New 4L60 build, notchy 2-3 shift. - 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 06-19-2008, 01:55 AM
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
New 4L60 build, notchy 2-3 shift.

My latest 4L60 build, this one is for ME.

'89 2WD truck core
13 vane pump
TransGo hardened rings and big slide spring
Ground PR valve land
.471 boost valve
New reverse drum
Wide carbon band HD anchor
Resized reverse piston orfice
Alto reds with kolene steels
Z-pak 3-4 clutch
5-pinion GM planets- the build price goes up quickly here.
Closed input drum orifice
29 element fwd sprag
New bushings, thrusts.
Beast shell
Wide low/rev roller
TransGo 700 2&3 recal kit (auto)
Governor recal kit
Fairbanks billet 2&4 servo
TransGo seperator plate
Orifice'd low/rev piston .030


That should just about be IT. This thing is quite aggressive, but will play nice when I'm just putting around. Had a 'no 4th' deal at first, but went heavier on weight and spring in the governor, then played with the TV adj. and all is well. Except one last thing:

I have a notchy 2-3 shift in D3. This appears to subside when in D4, (over run off..?) I say notchy meaning that I think the 2-4 band isn't releasing quick enough when the 3-4 clutch comes on. It kind of noses over quickly then immediately pops into 3rd. Imagine your head nodding forward-back real quick but not violently. Most noticeable at light throttle.

Definitely need to get this smoothed out before I get happier with the throttle.

The servos I have, furnished a rather heavy red return spring.

Do I need to get more 3rd oil into the servo bore to force off the big servos quicker? Any other things to check?

Am I barking up the right tree? Any thoughts or prayers?

    Advertisement

Last edited by C-10; 06-19-2008 at 02:02 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-21-2008, 04:38 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: 8,130
Wiki Edits: 1659

Thanks: 358
Thanked 104 Times in 100 Posts
couple of items;

describe the "closed orifice" in the input drum.

The billet 2-4 servo....... If it is the large billet style servo , replacing the OEM release spring with a t-400 coasting band spring will increase the release speed of the 2-4 band.

It may be a stiffer spring than the provided one.. perhaps not.

What is the clearance set to for the 2-4 servo? I set at 1/8 inch movement of the servo cover

__________________
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
  #3 (permalink)  
Old 06-21-2008, 10:38 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
Hey Crosley.

Input drum, (pic-arrow) JB weld from the inside.

2-4 servo, using the Superior K012 & K034... return spring is pretty darn heavy. Could try the TH400 spring.

2-4 servo is .120"- I used a dial indicator, depressing cover minus o-ring with clip in place.

Thanks for the reply.
Attached Thumbnails
Click image for larger version

Name:	IN DRUM.jpg
Views:	78
Size:	31.8 KB
ID:	30760  
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-27-2008, 12:09 AM
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
A thread bump...

I still would like to 'clean up' the 2-3 shift in this trans. I've done some tinkering and it stays consistently -well, notchy. Different 2-4 servos, release springs have been tried, 2-4 band preload is good.

It's just a toy for me and not a daily driver, but I really would like to get the upper hand on this thing.

I found a product from Sonnax. The links should give you the info for all the trans enthusiasts out there. I *think* this part will do the trick based on my seat 'o' the pants feel of the 2-4 band release and 3-4 clutch application NOT being synchronized in my trans...

Give these links a look. Has anybody used this part?

Thanks.

http://www.sonnax.com/announcements/77701-076.pdf

http://www.sonnax.com/instructions/77701-076-IN.pdf
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
loose 2-3 shift in a C-4 powerrodsmike Transmission - Rearend 4 11-17-2007 11:56 AM
4l60 shift improver kit runn141 Transmission - Rearend 8 11-16-2007 06:04 PM
slight clunk/ shift kit install Q's HARVICKx29 Transmission - Rearend 2 02-16-2004 09:51 PM
transmission shift too early? CurtisL Transmission - Rearend 4 11-05-2003 11:41 AM
TH-350, low rpm 1/2 shift gearhead_383 Transmission - Rearend 7 10-30-2003 08:52 AM


All times are GMT -6. The time now is 03:01 AM.


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.