	Center Support Feed Holes	'10-Earlier	'10-Later
GM	6L45	9405	7114	Centered	9581	0945
	6L50	9405	7117	Centered	9581	0945
	6L80	9404	0955	Offset Front	9581	0945
	6L90	9404	0955	Offset Rear	9581	0945
BMW	6L45	1590		Centered	9581 or 6351

BMW Early Separator Plate

BMW Late Separator Plate

BMW early versus late applications have a separator plate variation in the converter circuit. At this time, there are no known year breaks or external identification features that can be provided.