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 > All 4x4 Tech & Off Roading

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-07-2011, 06:15 PM   #1
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
guys i really need your help if you know how to help me and my dad please reply

okay today i go out side and notice i the battery is dead on my dads 1970 chevy lwb 1/2 ton because my mom left the lights on so i put it in nuetral and move it so i can pull my truck out of the garage to clean it , and when i move it i notice there was about a pint of tranny fluid on the ground! so i look at the tranny fluid its says''add" well i go under and wipet the tranny Xmember clean and wacth it after about 5 mins there is already 5 spots were tranny fluid is dripping again what do we do? what is wrong?
67chevy1series is offline   Reply With Quote
Old 02-07-2011, 06:36 PM   #2
csb#356
Registered User
 
Join Date: May 2009
Location: Spokane WA
Posts: 308
Re: guys i really need your help if you know how to help me and my dad please reply

Where's it look like its coming from, Front, back, pan, dipstick. Need more info. I'm assuming its a 4x4
csb#356 is offline   Reply With Quote
Old 02-07-2011, 06:42 PM   #3
chevy_mike
Never Ending Projects
 
chevy_mike's Avatar
 
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,835
Re: guys i really need your help if you know how to help me and my dad please reply

You likely have a seal that is bad and when it sits the converter is draining back, which will raise the fluid level higher then the seal that is leaking. It then drains thru that seal until the fluid level is below that point.

As for which seal, it can be any number of ones but a really common one is the o-ring on the dipstick where it comes into the trans case. It can be a real output seal, selector shaft seal, pan gasket, etc. You really need to find out where the fluid is dripping/leaking from to know what to fix.

Also, you are checking the fluid while it is running, after cycling thru all the gear selections and putting it back into Park, correct? Ideally you want to do this when it is hot as well. You can overfill the trans which can also cause it to leak.

Good luck.
__________________
.
1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD
1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD
1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD


We were given two ears and one mouth for a reason... listen twice as much and speak half as often...
chevy_mike is offline   Reply With Quote
Old 02-07-2011, 06:53 PM   #4
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

it is dripping from ?????? down to the tranny crossmember then onto the floor so anywhere above the crossmember....yes it is a 4wd 1/2 ton chevy stock height
67chevy1series is offline   Reply With Quote
Old 02-07-2011, 07:03 PM   #5
SeventyOne
Registered User
 
Join Date: Mar 2007
Location: Berkeley, Ca
Posts: 1,282
Re: guys i really need your help if you know how to help me and my dad please reply

If it's dripping onto the transmission/tcase crossmember it might be the rear seal or even the T-case. You're going to have to get under the truck with a flashlight and find where the leak is originating from - maybe even remove the trans tunnel/hump if it helps.

If you can't tell, clean everything up real well then let it sit and see where the new drips come from.
SeventyOne is offline   Reply With Quote
Old 02-07-2011, 08:43 PM   #6
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

thank you!
67chevy1series is offline   Reply With Quote
Old 02-07-2011, 09:25 PM   #7
Mike C
Registered User
 
Mike C's Avatar
 
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,467
Re: guys i really need your help if you know how to help me and my dad please reply

Some TH350s have a vent hole in the end of the trans yoke, and I guess an internal seal. This tends to leak after the truck has been parked for several days and is a pain to track down. Something else to look for.
__________________
44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
Mike C is offline   Reply With Quote
Old 02-07-2011, 10:24 PM   #8
kingburnett
Registered User
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 32
Re: guys i really need your help if you know how to help me and my dad please reply

Quote:
Originally Posted by SeventyOne View Post
If it's dripping onto the transmission/tcase crossmember it might be the rear seal or even the T-case. You're going to have to get under the truck with a flashlight and find where the leak is originating from - maybe even remove the trans tunnel/hump if it helps.

If you can't tell, clean everything up real well then let it sit and see where the new drips come from.
Like SeventyOne says clean and then put a piece of cardboard under to find the first drips. Also check any tubing lines especially at the end fittings. Be sure you are on level ground when topping off the fluid too.
__________________
I like More's Law 'If more is better, then too much is just right.'
http://s1238.photobucket.com/albums/...20chevy%20k10/
1971 Chevelle - sbc 350 TH350
1961 K10 - sbc 400 4 spd M/T short stepside

Last edited by kingburnett; 02-07-2011 at 10:25 PM.
kingburnett is offline   Reply With Quote
Old 02-07-2011, 11:05 PM   #9
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

thanks guys this is all good info and each of these will be tried we are gonna take it down to see what is wrong and if its easy we will fix it if not then we will jave it fixed
67chevy1series is offline   Reply With Quote
Old 02-08-2011, 12:19 AM   #10
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,202
Re: guys i really need your help if you know how to help me and my dad please reply

It's not leaking, it's just marking it's territory.

Or, like I tell the operators (drivers) at work. If you let it leak long enough, it will eventually stop.

Sounds like the problem can be fixed by simply installing a 700r-4

Seriously though,

you may want to wear some grungy clothes, bring a stiffer bristle brush like a dish washing brush and some dawn, take it to the car wash, and clean the padookie out of the tranny and t-case.

