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98 4l60e no second gear after sunshell replacement
Hey guys brand new to the forum, brand new to auto trans disassembly. I hope I can get some help here although I am not ls1. I read a few posts here that you guys have the best help/ members and great knowledge of the 4l60e.
I have a 98 tahoe that had met the demise of a sun shell. It shifted great before the sun shell so I decided to replace just the sunshell to get back on the road. All went well and I went for a test drive.
During the test drive the servo popped out of the case, i must not have seated the snap ring completely.
Got towed home, popped servo back in, and not it shifts from 1 to 3rd at 3500rpm unless I let off throttle, then it will shift at 3k rpm. Did i ruin my servo? Or is it possible that the band moved and when I stabbed the servo back into place I missed the ring on the band? Thanks for any input
I bet you didn't seat the band in the anchor during install or after your servo popped out the band popped off the anchor pin. you're going to have to drop the pan and pull the valve body to fix it. Well that is if the band didn't get damaged or rotate. other wise you will need to pull the trans and then the pump back out to repair.
So is it unlikely to miss the band when you put the servo back in?
As Tranzman said, when the servo popped out most likely a sealing ring came out of position and when you popped the servo back in you cut one of the rings. Or ones of the rings came completely off. Did you pull the servo all of the way out and inspect rings before reinstalling it?
So is it unlikely to miss the band when you put the servo back in?
The 4L60E has two lugs that hold the pin side of the band in place pretty well. The lug side is a different thing. If the case lug was left out it wouldn't hold the band in place. Some people put the band in the case before installing the input drums. I never got used to doing it that way. I install the input drums and the band goes in after that. That's when I install the case lug.
I appreciate all the replies, I am sure I got the pin back in that holds the other end of the band. I pulled some pieces of the servo out, more then I wanted to. I pulled the outer 2 or 3 pieces out. I am/was thinking I missed the lock ring in the band when I put the servo back in. Is it possible to line that lock ring back up without having to drop the pan and valve body? What seals would I be looking at for when I pull the servo back out? Hopefully will get time to look at it tomorrow or this weekend. How do I still have 4th?
There are 2 teflon rings around the 2nd gear servo piston and 1 teflon ring around the 4th gear servo piston. There is also a red o-ring on the divider and a blue o-ring on the cover. All of that needs to be inspected for damage or missing. The pin in most instances goes right back in place on the band.
In your first post you said you only had 1st and 3rd. That's why I stated the band popped off the pin. So if you have R 1st 3rd and 4th, you have other issues.
I appreciate all the replies, I am sure I got the pin back in that holds the other end of the band. I pulled some pieces of the servo out, more then I wanted to. I pulled the outer 2 or 3 pieces out. I am/was thinking I missed the lock ring in the band when I put the servo back in. Is it possible to line that lock ring back up without having to drop the pan and valve body? What seals would I be looking at for when I pull the servo back out? Hopefully will get time to look at it tomorrow or this weekend. How do I still have 4th?
The 2-4 servo has 3 seperate functions to it.
1st) There is a 1-2 apply servo for 2nd gear.and a inner piston housing that seperates the 1-2 side from the 3-4 side. 2nd apply oil never stops being fed to this.
2nd) There is a 2-3 accumulator side of the 1-2 servo 3rd oil is supplied to push the band off, this band release oil also never stops being fed. (at least until you downshift to 1st)
3rd) there is a 4th apply piston and the cover that holds the snap ring holds in. 4th oit gets applied and the combination of 4th & 2nd oil overcomes the 3rd oil and pushes the band back on.
So 4th could be intact and 1 of 2 rings for 2nd could be cut or missing.
Which type of Seals were used on the Servo Pistons...
The Square Scarf-Cut Teflons or the Rubber D-Rings?
The Rubber D-Rings Seal somewhat better, but they are easy to twist and prevent a proper seal for the DIY Guy/ inexperienced.
The Square Scarf-Cut Teflons are easier to install correctly using some Assembly Gel to hold the Split Halves together...
But do not Air-Check/ Seal as well as the Rubber D-Rings.
Sorry, I was in a hurry when I posted that and tried keeping it short. Yes I have 1,3,4 and r. Although i need to adjust my neutral safety switch as I can not get the 1 indicator to light if I manually shift it. So since I have everything but 2nd, what's that mean?
Ok tranz thanks, I will have to pop the servo back out and check. I saw one seal was off when I was fiddling with it, and put that back on. But i will pull it and make sure there are no more that fell off or that are ripped, how many will be split? And then will I be able to see the band through where the pin goes to make sure that's lined up?
Thanks bbond I will check that. So if 4th is holding, would it hold if the servo pin missed the lock ring? I'm really concerned if that's not lined up as I don't want to drop the valve body
Thanks bbond I will check that. So if 4th is holding, would it hold if the servo pin missed the lock ring? I'm really concerned if that's not lined up as I don't want to drop the valve body
No, 4th would not hold if pin was not engaging the band.
Tranzman and bbond for the win! Thanks guys. What was interesting was this was out of its groove as well as having the rip. So I'm assuming it was in its groove when i popped it back in, and that when doing so i ripped it, and knocked it out of its groove? Any tricks to install it when i put a new one in?
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98 4l60e no second gear after sunshell replacement 
