1996 Chevy S-10 2.2L I4, 79K miles Some of you might remember a while back, I posted about how the S-10 was badly misbehaving with overdrive. It would flutter in/out of lockup while going down the highway, and often times would generate massive TCC chatter when dropping out of lockup. I’ve rec…

The replacement transmissions that I installed for years came with a pressurized can of cooling system flush.

@rjcapy , the problem with your Corvette is not that the transmissions are bad. This is a labor issue in which the cooler should have been checked at the start. And if the cooler was clogged you have to assume that was due to debris and gunk from high mileage and/or lack of fluid changes. There’s a …

The early GM 700R4 was the worst transmissions ever made. The later ones were ok.

That’s not the best solution for cold climates. The “cooler” is really a temperature “regulator”. It uses the engine coolant to warm up the trans faster on those cold days…

We have lots of trucks with 4L60E and 4R70W transmissions in our fleet They’re not dropping like flies, so neither of them are “the worst transmission ever” IMO

I agree that may or may not have been why there was such a issue with this trans. but you would hope that a certified G.M. tech,-mech,-wouild have cleaned the cooler right off the start?

Yes, a decent mechanic (GM certs or not…) should have cleaned the cooler at the start.

Just curious, what does the 4L60E nomenclature mean? Like a Ford C4 means it was designed in 1964 I think. C6, 1966. Is there a similar meaning to the numbers and letters 4L60E?

4 forward gear ratios Longitudinal applications . . . transverse applications get a T, instead 60 is a number that’s SOMEWHAT indicative of the torque the transmission can handle. But it’s usefulness is limited. However, a 4L80E can handle more torque, it’s got a larger case, and is generally me…

4L60E - Worst transmission ever made?

Maintenance/Repairs

George_San_Jose1 February 24, 2017, 3:42am 23

The only problem I’ve heard about the 4L60E is that it isn’t overly difficult to mess up and install the wrong filter, b/c there are several filters available, but only one fits correctly, something like that. The specific comment as I recall was that it wasn’t uncommon for a shop to discover a customer’s 4L60E had the wrong filter installed when they opened it up for diagnosis, and that was causing drivability symptoms.

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4L60E - Worst transmission ever made?

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