Transmission leak - 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 09-23-2012, 08:15 AM
Bobs36ford's Avatar
Registered User
 

Last journal entry: Video of new upholstery
Last photo:
Join Date: Sep 2010
Location: virginia
Age: 78
Posts: 101
Wiki Edits: 0

Thanks: 57
Thanked 0 Times in 0 Posts
Transmission leak

Hi
I have a 350 turbo chevy trans in my 36 Ford. I am going nuts trying to stop trans leak. I've changed the manufactures gasket three times myself then bought an aluminum pan changed gasket again ...still leaked.

I finally took my car to AAMCO they changed gasket and it still leaked with aluminum pan. I then decided to let AAMCO try with manufactures gasket.....guess what , it still leaks.

I've tried cork gaskets and rubber gaskets. I've put a metal ruler on trans to make sure its true and its OK.

Any ideas?

Bob

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-23-2012, 08:43 AM
RWENUTS's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Nanaimo, BC, Canada
Age: 63
Posts: 1,989
Wiki Edits: 0

Thanks: 59
Thanked 212 Times in 200 Posts
Have you checked the vent?
Reply With Quote Quick reply to this message
The Following User Says Thank You to RWENUTS For This Useful Post:
Bobs36ford (09-23-2012)
  #3 (permalink)  
Old 09-23-2012, 09:37 AM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Bar under the dash
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,101
Wiki Edits: 1659

Thanks: 340
Thanked 102 Times in 98 Posts
You either have a crack at the pan rail for the leak at the pan or it is not the pan leaking. Oil can leak from one location , then travel around the edges to drip off some place away from the actual leak
__________________
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
The Following User Says Thank You to Crosley For This Useful Post:
Bobs36ford (09-23-2012)
  #4 (permalink)  
Old 09-24-2012, 09:06 AM
454 Rattler's Avatar
NEVER SATISFIED !!
 
Last photo:
Join Date: Sep 2006
Location: Eagle River WI.
Age: 70
Posts: 898
Wiki Edits: 0

Thanks: 5
Thanked 34 Times in 33 Posts
I thought you would get more answers than this.

These transmissions have a habit of leaking if they sit unused for a while.

I would suggest that you wipe it off and take it for a short ride, then re-check to see if it's the gasket or some place else.

Good Luck !


454 RATTLER
Reply With Quote Quick reply to this message
The Following User Says Thank You to 454 Rattler For This Useful Post:
Bobs36ford (09-26-2012)
  #5 (permalink)  
Old 09-24-2012, 02:04 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 51
Posts: 1,725
Wiki Edits: 0

Thanks: 8
Thanked 40 Times in 37 Posts
Check the manual lever seal and the accumulator.... Both are common leaks and when they do it can look like a pan leaking.
Reply With Quote Quick reply to this message
The Following User Says Thank You to prostreet6t9 For This Useful Post:
Bobs36ford (09-26-2012)
  #6 (permalink)  
Old 09-24-2012, 08:02 PM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,126
Wiki Edits: 1

Thanks: 0
Thanked 29 Times in 19 Posts
I went thru the same problem/. I also changed to alum pan and provided gasket. I torqued it properly. Do not over tighten. Next common leak is dipstick tube. Be sure you havre the correct tube for the tranny. It will take either an "O" ring or the top hat plastic type. Be sure your dipstick tube is supported and be sure it is in the correct position. This can be a tuff one to find as the kick down cable is near the dipstick hole and it can leak also.
The speedometer hookup is another culprit and on mine I finally figured out that the brand new driven gear was letting fluid past it. You can get a new bullet to with a new "O" ring for it.
And lastly on my tranny filling it to the full mark was to much fluid. I let it run a little lower and it is better.
All these places leaked on mine after a rebuild. I would go for a cruise and come back and crawl under and look to see where the leak was.
Plus of course I had to wipe everything off . , . Finally got them all.
Reply With Quote Quick reply to this message
The Following User Says Thank You to Cape Cod Bob For This Useful Post:
Bobs36ford (09-26-2012)
  #7 (permalink)  
Old 09-24-2012, 09:24 PM
Registered User
 
Join Date: Jan 2008
Location: Washington State
Posts: 107
Wiki Edits: 0

Thanks: 4
Thanked 1 Time in 1 Post
transmission leak

What is the correct torque on the TH 350 transmission? Mine also leaks just a bit.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-24-2012, 10:30 PM
Registered User
 
Join Date: Sep 2012
Posts: 69
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
is this the same one that had a vibration ?sounds like the pump seal and bushing might be shot
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 09-24-2012, 11:20 PM
Registered User
 
