Adjusting bands on auto tranny -- wonderful!
#1
Adjusting bands on auto tranny -- wonderful!
Okay, I did this per this write up on ExplorerForum:
http://www.explorerforum.com/forums/...d.php?t=158160
Pretty simple really. Hardest thing is getting the shift linkage out of the way. I simply pressed in the retainers and slid the collar towards the front of the truck and pulled it out of the bracket, leaving it attached to the arm on the tranny that actually moves to change gears.
IF YOU DO IT THAT WAY: CHOCK YOUR WHEELS SO YOU PANTS DON'T FILL UP!!!
DOH! -- When I was under there I pushed the linkage back and the tranny went in neutral and the truck rolled about 6 inches -- scaring the crap out of me, ha ha!
Anyway, a 3/8" 12 point socket fits the square adjuster end perfectly. I used a 240 inch/pound 3/8" torque wrench set at 120 inch/pounds (10 foot/pounds)
I had to back the locknut off quite a bit to be able to adjust it -- indicating wear or stretch in the bands or anchors most likely. You tighten the adjusters to 10 foot/pounds then back them off two full turns and lock them down.
The result? Man, this thing shifts like a new truck. Little to no 2-3 "flare" compared to where it was. It's very, very different -- firm but not bumpy.
I did not use new locknuts like the how-to I linked. I'm taking the tranny out to fit it with a 4x4 tailshaft and rebuild the frictions and EPO solenoid in the spring and I'll put new ones on then. I just cleaned well around the area and tightened the original ones back down.
I highly recommend this if your tranny, like mine, has like 75,000 miles of hard use on it. Might be of benefit even with less mileage, I'm not sure.
http://www.explorerforum.com/forums/...d.php?t=158160
Pretty simple really. Hardest thing is getting the shift linkage out of the way. I simply pressed in the retainers and slid the collar towards the front of the truck and pulled it out of the bracket, leaving it attached to the arm on the tranny that actually moves to change gears.
IF YOU DO IT THAT WAY: CHOCK YOUR WHEELS SO YOU PANTS DON'T FILL UP!!!
DOH! -- When I was under there I pushed the linkage back and the tranny went in neutral and the truck rolled about 6 inches -- scaring the crap out of me, ha ha!
Anyway, a 3/8" 12 point socket fits the square adjuster end perfectly. I used a 240 inch/pound 3/8" torque wrench set at 120 inch/pounds (10 foot/pounds)
I had to back the locknut off quite a bit to be able to adjust it -- indicating wear or stretch in the bands or anchors most likely. You tighten the adjusters to 10 foot/pounds then back them off two full turns and lock them down.
The result? Man, this thing shifts like a new truck. Little to no 2-3 "flare" compared to where it was. It's very, very different -- firm but not bumpy.
I did not use new locknuts like the how-to I linked. I'm taking the tranny out to fit it with a 4x4 tailshaft and rebuild the frictions and EPO solenoid in the spring and I'll put new ones on then. I just cleaned well around the area and tightened the original ones back down.
I highly recommend this if your tranny, like mine, has like 75,000 miles of hard use on it. Might be of benefit even with less mileage, I'm not sure.
Last edited by n3elz; 12-27-2006 at 08:13 PM.
#2
#5
Correct. Auto's have planetary gears which change ratios by, in most cases, immobilizing the outer ring gear by clutching or "braking" it with a friction band driven by hydraulic servo pistons.
The adjustment puts the band in the correct tension so that less motion of the piston is required for actuation, resulting in quicker shifts and positive retention of the ring gear.
The adjustment puts the band in the correct tension so that less motion of the piston is required for actuation, resulting in quicker shifts and positive retention of the ring gear.
#7
It's simple really, but if you don't remove the DTR switch (digital transmission range switch) then the one locknut on the rear band is a pain to get the right angle on and they are quite tight. Other than that, having that low-range torque wrench is the biggest hurdle. I borrowed it from James (Rangerless), my son-in-law.
#9
Originally Posted by n3elz
Correct. Auto's have planetary gears which change ratios by, in most cases, immobilizing the outer ring gear by clutching or "braking" it with a friction band driven by hydraulic servo pistons.
The adjustment puts the band in the correct tension so that less motion of the piston is required for actuation, resulting in quicker shifts and positive retention of the ring gear.
The adjustment puts the band in the correct tension so that less motion of the piston is required for actuation, resulting in quicker shifts and positive retention of the ring gear.
dude you talk like a robot or a human text book
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The 2-3 shift "flare" where RPM's suddenly jump before 3rd gear cuts in is common. This seems to help that a lot, at least in my case. Also, back 40,000 miles or so ago I went to Amsoil synthetic which also helped.
There are a couple of problems which are common to our automatics though. The EPC solenoid is a pressure regulation valve that works on the same principle as the IAC valve -- pulse width control. It adjusts the line pressure to control shift quality.
If the EPC gets virtually ANY dirt in it, it starts to "hang up" and you get poor shifting. It is double-filtered, but still sometimes gets crap in it. Also, it is very tight tolerance and tends to wear quickly as it is thrashed all over the place with every throttle position change. Many who work on this transmiission recommend replacement of the EPC when you do any work on the tranny, as a preventive maintenance item -- but it's not a cheap item.
Servo's can also develop internal leaks which keep them from putting proper pressure on bands or doing it fast enough.
There are other "frictions" in the transmission called clutches and they are just that. They allow whole sets of gears to come into play or not. They can also wear.
My symptoms were more 2-3 shift flare, and just general "sloppiness" between the gears like they were taking too long to change. All those symptoms are gone now and the transmission shifts like it used to.
However, one should remember that the frictions are wearing and the harder the service the faster the wear. They will eventually need to be replaced and that's what an automatic rebuild is usually all about, as well as any remdial work on the valve body and servo's.
Also, if you look at the ExplorerForum site where I linked the article on this, there are other articles/posts on the 5R44E/5R55E transmission that talk about a bad valve body gasket issue that is a TSB from Ford I believe. Worth doing some reading over there through the stickys in the transmission and transfer case forum to research any problem you might be having.
There are a couple of problems which are common to our automatics though. The EPC solenoid is a pressure regulation valve that works on the same principle as the IAC valve -- pulse width control. It adjusts the line pressure to control shift quality.
If the EPC gets virtually ANY dirt in it, it starts to "hang up" and you get poor shifting. It is double-filtered, but still sometimes gets crap in it. Also, it is very tight tolerance and tends to wear quickly as it is thrashed all over the place with every throttle position change. Many who work on this transmiission recommend replacement of the EPC when you do any work on the tranny, as a preventive maintenance item -- but it's not a cheap item.
Servo's can also develop internal leaks which keep them from putting proper pressure on bands or doing it fast enough.
There are other "frictions" in the transmission called clutches and they are just that. They allow whole sets of gears to come into play or not. They can also wear.
My symptoms were more 2-3 shift flare, and just general "sloppiness" between the gears like they were taking too long to change. All those symptoms are gone now and the transmission shifts like it used to.
However, one should remember that the frictions are wearing and the harder the service the faster the wear. They will eventually need to be replaced and that's what an automatic rebuild is usually all about, as well as any remdial work on the valve body and servo's.
Also, if you look at the ExplorerForum site where I linked the article on this, there are other articles/posts on the 5R44E/5R55E transmission that talk about a bad valve body gasket issue that is a TSB from Ford I believe. Worth doing some reading over there through the stickys in the transmission and transfer case forum to research any problem you might be having.