No 2nd Gear 4L60E
Thread Starter
Teching In
Joined: Feb 2016
Posts: 4
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No 2nd Gear 4L60E Went to lunch today and when I left I noticed truck seemed as if not shifting out of 1st until high RPMs. Then noticed on a hill when truck kicked down to second the transmission was like it was in neutral and revved to the rev limiter. I tapped the brake to kill the cruise and then transmission seemed to go back to third. 1st, 3rd & 4th all seem fine and it is like 2nd is slipping or not there at all. After doing some research it seems to me like this is a candidate for the Sonnax 7778702K Servo Pin Kit to buy a little time for a possible worn band. Does this problem usually seem to come on that fast that it just starts randomly one day when you just drove the truck 30 minutes ago and it was fine? Only reason I'm hesitant to assume this is I've never seen someone reference the trans kicking down to what seems like no second gear, it's always just complaining of skipping 2nd gear when shifting.
04 Silverado 4l60E
04 Silverado 4l60E
On The Tree
Joined: Sep 2018
Posts: 161
Likes: 4
From: New Zealand
Yeah i was going to say it sounds like a sunshell issue, but then he wouldn't have R or OD either.
If it was the band you would likely have issues with OD as well.
Low/reverse or reverse input clutches maybe??
1-2 shift solenoid? Damn we could sit here playing guessing games all day. Pull it apart and let us know.
If it was the band you would likely have issues with OD as well.
Low/reverse or reverse input clutches maybe??
1-2 shift solenoid? Damn we could sit here playing guessing games all day. Pull it apart and let us know.
TECH Junkie
Joined: Dec 2012
Posts: 3,606
Likes: 1,318
From: Iowa
Checking servo travel and doing a basic line pressure test are the most basic and effective places to start.
Sounds like you're on the right track if you do both of those.
Let us know what you find.
Sounds like you're on the right track if you do both of those.
Let us know what you find.
On The Tree
Joined: Sep 2018
Posts: 161
Likes: 4
From: New Zealand
Wouldn't 2-4 servo/band issues cause loss/issues with OD as well?
TECH Junkie
Joined: Dec 2012
Posts: 3,606
Likes: 1,318
From: Iowa
Not always.
There are two separate pistons for 2nd and 4th...they can both apply slightly different strokes.
LOTS of documented cases where you'll lose one of them (2nd or 4th) and the fix is to lengthen the pin...then you get both.
The funny part is...sometimes it's 2nd that goes first...sometimes it's 4th.
in my personal experience it's 4th that goes first MOST of the time...but not every time.
There are two separate pistons for 2nd and 4th...they can both apply slightly different strokes.
LOTS of documented cases where you'll lose one of them (2nd or 4th) and the fix is to lengthen the pin...then you get both.
The funny part is...sometimes it's 2nd that goes first...sometimes it's 4th.
in my personal experience it's 4th that goes first MOST of the time...but not every time.
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On The Tree
Joined: Sep 2018
Posts: 161
Likes: 4
From: New Zealand
Not always.
There are two separate pistons for 2nd and 4th...they can both apply slightly different strokes.
LOTS of documented cases where you'll lose one of them (2nd or 4th) and the fix is to lengthen the pin...then you get both.
The funny part is...sometimes it's 2nd that goes first...sometimes it's 4th.
in my personal experience it's 4th that goes first MOST of the time...but not every time.
There are two separate pistons for 2nd and 4th...they can both apply slightly different strokes.
LOTS of documented cases where you'll lose one of them (2nd or 4th) and the fix is to lengthen the pin...then you get both.
The funny part is...sometimes it's 2nd that goes first...sometimes it's 4th.
in my personal experience it's 4th that goes first MOST of the time...but not every time.
Still learning heaps, love working on transmissions
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TECH Junkie
Joined: Jun 2008
Posts: 3,197
Likes: 1,383
From: Nitro Alley
But they work as if they are two different servos all together...
The small piston directly under the cover is for forth gear.
Then you have a circuit separator.
Then a larger piston for second gear.
On The Tree
Joined: Sep 2018
Posts: 161
Likes: 4
From: New Zealand
Realistically the transmission has one bore for both servos that share a common apply pin.
But they work as if they are two different servos all together...
The small piston directly under the cover is for forth gear.
Then you have a circuit separator.
Then a larger piston for second gear.
But they work as if they are two different servos all together...
The small piston directly under the cover is for forth gear.
Then you have a circuit separator.
Then a larger piston for second gear.
What is the purpose of a separate piston to apply the same pin? wouldn't it have been simpler to just have the same piston apply for both 2 and OD? Forgive my ignorance, just learning.
TECH Junkie
Joined: Dec 2012
Posts: 3,606
Likes: 1,318
From: Iowa
2nd piston applies 2nd...3rd gear actually acts on the back side of that same piston to push against it and release the band.
4th comes on to push back and re-apply the pin.
I'm not going to speculate on what would have been simpler or more complicated...The valve body and sequencing of valves worked for the 700r4 when it was designed...that's what the engineers chose...and that's what stuck as the years went on.
4th comes on to push back and re-apply the pin.
I'm not going to speculate on what would have been simpler or more complicated...The valve body and sequencing of valves worked for the 700r4 when it was designed...that's what the engineers chose...and that's what stuck as the years went on.
