GM 4L60E Archives - Transmission Digest
American Powertrain adds GearStar automatic transmissions for Ford, Chevy, Mopar

American Powertrain announced that it has added GearStar automatic transmissions for Ford, Chevy, and Mopar. Transmissions include the 4L60E for SBC, BBC and early LT engines; the 4L65E for LS and late LT engines; SB and BB Mopar and Gen III engines; the 4L80E for LS engines; and late model LTs and the 4R70W for Ford small block engines.  Each GearStar

Sonnax introduces input housing forward sleeve kit for GM 4L series

Sonnax has introduced a new input housing forward sleeve kit (part no. 77733-52K), which the company says can increase input housing torque capacity and maintain OE forward piston apply area in GM 4L60, 4L60-E, 4L65-E and 4L70-E transmissions. Sonnax suggests using it combination with a Sonnax overrun sleeve to greatly increase the maximum strength of

Diagnosing an unusual problem: A slow-to-respond solenoid

A 2001 Chevrolet S-10 pickup came into our shop the other day. This job started with a concern of the engine revving high and not shifting correctly. With the truck being equipped with a 4L60E transmission, I expected to find non-functioning third and fourth gears, which is a common failure for these transmissions. I scanned

An accidental solution: When an issue resolves itself, but you don’t know why

Today I found myself working on a 2008 Chevy Silverado with a 4L60E transmission that wasn’t shifting correctly and whose speedometer was jumping around. After a short drive I was able to confirm the customer’s concern that the transmission had an erratic shift. I have seen faulty alternators that cause erratic speedometers, so I did

Sonnax introduces 4L60-E, 4L65-E heavy-duty remanufactured valve bodies

Sonnax highlights its heavy-duty remanufactured valve bodies for ’96–’08 GM 4L60-E/65-E transmissions. Two part numbers are offered: GM053-HD, which the company says offers improved sprag/clutch durability in D3 first and second gears; or GM054-HD (pictured above), which adds overrun clutch control to those gears plus D4 first, second and third, the company says.

It’s the little things: Double-checking and doing the basics in transmission repair

As transmission technicians, problem-solving is what we do. We see that box that says “customer states” and we already have an idea of what is wrong, and 99% of the time we’re right. After all, it’s the eighth 6L80 we have seen this month. But with an endless list of components and ever-evolving technologies it

Fixing 4L60-E 1-2 shift issues

The complaint A 1993 Chevrolet 1500 with the 5.0-liter engine and 4L60E transmission has a complaint of second gear starts. The truck seemed to start off in first gear on an initial cold start but would stay in second gear at a stop or even when shifted out of Drive to Park or Reverse and