OK.. Been working on the '49 and seems my ****** doesn't like fluid. I'll admit I probably overfilled.. but heard that it's ok.. it'll just drain out the breather.. no biggie. Well everything has been just ducky for about 2 weeks now. Worked on it the other day.. installed a speedo cable (didn't have one before and had this funky ratio reducer on it).. other than doing that and jacking it up really haven't done anything else. Came into the shop yesterday and I could smell fluid. Bent down looked underneath and wa-la.. a river of ****** fluid on the ground. What am I missing here.. can't tell where all that fluid came from. Is there suppose to be some kind of a seal.. or O-ring between the speedometer cable and the ******? Fluid doesn't seem to be leaking from the pan or the back of the slip yoke area. Perrrr plexed.
it can be coming from the servo cover on the right side if the gasket is knicked, kickdown housing seal, dipstick tube seal, speedo cable housing, manual shaft seal, convertor seal, governor cover (doubtful but possible).
if its over full, probably out the vent. and no..its not ok for them to be run when over full...think of them as a big hydraulic pump..the internal seals and such will not like being used in an over full condition.. with it crying all over your floor, its trying to tell you something
there is a seal in the speedometer gear sleve, and an oring on the outside of the sleeve. When teh converter drains back into the pan, the fluid level will go up quite a bit. They also tend to leak at the shifter seal and kickdown cable when this happens.
Get the fluid level to where it is suppose to be. Then run the engine with the car in Park and see if it still leaks. If no leaks, then drive the car and see if it leaks after driving it. If so, chances are the ac***ulator cover o-ring on the p***enger side of the transmission is bad.
Hmmm, mine didn't, then when being driven it leaked like hell! Guess it could leak if really bad in Park.
Where did you get the idea that it was okay to overfill a trannie?The vent is just that,not a overfill gauge. How many quarts of fluid did you put in?
I've been driving this '66 Chevy truck daily for about 13 years & it has a TH-350 that always leaked. How long the ****** was in it before I got it is a mystery. The leaking really started to get out of hand. When he had it on the lift, I asked the guy that has been doing the yearly inspections where exactly he thought it was leaking? His answer was "Everywhere" & suggested that I just keep a good supply of cardboard on hand. Well, I ended up taking it to a trans guy that works out of his home & he did the following (according to the old receipt I'm looking at): replace rear seal, extension housing bushing & gasket, governor (I think that's what it says) cover gasket, linkage seal, fill tube O-ring (I know it was leaking from there quite a bit), pan gasket & filter & bottom vacuum hose by modulator. It cost me $225.00. It does not leak a drop anymore. Now, I can only see engine oil on the ground.
Sounds like he covered all the external seals and gaskets, EXCEPT for the front pump seal! When that goes you will have transmission fluid all over the place! Guess he didn't want to remove the transmission and fully seal it up.
My new to me 50 chevy leaks from the kick-down cable when it sits for more than 3 days. I'm told there is leak-back from worn torque converter bushing and that the fluid should never be that high cold. The fluid gets very high on the stick when it has been sitting. Replaced shift lever seal, pan gasket and added drain-back check valve. Fixed all the previous leak points except the kick down. Still gets too high. Seems to work OK so will replace kick-down seal and try to nurse it along till I can find a 200R4 for it.
don't mean to scare ya,but my leaky th350 turned out to be a cracked case. found to be common with too much pump pressure...just something to look for.
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