guys i really need your help if you know how to help me and my dad please reply

[67chevy1series]

okay today i go out side and notice i the battery is dead on my dads 1970 chevy lwb 1/2 ton because my mom left the lights on so i put it in nuetral and move it so i can pull my truck out of the garage to clean it , and when i move it i notice there was about a pint of tranny fluid on the ground! so i look at the tranny fluid its says''add" well i go under and wipet the tranny Xmember clean and wacth it after about 5 mins there is already 5 spots were tranny fluid is dripping again what do we do? what is wrong?

[csb#356]

Where's it look like its coming from, Front, back, pan, dipstick. Need more info. I'm assuming its a 4x4

[chevy_mike]

You likely have a seal that is bad and when it sits the converter is draining back, which will raise the fluid level higher then the seal that is leaking. It then drains thru that seal until the fluid level is below that point.

As for which seal, it can be any number of ones but a really common one is the o-ring on the dipstick where it comes into the trans case. It can be a real output seal, selector shaft seal, pan gasket, etc. You really need to find out where the fluid is dripping/leaking from to know what to fix.

Also, you are checking the fluid while it is running, after cycling thru all the gear selections and putting it back into Park, correct? Ideally you want to do this when it is hot as well. You can overfill the trans which can also cause it to leak.

Good luck.

[67chevy1series]

it is dripping from ?????? down to the tranny crossmember then onto the floor so anywhere above the crossmember....yes it is a 4wd 1/2 ton chevy stock height

[SeventyOne]

If it's dripping onto the transmission/tcase crossmember it might be the rear seal or even the T-case. You're going to have to get under the truck with a flashlight and find where the leak is originating from - maybe even remove the trans tunnel/hump if it helps.

If you can't tell, clean everything up real well then let it sit and see where the new drips come from.

[67chevy1series]

thank you!

[Mike C]

Some TH350s have a vent hole in the end of the trans yoke, and I guess an internal seal. This tends to leak after the truck has been parked for several days and is a pain to track down. Something else to look for.

[kingburnett]

Originally Posted by SeventyOne

If it's dripping onto the transmission/tcase crossmember it might be the rear seal or even the T-case. You're going to have to get under the truck with a flashlight and find where the leak is originating from - maybe even remove the trans tunnel/hump if it helps.

If you can't tell, clean everything up real well then let it sit and see where the new drips come from.

Like SeventyOne says clean and then put a piece of cardboard under to find the first drips. Also check any tubing lines especially at the end fittings. Be sure you are on level ground when topping off the fluid too.

[67chevy1series]

thanks guys this is all good info and each of these will be tried we are gonna take it down to see what is wrong and if its easy we will fix it if not then we will jave it fixed