The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-11-2022, 07:14 PM   #1
Tom
driving is in my blood
 
Tom's Avatar
 
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,687
4L60E shudder

I recently started having an issue with my 1998 pickup. The trans was rebuilt about 1/5yrs ago. When built, I went with my own supplied torque convertor. I have been unhappy with it since install, as I can tell it wasn't balanced correctly. I'm now assuming they also rebuilt the lockup clutch badly as well based on my issue...

I will randomly get what I believe is a torque convertor shudder on the freeway, followed by the TC unlocking for a mile or two before locking back up. I haven't felt the problem on side streets. Its random and not often at all, except for one long on ramp I take twice a week. After climbing up that 1/2mile uphill ramp it will shudder and unlock the TC when I reach 4th gear every time. The shuddering followed by unlocking for a bit before going back to normal makes me think the TC clutch is slipping with a heavy load and the truck is noticing and unlocking for safety?
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
Tom is offline   Reply With Quote
Old 08-13-2022, 04:48 PM   #2
LS short box
Registered User
 
Join Date: Jun 2015
Location: Carlos MN
Posts: 1,888
Re: 4L60E shudder

Wasn't 4L60E but 8L60E in 15 Silverado behind a 6.2. It developed converter shudder while still under warranty. I thought for sure they would replace the converter. Instead they used some type of trans flushing machine and ran about 25-30 quarts of tranny fluid thru the trans. It worked. Never had a problem after that.
LS short box is offline   Reply With Quote
Old 08-14-2022, 03:03 PM   #3
AussieinNC
Moderator
 
AussieinNC's Avatar
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,152
Re: 4L60E shudder

This dropping of convertor lockup is usually a sign of a bad ground in the lockup circuit or a bad convertor.

Does the fluid appear burned up?
Was a shift kit installed when the trans was rebuilt?

The lockup clutch is not normally engaged below 45 mph....and should immediately unlock under full throttle....it should not be lugging and holding on, as doing so will burn it up quickly.
__________________
Family and country before all others...

2006 Chevy Silverado (Daily Driver)
2012 Chevy Equinox

AussieinNC is offline   Reply With Quote
Old 08-16-2022, 12:55 PM   #4
Tom
driving is in my blood
 
Tom's Avatar
 
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,687
Re: 4L60E shudder

Quote:
Originally Posted by AussieinNC View Post
This dropping of convertor lockup is usually a sign of a bad ground in the lockup circuit or a bad convertor.

Does the fluid appear burned up?
Was a shift kit installed when the trans was rebuilt?

The lockup clutch is not normally engaged below 45 mph....and should immediately unlock under full throttle....it should not be lugging and holding on, as doing so will burn it up quickly.
Fluid is clean. No shift kit, well maybe little pieces of one were used lol. Clinbarger did a build thread: https://67-72chevytrucks.com/vboard/...d.php?t=812006

Lockup on this truck will happen as low as 38mph indicated in 4th gear. Been that way for 16yrs and 140k miles that I've had it. You have to be really just cruising at that speed though, and about any amount of throttle unlocks it.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
Tom is offline   Reply With Quote
Old 08-18-2022, 12:15 AM   #5
whitedog76
Registered User
 
Join Date: Jan 2014
Location: Peoria, IL
Posts: 1,450
Re: 4L60E shudder

If you do a search on the net, you'll find others with the same issue. More often than not, it seems like the TCC solenoid or valve tend to be the issue. If it goes on too long, your torque converter is toast. I know thats not what you want to hear.

When your trans was rebuilt, did they rebuild the valve body? I know sometimes a rebuild is just clutches and steels and the rest is forgotten about.

If you do end up tearing into the trans, I'm going to recommend s TransGo or Sonnax shift kit. They have valves, springs and misc. Items that freshen up the valve body. I used a TransGo kit on a 700R4, it made a huge difference.
whitedog76 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:08 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com