How do I stop 700R Transmission from leaking at tail end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jcloud6 · 11-01-2010, 03:13 PM

I have replaced the rear bearing and seals in my 700R Transmission, by the next weekend its again. could it be the wrong drive shaft yoke because there is a little play after installing new tail shaft bearing?

RandyP · 11-01-2010, 03:59 PM

Mines the same way, drives me nuts having a leak like that. I'm at the point where I'm just going to wait and have it rebuilt once it starts slipping a bit more.

Jonboy · 11-01-2010, 04:48 PM

Pull the driveshaft out, and put a small piece of cardboard in the end of the yoke, small enough that it will stay in the end of the yoke. The tailshaft is leaking out of the hole in the output shaft. The cardboard will help stop the leak.

87chevy.com · 11-01-2010, 09:16 PM

Quote:

Originally Posted by Jonboy

Pull the driveshaft out, and put a small piece of cardboard in the end of the yoke, small enough that it will stay in the end of the yoke. The tailshaft is leaking out of the hole in the output shaft. The cardboard will help stop the leak.

just wondering.... but is it over filled? is that why it leaks out of the output shaft? Whats the purpose of having a hole in the yoke?

Slonaker · 11-02-2010, 10:23 AM

Could this be your problem?

http://73-87.com/7387garage/drivetrain/yokeleak.htm

I had the same problem with my TH350C. I fixed it tempoaraily by cleaning the hole with brake cleaner, then using the tip of a screwdriver to dab some RTV on it. Later on, I bought the correct o-rings for it, and the problem, went away.

Slonaker

**PRattenbury** · 11-02-2010, 02:18 PM

Weld the hole in the yoke shut.

82chevy350 · 11-02-2010, 02:51 PM

thats what i did on my t350 i just welded the hole shut

silvereagle07 · 11-02-2010, 03:30 PM

You can put axle grease on the splines to slow it down. If you close the hole it will cause the suction in the yoke and not allow it to move freely. The hole is there to vent the air between the output shaft and yoke.

Ceeten · 11-02-2010, 07:45 PM

Output shaft o-ring. Trans shop should have them laying around. About a 5 minute fix.

bucannon · 11-03-2010, 04:22 AM

Quote:

Originally Posted by Ceeten

Output shaft o-ring. Trans shop should have them laying around. About a 5 minute fix.

x2

**PRattenbury** · 11-03-2010, 06:48 AM

Sometimes they just don't seal. And you need to weld it shut.

11-01-2010, 03:13 PM	#1
jcloud6 Registered User Join Date: Oct 2010 Location: Clarksville, TN Posts: 37	How do I stop 700R Transmission from leaking at tail end I have replaced the rear bearing and seals in my 700R Transmission, by the next weekend its again. could it be the wrong drive shaft yoke because there is a little play after installing new tail shaft bearing? Last edited by jcloud6; 11-01-2010 at 03:19 PM. Reason: misspelled word

11-01-2010, 03:59 PM	#2
RandyP Getting Old; Going Broke Join Date: Apr 2010 Location: Owasso OK Posts: 2,764	Re: How do I stop 700R Transmission from leaking at tail end Mines the same way, drives me nuts having a leak like that. I'm at the point where I'm just going to wait and have it rebuilt once it starts slipping a bit more. __________________ *Why is every used 350 sbc out of a corvette?* There's only two things that excite a man, expensive toys and real expensive toys. *VEGETARIAN: That's an old Indian word meaning "I don't hunt so good."* When the going gets tough, switch to power tools.

11-01-2010, 04:48 PM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: How do I stop 700R Transmission from leaking at tail end Pull the driveshaft out, and put a small piece of cardboard in the end of the yoke, small enough that it will stay in the end of the yoke. The tailshaft is leaking out of the hole in the output shaft. The cardboard will help stop the leak. __________________ 1974 Jimmy- 5.3/4L80e/NP241

11-02-2010, 10:23 AM	#5
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: How do I stop 700R Transmission from leaking at tail end Could this be your problem? http://73-87.com/7387garage/drivetrain/yokeleak.htm I had the same problem with my TH350C. I fixed it tempoaraily by cleaning the hole with brake cleaner, then using the tip of a screwdriver to dab some RTV on it. Later on, I bought the correct o-rings for it, and the problem, went away. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

11-02-2010, 02:18 PM	#6
PRattenbury Senior Member Join Date: Feb 2010 Location: Maumelle, AR Posts: 478	Re: How do I stop 700R Transmission from leaking at tail end Weld the hole in the yoke shut.

11-02-2010, 02:51 PM	#7
82chevy350 Registered User Join Date: Sep 2009 Location: Van Buren, AR Posts: 321	Re: How do I stop 700R Transmission from leaking at tail end thats what i did on my t350 i just welded the hole shut __________________ Drive It Like Ya Stole It '82 Primer White c10 2wd LWB 350 sbc t350 (Hot Rod) '90 2wd LWB Silverado 350 tbi 700R4 (Daily Driver) '53 m38a1 Willys Jeep (Toy)

11-02-2010, 03:30 PM	#8
silvereagle07 Registered User Join Date: Sep 2008 Location: Bailey, NC Posts: 2,462	Re: How do I stop 700R Transmission from leaking at tail end You can put axle grease on the splines to slow it down. If you close the hole it will cause the suction in the yoke and not allow it to move freely. The hole is there to vent the air between the output shaft and yoke. __________________ Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT

11-02-2010, 07:45 PM	#9
Ceeten Registered User Join Date: Oct 2009 Location: Jay, Fl Posts: 126	Re: How do I stop 700R Transmission from leaking at tail end Output shaft o-ring. Trans shop should have them laying around. About a 5 minute fix.

11-03-2010, 06:48 AM	#11
PRattenbury Senior Member Join Date: Feb 2010 Location: Maumelle, AR Posts: 478	Re: How do I stop 700R Transmission from leaking at tail end Sometimes they just don't seal. And you need to weld it shut.



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