4L60E Pump 1995-1996

Mid-90s GM trucks and cars with the 4L60E, from the 1995-1996 C/K 1500, Tahoe, Yukon and Suburban to the S-10, Blazer, Camaro, Firebird, Corvette and Impala SS, are now old enough that front pump wear is routine. When yours hesitates before engaging, slips under load, or starts setting converter clutch codes, a remanufactured 4L60E pump built for the 1995-1996 design is a direct fix. It is a complete assembly with a 1-year warranty.

What the pump does in a 1995-1996 4L60E

The pump is a variable-displacement vane design: the converter hub spins a rotor and vanes inside a slide, and the pressure regulator valve moves the slide on its pivot pin to hold the line pressure the computer asks for. It also routes oil to fill the converter and apply the converter clutch, and that is where 1995 becomes a dividing line.

For 1995 GM added a pulse-width modulated converter clutch solenoid that works alongside the original on/off solenoid, so the clutch could be applied smoothly instead of slammed on. The converter clutch apply circuit in the pump and valve body was built to suit that control. A pump with a worn regulator bore, a sticking converter clutch valve or a loose stator bushing cannot hold steady apply pressure, and the PWM strategy cannot compensate for oil that leaks away.

Symptoms of a failing 1995-1996 pump

• Hesitation going into drive or reverse, especially after a long drive
• General slipping in every range, with high RPM and slow acceleration
• Pump whine that tracks engine speed regardless of gear
• Converter clutch slip, shudder or no lockup, often with P1870 stored on these years
• A burnt 3-4 clutch pack, the failure low line pressure feeds on every 4L60E

How to confirm it before you buy

A pressure gauge on the line tap tells you more than any scan tool. Low pressure at idle in every range points at worn pump elements; low pressure only in reverse or at heavy throttle points at the regulator and boost valve. If the complaint is only converter slip, rule out the valve body and solenoids too; Sonnax notes P1870 has been GM's converter slip code on the 4L60E since 1995. Our 4L60E pump wear guide explains each wear point, and the 4L60E overrun clutch guide helps separate pump trouble from clutch trouble.

Fitment

This pump is listed for 1995-1996 4L60E transmissions. These two years share the PWM converter clutch layout. In 1996 GM switched the 3-2 downshift solenoid from PWM to on/off, which is a valve body and electrical change rather than a pump change, but it is one more reason to keep the pump and valve body matched to the year. Do not install this pump in a 1993-94 unit without converting the converter clutch controls; that earlier design has its own 1992-94 4L60E pump. Compare the cover casting, hub bore and stator shaft against your old pump, or send your year and VIN for a check. More parts for your unit are in the 4L60E collection.

Install notes

• Inspect the converter hub and replace or resurface a grooved converter; it is the fastest way to ruin a new pump bushing and front seal.
• Install new pump seals and a front seal, and center the pump with a 4L60E front pump alignment band as you torque the bolts in a crisscross pattern.
• If the valve body is also suspect, a 4L60E solenoid and filter service kit handles the electrical side while the pan is off.
• Use Dexron VI ATF. Pre-fill the converter and fill the case before starting to prime the pump.
• Verify end play after torquing the pump, and flush the cooler and lines if the old pump shed metal.

Will this pump fit my 1996 Tahoe?

It is listed for 1995-1996 4L60E applications, which includes the 1996 Tahoe. Compare the cover casting and stator shaft with your old pump, or send us the VIN to confirm.

Can I put this pump in a 1993 or 1994 transmission?

Not as a simple swap. 1995 added a PWM converter clutch solenoid, and early and later converter clutch systems should not be mixed. Use the 1992-94 pump for early units.

Will a new pump clear my P1870 code?

It can if the pump's converter clutch circuit or stator bushing is leaking. P1870 can also come from valve body bore wear or a failing solenoid, so test those before replacing the pump.

What fluid does a 1995-1996 4L60E use?

Service it with Dexron VI ATF, which replaces the original Dexron III. Pre-fill the converter before installation.

Is this pump new or remanufactured?

It is a remanufactured OEM pump supplied as a complete assembly with a 1-year warranty.

• 4L60E Pump Rotor and Bushing Wear: Symptoms and Rebuild
• 4L60E Overrun Clutch: Function, Wear and Symptoms
• 4L60E Common Problems, Symptoms, and What to Actually Do About Them
• 4L60E 2-4 Band and Servo: Wear, Pin Selection and the Corvette Servo Upgrade