6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > Transmissions and Rear Ends


Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

Reply
 
Thread Tools
  #1  
Old December 12th, 2016, 10:37 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 173
Rep Power: 88
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Leak... Tips?

So, it looks like I've got a transmission leak. I think I've identified where it's coming from (I've attached a picture of the offending bolt).
My question is it doesn't look like something with a rubber washer. So, how do I stop the leak? Torque it and see if that works? Or is there something I'm not seeing?


Also, I can't see an easy way to top it up. But, the manual speaks of a 'filler plug'. Surely that can't be the bolt with the red dot in the following photo. How is one supposed to get anything in there? Lol



Sent from my E6653 using Tapatalk
Reply With Quote
  #2  
Old December 12th, 2016, 03:16 PM
FetchMeAPepsi's Avatar
FetchMeAPepsi FetchMeAPepsi is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Edmond, Ks
Truck: 1962 4x4 GMC CECILIA
Posts: 1,337
Rep Power: 365
FetchMeAPepsi is on a distinguished road
Default Re: Leak... Tips?

That leak could be the speedometer cable or the bolts on tail piece. You might get lucky and be able to snug them up to get it to stop. Someone will chime in with the ft-lbs to torque them to. I just did mine good and snug.

That fill plug isn't as hard as it looks. You can get this thing and it'll pump all the oil you need then you can use it on other stuff too. It won't work on gasoline though. Ask me how I know haha.
__________________
Step by steps:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
__________________
If the women don't find you handsome, they should at least find you handy.
Reply With Quote
  #3  
Old December 13th, 2016, 08:49 AM
AZKen AZKen is online now
-= Dues Paid =-
 
Join Date: Jul 2014
Location: State48
Truck: 1960 K1001 Wideside 305 BW Custom Cab
Posts: 792
Rep Power: 0
AZKen is infamous around these partsAZKen is infamous around these parts
Default Re: Leak... Tips?

As indicated by FMAP, you are seeing a leak from above somewhere and gravity is carrying it to the bottom of case. The most likely is the speedo connection as said. Follow the wet upwards to the offender. Any kingdof pump with a tube will do if it needs filling. Stick a pinky in hole and if wet, you are OK. Fill to level with hole or a hair below. Old trucks will have leaks. That seems like a small one. Keeps the roads oiled.
Reply With Quote
  #4  
Old December 13th, 2016, 10:17 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 173
Rep Power: 88
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Leak... Tips?

There's no wet above the bolt that I took a picture of. Also, I gave it a wipe and left it for a day and sure enough, the area around the bolt looks like the culprit. But, what I'm not sure of is how to fix something that looks like a metal on metal connection? Is there some kind of sealant that should be around the bolt?
Also, what is the name of the bolt? I've looked in the manual and there are a few different ones on the transmission (other than the obvious drain plug and filler bolt).
I guess what I'm getting at is what's the proper name for the thing that I think is leaking?

Sent from my E6653 using Tapatalk
Reply With Quote
  #5  
Old December 13th, 2016, 10:19 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 173
Rep Power: 88
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Leak... Tips?

Quote:
Originally Posted by Jmclendon View Post
There's no wet above the bolt that I took a picture of. Also, I gave it a wipe and left it for a day and sure enough, the area around the bolt looks like the culprit. But, what I'm not sure of is how to fix something that looks like a metal on metal connection? Is there some kind of sealant that should be around the bolt?
Also, what is the name of the bolt? I've looked in the manual and there are a few different ones on the transmission (other than the obvious drain plug and filler bolt).
I guess what I'm getting at is what's the proper name for the thing that I think is leaking?

Sent from my E6653 using Tapatalk
Speedo cable looking dry


That bolt is still a leakin'


Sent from my E6653 using Tapatalk
Reply With Quote
  #6  
Old December 13th, 2016, 03:55 PM
FetchMeAPepsi's Avatar
FetchMeAPepsi FetchMeAPepsi is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Edmond, Ks
Truck: 1962 4x4 GMC CECILIA
Posts: 1,337
Rep Power: 365
FetchMeAPepsi is on a distinguished road
Default Re: Leak... Tips?

