No second gear in my 4l60e
And you can also check the 2nd servo on the side of the trans.
The 2nd servo can be taken out but it can be hard to get to. It's easier to put a jack under the trans, remove the 4 cross member bolts, and lower it a little.
Last time I did this I still had to take it out in pieces, removing the E-clip and apply pin seperate.
It's not very common that the 2nd servo just fails.
It could also be a check ball blown through the seperator plate.
Did second ever shift real hard for a period of time before this problem?
Is the trans 100% stock?
If it was my car I'd take the pan off, break open the filter, look for garbage in the pan and filter.
Then I'd take the accumulator housing off and inpect the piston, bore, and wear around the pin.
Then I'd take the servo out and inspect it, take the seals off, put it back in and check the servo travel. It's rare but the servo pin can punch a hole in the band enough to lose second, but still have 4th.
If nothing found at after all that, take the valve body off, inspect it and clean it.
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See my post #2 in this recent thread where the OP got his trans working again by lengthening the servo pin and a few other things I suggested. (The trans was NOT removed.)
https://ls1tech.com/forums/automatic...t-trouble.html (Start at post #2 - the OP is reporting no 2nd gear.)








