4L60E Input Shaft Leaking
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Seriously, you have to replace it. Assuming you buy a new GM one, the shaft and drum come as one unit.
I recommend adding the Sonnax input drum reinforcement kit which strengthens this area with a steel ring. The kit includes a custom overrun piston which only works with the older style aluminum forward piston.
(I need to check the details, but Sonnax now also has a billet overrun piston which works with the new style steel piston.)
Thread Starter
TECH Junkie
Joined: May 2012
Posts: 3,051
Likes: 716
From: Poplarville, MS
My son is a machinist so we modified the stock input drum to except and bolt on end plate similar to the Sonnax Smart-Tech Input Drum. Installed a new input shaft along with the Sonnax input drum reinforcement kit. Anyway now it’s leaking. I removed the shaft today, cleaned it up and reinstalled it with green Loctite and left it alone for the Loctite to set up. I am hoping this will seal it up.
Are these things so acceptable to leaks when you change out the shaft?
Are these things so acceptable to leaks when you change out the shaft?
You will see some small bubbles on almost all of them.
I put them in a heated parts washer, you will find a lot of input shafts loose in the drum that way.
I press out and put green sleeve retainer on all shafts. Then press back in.
I put them in a heated parts washer, you will find a lot of input shafts loose in the drum that way.
I press out and put green sleeve retainer on all shafts. Then press back in.
Thread Starter
TECH Junkie
Joined: May 2012
Posts: 3,051
Likes: 716
From: Poplarville, MS
Thanks for the info built408.
It didn't seem right that I would have to buy a new drum and shaft just becouse of a few bubbles. The green sleeve retainer I used stopped the bubbles so I installed it. I guess time will tell if it is truely repaired.
It didn't seem right that I would have to buy a new drum and shaft just becouse of a few bubbles. The green sleeve retainer I used stopped the bubbles so I installed it. I guess time will tell if it is truely repaired.
