4l60e skipping second gear
Thread Starter
Teching In
Joined: Jun 2016
Posts: 3
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4l60e skipping second gear Hey guys I have a 2001 Silverado cammed with 4:56 gears. Has a 4l60e transmission and transgo hd2 shift kit. The kit came with a 1-2 shift valve that allows you to hold 1st gear up to any speed without shifting out. Put it in cause I thought why not. The other day I was doing burnouts and donuts on pavement with the truck in Manual 1 and I did not shift out. Truck bounced of the rev limiter like crazy and I did this about 3 different times. Had good ride until the next day my trans started to skip second gear and go into third. Even if I try manually shifting into second it won't. And if I put the pedal to the floor it immediately hits the rev limiter. I looked up common problems with the 4l60e and this does not come up. I dropped the pan and fluid is fine and no major metal on the magnet. Hooked it up to a snap on scan tool and the truck thinks it's in second gear when it's actually still in first. I'm thinking that the new shift valve I put in broke but I'm not sure. Any ideas?
Thanks
Thanks
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I don't understand what hydraulic mod the HD2 "Gear Command" shift valve performs; I've never installed it as it sounds like a dumb idea as it would allow a (unintended) manual downshift into an over-rev condition. Even without it, my trans won't upshift past the selected gear.
Perhaps you should try re-installing the stock 1-2 shift valve.
My only other suggestion is to check the servo end play - while holding a ruler next to the servo cover, press on it with a crow bar and estimate how much it moves.
End play much past .175 (3/16") indicates a worn band; usually 2nd gear then starts to slip.
Perhaps you should try re-installing the stock 1-2 shift valve.
My only other suggestion is to check the servo end play - while holding a ruler next to the servo cover, press on it with a crow bar and estimate how much it moves.
End play much past .175 (3/16") indicates a worn band; usually 2nd gear then starts to slip.
Thread Starter
Teching In
Joined: Jun 2016
Posts: 3
Likes: 0
I called transgo and they said with with the truck in neural and tires off the ground press on the servo while someone spins the driveshaft and it should stop it. I did this and my friend was still able to turn it but it was a lot harder almost to the point where he couldnt turn it. Transgo said I need a longer pin then. I don't understand why I would need a longer pin if it drove fine before.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
The band was well worn before you had your fun.
Here are some related threads that might be useful to you.
Lengthened Servo Pin:
https://ls1tech.com/forums/automatic...t-trouble.html
https://ls1tech.com/forums/automatic...-gear-all.html
https://ls1tech.com/forums/automatic...ckup-help.html
Worked:
https://ls1tech.com/forums/automatic...cond-only.html
https://ls1tech.com/forums/automatic...e-2-fixed.html
https://ls1tech.com/forums/automatic...-4th-gear.html
No 2nd Gear:
https://ls1tech.com/forums/automatic...t-trouble.html
https://ls1tech.com/forums/automatic...-my-4l60e.html
Here are some related threads that might be useful to you.
Lengthened Servo Pin:
https://ls1tech.com/forums/automatic...t-trouble.html
https://ls1tech.com/forums/automatic...-gear-all.html
https://ls1tech.com/forums/automatic...ckup-help.html
Worked:
https://ls1tech.com/forums/automatic...cond-only.html
https://ls1tech.com/forums/automatic...e-2-fixed.html
https://ls1tech.com/forums/automatic...-4th-gear.html
No 2nd Gear:
https://ls1tech.com/forums/automatic...t-trouble.html
https://ls1tech.com/forums/automatic...-my-4l60e.html
