4l60E issues - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 05-30-2008, 06:06 PM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
4l60E issues

I finally got the trans in my truck that i rebuilt.

I have no d or OD. If i put the selector in drive/OD it just freewheels. if i put it in 2 or 1 the truck will move. Reverse seams ok. Where do i start looking for the problem??

The trans did something like this orginally, before i took it out but i did not get a chance to drive it. Can there be something wrong electrically that would cause this??

I did not replace any of the electronics, i did check them all with my meter acording to the manual and they seam fine.


Keith

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-30-2008, 06:56 PM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
more info

I just hooked a pressure gage up. I do not have the tech one tool to increase the amps to the pressure control solenoid. so this is all static line pressure in all the gears.

All the gears have 80 lbs of line pressure, reverse will drop to about 40 lbs for a second when you engage it but go right back up to 80.

Not sure that this means any thing with the tech 1 tool not hooked up??

Keith
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-30-2008, 07:36 PM
Registered User
 
Join Date: Oct 2006
Location: VIRGINIA
Posts: 690
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
4l60e

Keith, this sounds like a mechanical problem, like an input sprag, this is not an electronic problem, can you be more specific when you say "the trans did something like this before".

Would it not move in the drive or overdrive position, before the rebuild?

Dana
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-30-2008, 07:58 PM
C-10's Avatar
Revolution Calling
 

Last journal entry: Poverty caps live on.
Last photo:
Join Date: Apr 2008
Location: Nashport, Ohio
Posts: 920
Wiki Edits: 0

Thanks: 2
Thanked 6 Times in 6 Posts
Ditto on the mechanical problem.. Did you have the forward sprag apart for cleaning and inspection? They will go back together backwards.

Maybe a cut lip seal in the forward clutch piston?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-30-2008, 08:03 PM
Registered User
 
Join Date: Oct 2006
Location: VIRGINIA
Posts: 690
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
4l60e

C-10, remember, this trans may have been doing this prior to the rebuild.["maybe a cut lip seal in the forward clutch piston"].
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-30-2008, 08:07 PM
C-10's Avatar
Revolution Calling
 

Last journal entry: Poverty caps live on.
Last photo:
Join Date: Apr 2008
Location: Nashport, Ohio
Posts: 920
Wiki Edits: 0

Thanks: 2
Thanked 6 Times in 6 Posts
Quote:
Originally Posted by briscoe
C-10, remember, this trans may have been doing this prior to the rebuild.["maybe a cut lip seal in the forward clutch piston"].
true, true.

maybe Keith can clarify.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-30-2008, 08:12 PM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
trans

I did not drive the truck so i really can't say what it did before. I might be able to ask the guy tomorrow if he had to put the selector in 2nd to make it move.

Just a question, if it was the foward sprag why would putting the selector in 2nd make the truck move but if i move it to drive it acts just like neutral??

There is zero engagement in od/or d, the truck asct just like the trans is in park or neutral.

I did have the foward sprag apart during the rebuild, and i re-assembled it like the atsg manual shows, but i guess i could have gotten it wrong..

Keith
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-30-2008, 08:18 PM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
also

Not sure if this is related, but the air bag and anti-lock lights are on also.

Keith
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-30-2008, 08:51 PM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Morris update 9-28-2014
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,181
Wiki Edits: 1659

Thanks: 416
Thanked 107 Times in 103 Posts
addittional items are applied in 2 - 1 , so the vehicle moves.

the forward sprag is backwards.

Pressure drop in R.. then back up is probably from the poor design of Gm on the aluminum piston in the reverse input drum. That hole in the piston should be down sized about 1/2 the diameter .


You should see a pressure rise if you push the gas pedal down as the engine runs.

Reverse should be boosted to about 110 -125 psi . It will be higher than the forward gears.

__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-30-2008, 10:18 PM
Registered User
 
Join Date: Jan 2006
Location: Edmonton
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
drive at idle 55-65
drive at stall 170-190
reverse at idle 65-80
reverse at stall 300-325
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 05-31-2008, 05:07 AM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
trans

Quote:
Originally Posted by Crosley
addittional items are applied in 2 - 1 , so the vehicle moves.

the forward sprag is backwards.

Pressure drop in R.. then back up is probably from the poor design of Gm on the aluminum piston in the reverse input drum. That hole in the piston should be down sized about 1/2 the diameter .


You should see a pressure rise if you push the gas pedal down as the engine runs.

Reverse should be boosted to about 110 -125 psi . It will be higher than the forward gears.


Ok i did try applying more gas and the pressure does rise.

I am putting it up on stands and yanking the trans back out. Not to be stupid but your 100% sure it's the foward sprag installed backwards???

Keith
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 05-31-2008, 08:11 AM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Morris update 9-28-2014
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,181
Wiki Edits: 1659

Thanks: 416
Thanked 107 Times in 103 Posts
Quote:
Originally Posted by k-star
Ok i did try applying more gas and the pressure does rise.

I am putting it up on stands and yanking the trans back out. Not to be stupid but your 100% sure it's the foward sprag installed backwards???

Keith

I'll tell you this;

the vehicle does not move forward in "OD" or "D" .. this usually indicates a forward clutch pack problem or sprag backwards.

When the shifter is in "OD" or "D" , then moved to 2 or 1... the oil is still routed to the forward clutch pack. There are no solenoids applied or released.

IF the forward sprag is not backwards , you have a problem in the forward clutch pack because the power HAS to be transmitted through the forward clutch to move the vehicle.

So.. lets recap;

The vehicle moves forward in 1 & 2 shifter positions per your post. This tells me the forward clutch is operating. The pressure does not seriously drop when the trans is shifted to "OD or "D" , so I am guessing the seals are holding pressure

It does not move in "OD or "D" ..... then it does in lower gear shifter position.

this takes me back to the forward sprag installed backwards.

In my opinion the trans still has to come apart for a repair


__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 05-31-2008, 09:23 AM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
trans

Thanks, it's on it way out...should be on the stand by lunch, unless a customer stops and hold me up L.O.L.

Keith
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 05-31-2008, 11:04 AM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
up-date

Got it out, and apart,,,, the foward sprag is on backwards.... I need to fire the guy that did that...wait it was me,,,I am still going to fire me!!!

Crosley, i guess i should install those cup plugs that come in the SK-4l60E kit while i haved it apart (in the reverse piston)

Is it ok to use the scarf cut seals on the stator spport, or do i need to install the tefflon seals and size them??

Keith
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 05-31-2008, 01:50 PM
C-10's Avatar
Revolution Calling
 

Last journal entry: Poverty caps live on.
Last photo:
Join Date: Apr 2008
Location: Nashport, Ohio
Posts: 920
Wiki Edits: 0

Thanks: 2
Thanked 6 Times in 6 Posts
For me,..I always use the white teflon ones. If you have the tool, it's a snap. Also I use the 4 white uncut seals on the input shaft too.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
4L60E Weak Reverse rsruss800 Transmission - Rearend 3 03-23-2008 06:00 PM
4l60e issues Screemincheetawheely Transmission - Rearend 1 03-06-2007 09:49 PM
Lowering - Camber issues 49lincoln Suspension - Brakes - Steering 1 05-25-2006 01:24 AM
4L60E 4x4 tarmon8r Transmission - Rearend 0 03-10-2006 08:47 PM
4L60E issues - advice- maybe Crossley? Tim240Z Transmission - Rearend 0 11-19-2005 10:29 PM


All times are GMT -6. The time now is 12:34 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.