drip drip drip goes the tranny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rocktriviagod · 04-14-2004, 05:56 PM

I know one of you out there will have a simple fix for this problem. My 78 Chev (350/350TH) leaks tranny fluid where the speedo cable goes into the trans. I replaced the O-ring but it didn't make much difference. Is there a particular procedure I should be following or better brand of 0-ring ????
Thanks!!

**swervin ervin** · 04-14-2004, 06:09 PM

I'm guessing you replaced the o ring on the sleeve. There is a seal on the speedo gear shaft too.

Slonaker · 04-14-2004, 06:21 PM

I was able to buy a whole new "bullet" with inner seal and outer o-ring for just a few dollars at a transmission supply place. That ought to fix your problem unless there is a rough spot on the gear or something that eats up seals.

Slonaker

rocktriviagod · 04-14-2004, 08:24 PM

Thanks for the ideas. I'll check with the trans shop..........

KShortell · 04-15-2004, 01:03 PM

Cool thread.

I've got the same problem-- minor, but annoying.

MylilBowTie · 04-15-2004, 02:27 PM

I just went to the HELP section and bought an assorted O-ring pack. Put one in that fit the best and all fixed. Mine didn't have one at all in there somehow.

LOHRTBT · 04-15-2004, 03:25 PM

Guys..its not an o-ring....its a gasket that looks more like a top hat that has its top cut out. Its harder plastic than an o ring also. Like 2 bux and a pita to put in....

MylilBowTie · 04-15-2004, 07:35 PM

got any pictures of it?

**swervin ervin** · 04-15-2004, 08:53 PM

Here's the seal I'm talking about. This is what my 700R4 uses. I'm guessing a 350 uses something similar.

LOHRTBT · 04-15-2004, 10:35 PM

Oh my bad guys...on the speedo mike is correct... I was thinkin about the kickdown cable.

Slonaker · 04-16-2004, 12:44 AM

These are for my TH350C. They are resting on the receipt, so you can see how cheap they were ($5.90 for the pair). I'll install them one of these days.

Speedo cable bullet with seal and o-ring preinstalled (side view) and new speedo gear:

Speedo bullet (end view of seal):

Damn! This cheap little camera takes good close-ups! The bullet in the pic above is only about 3/4 inch in diameter...

Slonaker

04-14-2004, 05:56 PM	#1
rocktriviagod Registered User Join Date: Jan 2004 Location: Holmen, WI Posts: 50	drip drip drip goes the tranny I know one of you out there will have a simple fix for this problem. My 78 Chev (350/350TH) leaks tranny fluid where the speedo cable goes into the trans. I replaced the O-ring but it didn't make much difference. Is there a particular procedure I should be following or better brand of 0-ring ???? Thanks!! __________________ Currently in and around my garage: 1978 Chevy Stepside (Elvis) 1993 Chev S10 ext cab (LittleTruck) 1998 Chev Astro Van (Wife's Hauler) 2001 Honda 1500 Valkyrie Interstate (dad's toy) 2003 Honda 1800 Gold Wing (mom's toy)

04-14-2004, 06:09 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	I'm guessing you replaced the o ring on the sleeve. There is a seal on the speedo gear shaft too. __________________ Mike 1985 Chevy C-10

04-14-2004, 06:21 PM	#3
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	I was able to buy a whole new "bullet" with inner seal and outer o-ring for just a few dollars at a transmission supply place. That ought to fix your problem unless there is a rough spot on the gear or something that eats up seals. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

04-14-2004, 08:24 PM	#4
rocktriviagod Registered User Join Date: Jan 2004 Location: Holmen, WI Posts: 50	Thanks for the ideas. I'll check with the trans shop.......... __________________ Currently in and around my garage: 1978 Chevy Stepside (Elvis) 1993 Chev S10 ext cab (LittleTruck) 1998 Chev Astro Van (Wife's Hauler) 2001 Honda 1500 Valkyrie Interstate (dad's toy) 2003 Honda 1800 Gold Wing (mom's toy)

04-15-2004, 01:03 PM	#5
KShortell Registered User Join Date: Oct 2003 Location: Chesapeake, VA Posts: 726	Cool thread. I've got the same problem-- minor, but annoying. __________________ Semper Paratus

04-15-2004, 02:27 PM	#6
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	I just went to the HELP section and bought an assorted O-ring pack. Put one in that fit the best and all fixed. Mine didn't have one at all in there somehow. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

04-15-2004, 03:25 PM	#7
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Guys..its not an o-ring....its a gasket that looks more like a top hat that has its top cut out. Its harder plastic than an o ring also. Like 2 bux and a pita to put in.... __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

04-15-2004, 07:35 PM	#8
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	got any pictures of it? __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

04-15-2004, 08:53 PM	#9
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Here's the seal I'm talking about. This is what my 700R4 uses. I'm guessing a 350 uses something similar.

04-15-2004, 10:35 PM	#10
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Oh my bad guys...on the speedo mike is correct... I was thinkin about the kickdown cable. __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

04-16-2004, 12:44 AM	#11
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	These are for my TH350C. They are resting on the receipt, so you can see how cheap they were ($5.90 for the pair). I'll install them one of these days. Speedo cable bullet with seal and o-ring preinstalled (side view) and new speedo gear: Speedo bullet (end view of seal): Damn! This cheap little camera takes good close-ups! The bullet in the pic above is only about 3/4 inch in diameter... Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado Last edited by Slonaker; 04-16-2004 at 12:47 AM.



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