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#1 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Odd tranny leak
I need help diagnosing an odd tranny leak. When I drove it every day, there was no evidence of a leak. If it sits for 2 or more days, it leaks. It's been sitting for 10 days, to take it apart and do some body work, and now has leaked quite a bit. Any ideas what it could be and cost to fix?
Thanks, -Mark
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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#2 |
Registered User
![]() Join Date: Dec 2006
Location: CA
Posts: 331
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Re: Odd tranny leak
I'll be watching this thread too. Same exact problem. Mine's a Turbo 350 on a 4 X 4.
I can't tell if it's the pan or the rear seal? |
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#3 |
Registered User
Join Date: Apr 2007
Location: Roselawn, Indiana
Posts: 60
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Re: Odd tranny leak
Check the dipstick tube where it goes into the trans. I have seen that puppy drive guys mad. There is a rubber o-ring at the base of the tube and that may be shrunk or cracked. When the truck sits for extended periods of time fluid starts to drain back into the pan (what would normal remain in the convertor and valve body) and pushes the fluid level up so that it actualy leaks out there. same goes for the vacum modulator if yours is equipped, or possiably the pan.
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#4 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Re: Odd tranny leak
I hope it's the dipstick o-ring. The tranny was rebuilt prior to my purchasing the truck in Feb. I could use a fix that's easy and cheap!
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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#5 |
Registered User
Join Date: Sep 2006
Location: League City, Texas
Posts: 732
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Re: Odd tranny leak
Don't forget the selector shaft seal too. I think that is where mine is leaking after it sits for a while.
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#6 | |
Living In The Past
Join Date: Nov 2003
Location: Rockies
Posts: 709
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Re: Odd tranny leak
Quote:
About the dipstick tube. You guys with leaks there ought to go get the updated version (tube) that uses a big boot seal instead of the o ring. That o ring can break too easy. Last edited by Olden Days; 05-08-2007 at 11:08 AM. |
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#7 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: Odd tranny leak
I learned - at least I think I did something. The instructions on my new converter discussed fluid level at length. The are of the opinion that most trannys are over full. leave the fluid when warm at the bottom of the cross hatched area on your dip stick tube. They seem to indicate much the same as above that the fluid can drain back different amounts based upon in what place the converter stops. Ditto on the Oring - the fit on aftermarket dip sticks is not great to begin with. I have been trying to make an addtional sleeve that would allow an extra level of sealing. I have even thought about going and getting another crimp put into the tube to allow for dual O rings. The factory design leaves some room for improvment!
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1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
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#8 |
Registered User
Join Date: Jul 2006
Location: Twin Cities, MN
Posts: 115
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Re: Odd tranny leak
I had the exact same problem on my reman'ed TH350 with less than 40 miles on it. It turned out to be the kickdown cable leaking. I was missing the rubber o-ring on the end that fits into the transmission. I went to the transmission shop and was told there are two types of o-rings - one is a standard o-ring and the other is a boot style sleeve (looks like a top hat) o-ring. The transmission guy gave me the o-rings for no cost
![]() I also replaced the cheap chrome B&M tranny pan with drain bolt. I went to the dealer and purchased a completely stock transmission pan with no drain bolt. Hope this helps.
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__________________________________ 1971 GMC Stepside 350HO Deluxe 330hp, TH350 w/Gear Vendors, 3.73 Eaton posi, Fitech EFI, Boyd's Welding Tank, Ridler wheels, ECE 4/6" drop, front/rear sway bar ________________________________ |
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#9 |
Sandwich: Club
Join Date: Mar 2006
Location: Houston, TX
Posts: 119
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Re: Odd tranny leak
I'm another one with this problem....I figured that my truck got nervous when I didn't drive her for awhile so she would puke all over the garage floor....
I've replaced the selector seal and the pan gasket....guess the dipstick tube seal and kickdown cable are next. Does the dipstick tube just pull out of the housing to allow replacement of the seal? |
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#10 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Odd tranny leak
My CST with a TH350 does the same thing....???? Should the level be checked in neutral or park...or does it matter? I had a 1998 Dodge that was 2 quarts different on the dipstick between neutral and park.
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#11 |
Registered User
Join Date: Apr 2007
Location: muskogee, ok
Posts: 32
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Re: Odd tranny leak
Dodges check in neutral; CHEVYS (rule) check in park. Fluid should be between the cold and hot, with engine at operating temp. Dipstick tube probably has a tang welded to it that attaches under on of the bell housing bolts, kinda hard to get at. Remove the bolt, tube just pulls out. Replace O-ring, remember to smear some fluid on it so it goes in without binding. Luck.
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#12 | |
Registered User
Join Date: Apr 2007
Location: Visalia, CA.
Posts: 327
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Re: Odd tranny leak
Quote:
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