Join Date: Jan 2008
Location: Washington State
Posts: 107
Wiki Edits: 0

Thanks: 4
Thanked 1 Time in 1 Post
Transmission Leak

Not the same. Mine just leaves a few drops on the garage floor and I thought I might not be torquing to the correct spec. Just want to know what the correct torque is for the TH 350 tranny pan bolts.
Rusty Duck
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 09-25-2012, 05:05 AM
Irelands child's Avatar
Registered User
 
Last wiki edit: Ford engine specifications Last photo:
Join Date: Jan 2005
Location: Upstate New York
Posts: 4,914
Wiki Edits: 8

Thanks: 14
Thanked 205 Times in 186 Posts
I have a Ford C4 and have gone through the pain. Transmission pan gaskets - cork leaks!!! There are several different kinds of fiber gaskets plus at least one manufacturer that supplies a steel in rubber version Moroso 93102 - Moroso Transmission Pan Gaskets - Overview - SummitRacing.com and not inexpensive, but they work. Those pan bolts - if they are conventional bolts and washers without an integral washer( flange head * ) - they leak. I'm using them as well as sealing washers** at 12 lb ft of torque. These DO NOT leak. Then there are Lokar dipsticks - the ones with a single 'O' ring can leak a lot. The 'improved' double 'O' ring version will leak less - Lokar uses the wrong diameter 'O' ring, at least for my C4. Lokar will either repair or replace that single ring dipstick for the price of postage one way - they sent me a new one. I'm now using a locking Hughes dipstick which has a GM type seal that does not leak.

* Flange head - McMaster-Carr

** Sealing washers - McMaster-Carr

As far as pans - all pans are not the same - I went through 3 new stamped steel, including a NOS Ford and now have a Trick Flow aluminum version where the bolt holes wont bend out of shape at normal torque tightness - here's one for the TH350 Trick Flow Specialties Automatic Transmission Pans - TH350 Transmission Type - Search Results for transmission pans - SummitRacing.com

Did the leak stop? No but it went from a pretty good sized puddle in 3-4 weeks to a couple of spots and my guess is that I have a minor seal leak.

Did I say that I went through the pain with the pans????

Dave W

PS: If this fails, there are bigger problems with that transmission - seals, cracks (tailshaft with a TH350 seems to be not uncommon')
__________________
Irelands child
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 09-25-2012, 10:07 AM
Registered User
 
Join Date: Jan 2008
Location: Washington State
Posts: 107
Wiki Edits: 0

Thanks: 4
Thanked 1 Time in 1 Post
transmission leak

thank you for your reply. maybe a couple of drops over several weeks is not enough to worry about. I'll re-torque to 12 lbs and see what happens.
Rusty Duck
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 09-25-2012, 05:58 PM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,126
Wiki Edits: 1

Thanks: 0
Thanked 29 Times in 19 Posts
Quote:
Originally Posted by rusty duck View Post
What is the correct torque on the TH 350 transmission? Mine also leaks just a bit.
Haynes says 10 ft.lbs.
Reply With Quote Quick reply to this message
The Following User Says Thank You to Cape Cod Bob For This Useful Post:
rusty duck (09-26-2012)
  #13 (permalink)  
Old 09-25-2012, 06:31 PM
Registered User
 
Join Date: Sep 2012
Posts: 69
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
It might be opinion but i have had great luck with the cork style gaskets
I use a t handle and retighten them when its hot and usually that seals them all
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 09-26-2012, 01:32 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
X2 on the retighten/retorque. 2-3 times is usually needed. Some Trans pan holes go into the fluid at the bracket mount area & sealant is needed on the threads.
Cork is best for stock Pans with raised bead flange.
Duraprene is also great, they're reusable.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 09-26-2012, 05:44 AM
Registered User
 
Join Date: Sep 2012
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Try to avoid cork gaskets if at all possible. Most are synthetic cork and fluid will bleed through the material itself.

Maybe the problem is not the gasket at all. It could be a torque converter seal leaking, dipstick tube, or cooler line fitting. This can easily be assumed to be a pan gasket leak.
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
Transmission leak Wildwestshow Transmission - Rearend 1 11-05-2010 04:48 PM
transmission leak: paulie64 Transmission - Rearend 5 10-07-2008 03:39 PM
Transmission Leak EazyDuzIt102 Transmission - Rearend 5 08-13-2006 07:18 PM
transmission leak camay7 Transmission - Rearend 3 07-27-2004 09:20 AM
c4 transmission leak 67mustang Transmission - Rearend 2 11-12-2003 10:09 PM


All times are GMT -6. The time now is 05:37 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.