Now that all the grime is gone, you can watch a clean surface to see where the leak is coming from. Seals for the TH350 are cheap. It could be the pan seal, it could be the governor cover seal... both are easy to change. If you have a chrome pan, than that is whats leaking. Chrome makes shiny leaks. I have some really good tips for leak-proofing a tranny pan if you need them.
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 02-08-2011, 12:39 AM   #11
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

its not the pan he has a beautiful aluminum pan he said it has a ''pin'' that is sticking out and it looks like leaking on the upper right above the t case so he says what is it? he also says there is a line coming off of it?
67chevy1series is offline   Reply With Quote
Old 02-08-2011, 01:53 AM   #12
jbclassix
Junk Yartist
 
jbclassix's Avatar
 
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,202
Re: guys i really need your help if you know how to help me and my dad please reply

yeah if its an aluminum pan than its probably not leaking. I may be wrong, but you may be seeing the vacuum modulator seal leaking.
__________________
-Jeremy

YOU ONLY FAIL IF YOU STOP TRYING

70 Crew Cab Build Link

70 GMC Suburban 4X4 build thread

95 Yukon Daily Driver

Rebuilding an NP205
jbclassix is offline   Reply With Quote
Old 02-08-2011, 02:11 AM   #13
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

thanks jeremy its just wierd how it all of the sudden happened! to bad my 67 wasnt running it could take the place of my dads truck! with the help of your parts i will be alot closer!

Last edited by 67chevy1series; 02-08-2011 at 02:12 AM.
67chevy1series is offline   Reply With Quote
Old 02-08-2011, 03:30 AM   #14
plummen
Registered User
 
Join Date: Jan 2011
Location: louisville ne
Posts: 131
Re: guys i really need your help if you know how to help me and my dad please reply

tighten pan bolts while youre under there
plummen is offline   Reply With Quote
Old 02-08-2011, 02:08 PM   #15
SeventyOne
Registered User
 
Join Date: Mar 2007
Location: Berkeley, Ca
Posts: 1,282
Re: guys i really need your help if you know how to help me and my dad please reply

Quote:
Originally Posted by plummen View Post
tighten pan bolts while youre under there
Maybe not - if they are properly torqued tightening the bolts on that aluminum pan may cause problems. Just check the torque on it - but if it's not leaking why mess with it...
SeventyOne is offline   Reply With Quote
Old 02-08-2011, 03:56 PM   #16
plummen
Registered User
 
Join Date: Jan 2011
Location: louisville ne
Posts: 131
Re: guys i really need your help if you know how to help me and my dad please reply

aluminum pan on a turbo 350? very few 40 plus year old transmisions have pan bolts that are all tight,had a friends 60 chevy convertable in garage last spring that he hadnt driven in 2 years because somebody told him oil leak was being caused by bad rear rope seal on pan/crank.
turns out all the oil pan bolts were loose,i tightened everything up and he hasnt had a leak since.
sometimes simple repairs are the right answer

Last edited by plummen; 02-08-2011 at 03:57 PM.
plummen is offline   Reply With Quote
Old 02-08-2011, 05:01 PM   #17
SeventyOne
Registered User
 
Join Date: Mar 2007
Location: Berkeley, Ca
Posts: 1,282
Re: guys i really need your help if you know how to help me and my dad please reply

Quote:
Originally Posted by plummen View Post
aluminum pan on a turbo 350?
sometimes simple repairs are the right answer
He said aluminum pan...

You are right - start with the easy/cheap repairs and move on. Like I said though, check the torque on them rather than just tightening the bolts. Regardless, it doesn't sound like his leak is from the pan.
SeventyOne is offline   Reply With Quote
Old 02-08-2011, 10:47 PM   #18
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

well it was at the shop almost the hole day and now my dad is on his way to go get it back it was the tranny/t-case gasket ,it was 150 i think ,its prob. only 20 for the seal and the 130 is in labor ! it must be hard having to take off all of this stuff and then put it back together again.......
67chevy1series is offline   Reply With Quote
Old 02-09-2011, 01:52 AM   #19
OrrieG
Registered User
 
OrrieG's Avatar
 
Join Date: Jun 2006
Location: Idaho
Posts: 8,791
Re: guys i really need your help if you know how to help me and my dad please reply

$130 sounds fair to me considering you have to pull both drive lines, shift linkage, maybe move the exhaust, possibly cross member, horse the transfer out and back in. They weigh about 300# and do not have a good balance point so its a real wrestling match.
__________________
1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread
1964 Chevelle Malibu w/ 355-350TH (daily driver)
Helpful AD and TF Manual Site Old Car Manual Project
OrrieG is offline   Reply With Quote
Old 02-09-2011, 11:17 AM   #20
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,716
Re: guys i really need your help if you know how to help me and my dad please reply

exactly what i was thinking! they said they may have to take the tranny out....we are gonna get it toda turns out they werent done yesterday...
67chevy1series 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 01:36 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Copyright 1997-2020 67-72chevytrucks.com