TH350 Problems.....need some advice

[Gregg72340]

1985 c-10 305/350 combo

I am trying to pull this truck outta the woods because it was free, and it has a trans issue.  Previous owner (10 years ago) said that it had a head gasket issue.  Well low and behold it really doesn't.  It holds all the coolant and doesn't smoke(after running for 2 1/2 hours) Bigger problem it has is this with the trans.  It basically is puking trans fluid out as fast as it is going in.  what fluid that was still in the trans did n not smell burned and is not really discolored other than normal color.  I cant see anywhere externally (lines, pan, modulator, rear seal).  am I safe to assume that the only other place that it might be leaking out of is the front seal?  When you fire the truck up and put it in gear it tries to move itself forward(Can feel it try to move itself slightly) but loses the fluid almost as fast as you're putting it in.  Does anyone think this may be worth trying to put a front seal into the trans to see if it might work or am I barking up the wrong tree here and should just replace it.  since it feels like it is trying to move before it loses all the fluid I was just hoping since the seal may be shot that it just cant build enough pressure to move.  Just curious everyones thoughts.

Thanks in advance
Gregg

[rroeder96]

since th350 trans are so common i would go ahead and replace it and keep your old one for a spare then when you have time you can rebuild it you never know when you might need one....

[Irish_Alley]

Where is the fluid coming out of. Also if you do swap transmissions make sure you swap the same one there are two th350 one has a short and the other has a long tail besides that they are the same but since it makes the transmission smaller or longer it also affects the drive shaft size.