Fresh rebuilt 4l60e question
Fresh rebuilt 4l60e question Just got the trans back in and I have a question when it goes to what I think is od light throttle let's it slips up to about 2k at 40 and I have to let completely off the throttle for it to go into od what would cause this??
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Verdad Gallardo drove it home about 120 miles and after i let the car cool off went to back out garage for another drive it acted as if there was no reverse i gave it a little more gas then it kinda dropped into reverse. i took off for the drive everything perfect all forward gears went to back up and nothing!! what would cause this i mean reverse is now like neutral nothing at all. I was looking at the powerflow sheet and all i see applied in reverse are the soleniods a&B reverse input clutch, and lo/reverse clutch i know its not the soleniods because they are on in 1st and all forward gears are perfect as well as the lo reverse clutch is applied in low range 1st and it works fine just no reverse and all that leaves is the reverse input clutch correct? Thanks for your help im really thinking about just buying a built trans and getting it over with
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
The most common (or at least very common) reason for losing reverse is worn/torn teflon rings on the stator shaft; reverse fluid goes between them into the reverse drum.
Installing the pump can rip a teflon ring, especially if the builder did not keep the rings "resized" until the last minute.
Another possibility, is that the area inside the reverse drum where the teflon rings run was very worn and the reverse drum was not replaced.
When rough, a few hundred miles could wear out the teflon rings.
Do you know if the reverse drum was replaced?
Did you or a shop rebuild the trans?
Installing the pump can rip a teflon ring, especially if the builder did not keep the rings "resized" until the last minute.
Another possibility, is that the area inside the reverse drum where the teflon rings run was very worn and the reverse drum was not replaced.
When rough, a few hundred miles could wear out the teflon rings.
Do you know if the reverse drum was replaced?
Did you or a shop rebuild the trans?
The most common (or at least very common) reason for losing reverse is worn/torn teflon rings on the stator shaft; reverse fluid goes between them into the reverse drum.
Installing the pump can rip a teflon ring, especially if the builder did not keep the rings "resized" until the last minute.
Another possibility, is that the area inside the reverse drum where the teflon rings run was very worn and the reverse drum was not replaced.
When rough, a few hundred miles could wear out the teflon rings.
Do you know if the reverse drum was replaced?
Did you or a shop rebuild the trans?
Installing the pump can rip a teflon ring, especially if the builder did not keep the rings "resized" until the last minute.
Another possibility, is that the area inside the reverse drum where the teflon rings run was very worn and the reverse drum was not replaced.
When rough, a few hundred miles could wear out the teflon rings.
Do you know if the reverse drum was replaced?
Did you or a shop rebuild the trans?
I did the rebuild and didnt replace the drum so looks like ill be replacing it
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
(I bought this trans off CL for $75 because it had no reverse. No surprise.)
Notice that not only is the bushing extremely worn, but the silver area between the bushings is worn too; this is where the teflon seals run and that area needs to be smooth as glass.
Assuming this is the problem and you replace the reverse drum, you might consider getting a wide band too.
Look on whatever it takes transmission parts web site. They will have all the stuff you need. If you call there ask for Bill Madox and tell him I sent you. As far as verifying the problem thats kind of a no brainer. Open it up and inspect it! Low fluid level and also a worn boost valve sleeve can cause issues with reverse. HTH Vince
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I bought the Alto Red Wide band from PATC; but I'm sure they are available from many sources.
To confirm the problem:
As you remove the pump, input drum and reverse drum, reassemble them upside down for an air test. I suspect the reverse test will leak air big time.
(This assumes the teflon rings are not obviously ruined.)
Then retest after making any fixes.
Other reasons reverse might fail:
1. Reverse piston seal leak.
2. Bellville plate installed upside down.
3. Leaking or mis-assembled boost valve (as Vince mentioned).
Since you had reverse at first, and then it died during normal driving, I suspect it is the reverse drum and/or teflon seals.
To confirm the problem:
As you remove the pump, input drum and reverse drum, reassemble them upside down for an air test. I suspect the reverse test will leak air big time.
(This assumes the teflon rings are not obviously ruined.)
Then retest after making any fixes.
Other reasons reverse might fail:
1. Reverse piston seal leak.
2. Bellville plate installed upside down.
3. Leaking or mis-assembled boost valve (as Vince mentioned).
Since you had reverse at first, and then it died during normal driving, I suspect it is the reverse drum and/or teflon seals.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
GM recommends Dextron VI for this trans in their recent cars; it is a100% synthetic.
It is expensive at the local auto stores ($8/quart); my (very) friendly local trans shop sold me a case of 12 quarts at their cost of $48.
Since I experiment a lot and want to reuse nearly-new fluid as much as possible, I first pump out the existing fluid through the dipstick with a cheap hand pump into a spotlessly clean 1 gallon jug. (e.g. windshield washer fluid or even milk jug). I get about 3-1/2 quarts out that way. I have a drain plug on my pan; I drain into a very clean pan and get another 3-4 quarts out that way. I immediately pour that into another jug. This way no bugs or dirt get into the the fluid to be reused.
Its hard to save the remaining fluid; I'm happy when I don't spill the converter's fluid on my head.
It is expensive at the local auto stores ($8/quart); my (very) friendly local trans shop sold me a case of 12 quarts at their cost of $48.
Since I experiment a lot and want to reuse nearly-new fluid as much as possible, I first pump out the existing fluid through the dipstick with a cheap hand pump into a spotlessly clean 1 gallon jug. (e.g. windshield washer fluid or even milk jug). I get about 3-1/2 quarts out that way. I have a drain plug on my pan; I drain into a very clean pan and get another 3-4 quarts out that way. I immediately pour that into another jug. This way no bugs or dirt get into the the fluid to be reused.
Its hard to save the remaining fluid; I'm happy when I don't spill the converter's fluid on my head.
GM recommends Dextron VI for this trans in their recent cars; it is a100% synthetic.
It is expensive at the local auto stores ($8/quart); my (very) friendly local trans shop sold me a case of 12 quarts at their cost of $48.
Since I experiment a lot and want to reuse nearly-new fluid as much as possible, I first pump out the existing fluid through the dipstick with a cheap hand pump into a spotlessly clean 1 gallon jug. (e.g. windshield washer fluid or even milk jug). I get about 3-1/2 quarts out that way. I have a drain plug on my pan; I drain into a very clean pan and get another 3-4 quarts out that way. I immediately pour that into another jug. This way no bugs or dirt get into the the fluid to be reused.
Its hard to save the remaining fluid; I'm happy when I don't spill the converter's fluid on my head.
It is expensive at the local auto stores ($8/quart); my (very) friendly local trans shop sold me a case of 12 quarts at their cost of $48.
Since I experiment a lot and want to reuse nearly-new fluid as much as possible, I first pump out the existing fluid through the dipstick with a cheap hand pump into a spotlessly clean 1 gallon jug. (e.g. windshield washer fluid or even milk jug). I get about 3-1/2 quarts out that way. I have a drain plug on my pan; I drain into a very clean pan and get another 3-4 quarts out that way. I immediately pour that into another jug. This way no bugs or dirt get into the the fluid to be reused.
Its hard to save the remaining fluid; I'm happy when I don't spill the converter's fluid on my head.
