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Hey guys this is only the 2nd 4l60e I've ever attempted to rebuild. Im giving it a go for my brothers car after he lost 3rd gear. Was just wondering why the input drum is so worn were it engages with the reverse clutches. Want to make sure I address all the issues I find along the way
The only other issues other then burnt up 3/4 clutch pack was some check ball damage to the separator plate. Is the damage in the photo warrant buying a new input drum? I would assume it could make the clutches bind up if they don't have a smooth service to slide against or do the return springs provide enough force I shouldn't worry to much?
Most likely its the belleville plate in reverse drum that does that. Im told, if you replace it with a waved plate from Raybestos it will alleviate this issue.
Regarding your 3/4 clutch failure, please dont just replace the clutch pack and go. Do your research, find the problem or problems, and fix them before reassembly. If you dont, you will find yourself replacing it again.....
Thank you for the advice. I was going to throw a new reverse drum in it so I'll ask the supplier about the wave steal
I haven't found the 3/4 clutch problem yet but Teflon seals and input drum pistons look to be in good shape. I'm suspecting hydraulic leak in valve body. I did notice the 2 4 servos are loose as well
The wear on the input drum is from the dished beveled plate in the bottom of the reverse input drum. That plate rattles back and forth in the drum. I wears the splines in the bottom of the drum, then as it wear's it cuts or rubs the input drum splines. Yours is not to bad and could be reused with a new revers input (band) drum..
Most likely its the belleville plate in reverse drum that does that. Im told, if you replace it with a waved plate from Raybestos it will alleviate this issue.
Regarding your 3/4 clutch failure, please dont just replace the clutch pack and go. Do your research, find the problem or problems, and fix them before reassembly. If you dont, you will find yourself replacing it again.....
This is what the Belville steel does. Replace the Belville steel with a reverse input waved steel from the 1982 - 1986 700R4, and get the 4 reverse input clutches used in the 1982 - 1986 reverse input for the 700R4. These clutches are .080" in thickness compared to the stock clutches are .070" in thickness. This setup will allow you to reuse the input drum shown, reuse the reverse input drum you have, and windup with almost the same clutch clearance as with the old setup. This will prevent any future wear and stops the excess metal that gets into the oil from the wear of the Belville steel. This setup works very well, and I have been doing this for well over 25 years with no problems.
This is what the Belville steel does. Replace the Belville steel with a reverse input waved steel from the 1982 - 1986 700R4, and get the 4 reverse input clutches used in the 1982 - 1986 reverse input for the 700R4. These clutches are .080" in thickness compared to the stock clutches are .070" in thickness. This setup will allow you to reuse the input drum shown, reuse the reverse input drum you have, and windup with almost the same clutch clearance as with the old setup. This will prevent any future wear and stops the excess metal that gets into the oil from the wear of the Belville steel. This setup works very well, and I have been doing this for well over 25 years with no problems.
thank you. I'll ad it to the parts list so I don't wear out the new pieces I have
I actually found a very good condition input drum and reverse input drum out of another gearbox that had stripped out a couple years ago. Just goes to show it always pays to store parts correctly because you never know when you need them
Most likely its the belleville plate in reverse drum that does that. Im told, if you replace it with a waved plate from Raybestos it will alleviate this issue.
Regarding your 3/4 clutch failure, please dont just replace the clutch pack and go. Do your research, find the problem or problems, and fix them before reassembly. If you dont, you will find yourself replacing it again.....
I did find the checkball in the case leaking plus it had the original plastic pistons in the valve body which were very loose around the pins
I might send the valve body off to the tranny shop and get them to check all the circuits properly for me
I did find the checkball in the case leaking plus it had the original plastic pistons in the valve body which were very loose around the pins
I might send the valve body off to the tranny shop and get them to check all the circuits properly for me
Be sure to check the fitment of the input shaft to the drum. You can pressure test it to make sure its not leaking. Also, make sure the drum is warm when you do this
10-22-2022, 05:09 AM
What made my input drum wear? 