There's a little paper filter about the width of the back of a blister pack that goes in there to keep it from leaking. I'm pretty sure if you give it a quarter twist (and all the other ones that may be loose) it'll seal back up.

If you want to do a full repair look in my thread about rebuilding the transmission. I go through everything step by step. You can skip to the tailshaft portion but it will involve the bearings, which can be fun to get back in there. And you'll want a ring spreader thing like this

http://www.ebay.com/itm/LOCKING-RING...gAAMXQQQZRzoYL


I used two screwdrivers (flathead) the first time I did it and it was TOUGH. With the spreader you're done immediately.
__________________
Step by steps:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
__________________
If the women don't find you handsome, they should at least find you handy.
Reply With Quote
  #7  
Old December 13th, 2016, 04:04 PM
bobdylan bobdylan is online now
Senior Member
 
Join Date: Mar 2015
Location: mclouth kansas
Truck: 64 Gmc suburbann 305e, 4speed. v12 truck engine, v12 irrigation,2-305e,305a,305d
Age: 61
Posts: 365
Rep Power: 111
bobdylan is on a distinguished road
Default Re: Leak... Tips?

Tear out your concrete driveway and leave it gravel. Makes all your old trucks seem like they are not leaking as much.
What weight gear oil are you running?
Reply With Quote
  #8  
Old December 13th, 2016, 04:58 PM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,257
Rep Power: 333
TJ's GMC is on a distinguished road
Default Re: Leak... Tips?

Easiest way I found to top that trans off was to take the stick out and fill it from the top. Pull the filler plug out and have someone watch so you don't over fill. Worked well for me. Like FMAP said, give them all a good snug and see if that helps. I'm not sure what Cover that is under the manual without reading deeply, but it looks like spec is 20-25 foot pounds. Someone chime in if I am wrong.
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #9  
Old December 13th, 2016, 11:10 PM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 173
Rep Power: 88
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Leak... Tips?

Quote:
Originally Posted by FetchMeAPepsi View Post
There's a little paper filter about the width of the back of a blister pack that goes in there to keep it from leaking. I'm pretty sure if you give it a quarter twist (and all the other ones that may be loose) it'll seal back up.
There's no quarter twist to be had. If anything, I think the dude that worked on it last time must've taken the "tighten the crap out of everything approach."

Could that be what's caused the problem? If something is over-tight, I'm guessing it wouldn't take much to crush the filter that you're talking about?

Will the transmission have to come out in order to fix this? Or is it worth loosening to spec and adding some lucas oil in the hopes that the gasket/filter comes good?
Reply With Quote
  #10  
Old December 13th, 2016, 11:19 PM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 173
Rep Power: 88
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Leak... Tips?

Quote:
Originally Posted by bobdylan View Post
Tear out your concrete driveway and leave it gravel. Makes all your old trucks seem like they are not leaking as much.
Love it LOL

Not sure the owners of the place would like that. Particularly since it would mean replacing the garage floor with gravel also. At the moment I've taken to making sure there's a sheet of plastic under it when I park.

Quote:
Originally Posted by bobdylan View Post
What weight gear oil are you running?
That's a good question. Unfortunately, I haven't the faintest idea. I sent the truck to a garage when I first got it.

Let's just say I've since decided that approach has some downsides. LOL

On a serious note though, the manual says that I should be using 'multi purpose gear oil' from memory I think. But I've not been able to find anything about the grade and whatnot that I should be running. Thoughts?
Reply With Quote
Reply

Bookmarks

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
More Transmission Installation Tips Archiver Previous Forum Posts 0 October 18th, 2007 02:27 AM
Re: Tips and info Archiver Previous Forum Posts 0 April 16th, 2005 02:14 AM
Tips and info Archiver Previous Forum Posts 0 April 15th, 2005 02:17 AM
Re: Starting tips Archiver Previous Forum Posts 0 June 16th, 2004 02:23 AM
Starting tips Archiver Previous Forum Posts 0 June 15th, 2004 03:17 PM


All times are GMT +1. The time now is 11:24 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 104|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.