Where the f*ck is my tranny leaking from - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1974ChevyC10 · 12-05-2002, 05:33 AM

my tranny is leaking....not all that bad but enough to piss me off.i replaced the pan gasket and filter about 7 months ago and it still leaks.i think it might be the seal for the dipstick tube or the pan gasket may have blown.any ideas as this leak is beginning to annoy the hell out of me.

Prerunner1982 · 12-05-2002, 06:14 AM

try speedo cable connection?

Razorback_Fan · 12-05-2002, 07:35 AM

I had the same problem and finally traced it to being the tranny tube (dipstick holder). It was cracked about half way up took me forever to find it. Good luck!!!!

79BIG10 · 12-05-2002, 02:04 PM

Is the pan lip bent any? I would also check the speedo cablr connection.

Tom · 12-05-2002, 03:33 PM

I know your pain Jim. first leak on my th350 was the dipstick tueb. Every time I poured in more fluid some would drain onto the ground. Turns out the tube was resting on the exaust manifold and had burned a hole in it.
Leak #2- detent cable housing was broke, and it leaked out from there all the time
Leak #3- dipstick tube gasket
Leak #4- I have no idea why or where this one came from. Everything was tightend down, new gaskets EVERYWHERE, and still it dripped. It looked like it was just soaking threw the pan gasket.

1974ChevyC10 · 12-05-2002, 04:09 PM

all good suggestions guys.....the leak i noticed last night when i was leaving work appears to be coming from both the front of the pan and right passenger side of the tranny.the pan being bent at the lip also crossed my mind.the dipstick tube could also be a culprit.im not sure about the speedo cable connection but ill check that.i guess i know what im doing next weekend....im moving this weekend.....ugh i hate moving....anyone wanna come do it for me lol

Slonaker · 12-05-2002, 06:48 PM

I have been fighting some leaks on my TH-350 for the last several weeks. I kept going back and forth between NAPA and the house trying to match up parts. I would suggest that you just buy a complete seal kit for it. I bought mine at a transmission shop for about $20, but NAPA told me they only get $22 for it. It will save you a lot of trips to the parts store, and you'll probably end up using many of the parts eventually anyway.

Slonaker

bigblock73 · 12-05-2002, 11:40 PM

sounds like the dipstick O-ring to me from the location it is coming from.

Had the same problem!

-Jeff

Capitol68 · 12-06-2002, 12:03 PM

that happened to me, i replaced the pan gasket like 3 times, saying ok,,,ill make sure all surfaces are clean and pan straight..still happened......it ended up being from a large diam.round piece( 3 in ) ? on passenfer side...never leaked agian

*mike reeh* · 12-07-2002, 01:23 PM

mine leaks a little from the shifter seal, might check that out

mike

12-05-2002, 05:33 AM	#1
1974ChevyC10 Overworked and Underlaid Join Date: May 2002 Location: Flagstaff,Arizona Posts: 1,279	*Where the fck is my tranny leaking from** my tranny is leaking....not all that bad but enough to piss me off.i replaced the pan gasket and filter about 7 months ago and it still leaks.i think it might be the seal for the dipstick tube or the pan gasket may have blown.any ideas as this leak is beginning to annoy the hell out of me. __________________ I'd rather push a Chevy than drive a Ford The Beast-1978 C10 LWB Red-1978 C10 LWB (Uncle Mike)Michael Henry Millett 11/5/1957 to 03/08/2012 Gone but will never be forgotten-RIP (Uncle Chuck)Charles Manning Gulbronsen Sr 1956-2012 Taken from us to soon but you will live on in our hearts-RIP

12-05-2002, 03:33 PM	#5
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	I know your pain Jim. first leak on my th350 was the dipstick tueb. Every time I poured in more fluid some would drain onto the ground. Turns out the tube was resting on the exaust manifold and had burned a hole in it. Leak #2- detent cable housing was broke, and it leaked out from there all the time Leak #3- dipstick tube gasket Leak #4- I have no idea why or where this one came from. Everything was tightend down, new gaskets EVERYWHERE, and still it dripped. It looked like it was just soaking threw the pan gasket. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

12-05-2002, 04:09 PM	#6
1974ChevyC10 Overworked and Underlaid Join Date: May 2002 Location: Flagstaff,Arizona Posts: 1,279	all good suggestions guys.....the leak i noticed last night when i was leaving work appears to be coming from both the front of the pan and right passenger side of the tranny.the pan being bent at the lip also crossed my mind.the dipstick tube could also be a culprit.im not sure about the speedo cable connection but ill check that.i guess i know what im doing next weekend....im moving this weekend.....ugh i hate moving....anyone wanna come do it for me lol __________________ I'd rather push a Chevy than drive a Ford The Beast-1978 C10 LWB Red-1978 C10 LWB (Uncle Mike)Michael Henry Millett 11/5/1957 to 03/08/2012 Gone but will never be forgotten-RIP (Uncle Chuck)Charles Manning Gulbronsen Sr 1956-2012 Taken from us to soon but you will live on in our hearts-RIP

12-05-2002, 06:48 PM	#7
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	I have been fighting some leaks on my TH-350 for the last several weeks. I kept going back and forth between NAPA and the house trying to match up parts. I would suggest that you just buy a complete seal kit for it. I bought mine at a transmission shop for about $20, but NAPA told me they only get $22 for it. It will save you a lot of trips to the parts store, and you'll probably end up using many of the parts eventually anyway. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

12-06-2002, 12:03 PM	#9
Capitol68 Registered User Join Date: Sep 2002 Location: Austin,Tx Posts: 327	that happened to me, i replaced the pan gasket like 3 times, saying ok,,,ill make sure all surfaces are clean and pan straight..still happened......it ended up being from a large diam.round piece( 3 in ) ? on passenfer side...never leaked agian __________________ '68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851

12-05-2002, 06:14 AM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	try speedo cable connection? __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

12-05-2002, 07:35 AM	#3
Razorback_Fan Registered User Join Date: Nov 2002 Location: Katy Tx Posts: 188	I had the same problem and finally traced it to being the tranny tube (dipstick holder). It was cracked about half way up took me forever to find it. Good luck!!!!

12-05-2002, 02:04 PM	#4
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Is the pan lip bent any? I would also check the speedo cablr connection. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

12-05-2002, 11:40 PM	#8
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	sounds like the dipstick O-ring to me from the location it is coming from. Had the same problem! -Jeff

12-07-2002, 01:23 PM	#10
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	mine leaks a little from the shifter seal, might check that out mike

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