Leaking transmission

[Yukonjack]

1986 k3500 is leaking bad. It has finally warmed up and I rolled under to have a look. I thought letting it sit out the cold was the humane thing to do as well, it would concentrate the drip of trans fluid and help pinpoint the leak. I am still not clear on the source. Anyone point me in a general direction with these pics?

 

[Yukonjack]

Pic2

Pic2

 

[Yukonjack]

3

Parked for 2 months at least and the leak is not stoping if that helps in diagnosis.

 

[firebane]

Either vac modulator or cooler lines I'd say.

 

[Yukonjack]

Thanks Fire. I plan on rolling up on some ramps to get a better look. I'll start there.
Maybe some better , not a lot of room atm.

 

[mp1977K-5]

Leaking TH350 on my 1977 K-5 Blazer

I have a near stock 1977 K5 Blazer with a 383 engine, rebuilt TH350 trans, NP203 transfer case.
I have a near same issue. Leaks a bit if parked on a slope such as along a curb, then I haven't driven it for about three weeks left it parked passenger side along the curb and just two or three days a go it puked up maybe a cup of ATF.
Looks like it came somewhere along the passenger side of the transmission.
Normally I park in our near flat driveway, but had to park along the curb the last three weeks.
I've had the dip stick/and "O" ring replaced, replaced the trans pan gasket, replaced the aux cooler lines.
I'm at a lose and it driving me bonkers. "HELP"

 

[PrairieDrifter]

Maybe the dipstick tube? Has there been some "severe" temp changes in your area?

 

[CSFJ]

I've been chasing a leak on a 700r4 myself. Thought it was the pan gasket, but nothing I did could stop it. same kind of issue, steady drip while parked. I'll be changing the o-rings on my 2-4 servo next. I think It's the only other opening in the area where my leaks.