My car drips

[Firetodd]

I have a 67 with a 383 and a automatic 727 and have some drips from the bottom of my car. I have an oil leak that drips a couple drops on my garage floor after a drive. That bugs me, but i believe it is the rear main seal and I am going to change that in the next week, along with the oil pan gasket.

The drip that I'm concerned about is transmission fluid that drips from around my pan gasket it has gotten worse and drips 10 drops or so after a drive. I have also noticed a slight moan from the center of the car when decelerating when traveling about 25-30 mph. I have a new rear end, new rear wheel bearings, new brakes, and new u-joints. I had the moan before I replaced those parts. Anyway the transmission fluid level is shows full, and car has power and drives strong. I'm wondering if I have transmission problems or torque converter problems.

I noticed it today after taking a test drive after changing the intake manifold. For fun, here is the before and after picture. I had to change the stock air cleaner so that I could close the hood

Before:


After:

[Firetodd]

I guess I should also ask, what's the best way to change the transmission pan gasket? Do I have to pull the transmission to change it?

[JB400]

I'd try tightening up the trans pan first to see if any are loose before I'd go through the hassle of changing gaskets.  If you do find them all tight and decide to go ahead and change the fluid, start at one corner and just loosen up each bolt just a little bit on one side.  Repeat on the row of bolts down the other side of the corner that you started with.  Make sure that you have a big drip pan under trans at this point.  Go ahead and completely remove the corner bolt and the first 3 bolts on each side that you loosened.  Then, just loosen up the remainder of the bolts slowly jumping from side to side to allow the fluid to drain slowly.  This prevents a big mess.  Remove bolts as needed to allow fluid to drain until it's all drained.  You might as well change the transmission filter while you have the pan off.  Make sure the transmission and the pan are both clear of old gasket before putting on the new one.  Some use silicon to glue the gasket to the pan; that's entirely up to you.

You don't have to pull the trans to change the pan gasket.  Just a matter of sliding under the car to get to the pan.

[ChargerST]

Are you sure that it's the transmission pan? Most of the times it is something else and the oil just collects on the transmission pan. In my case it was the shifter shaft seal (there are two). I would clean the transmission really well and then put some baby powder on it. Go for a drive and it should be visible where the oil is coming from.
btw. you can buy a tool for less than 20 bucks which allows you to change the shifter shaft seal without dropping the pan!

[Cooter]

I've found (if it is indeed the trans pan gasket) only two ways to stop a leak. Glue pan on with sealer which have done, but don't recommend, and using a later model pan gasket that is reusable. Usually plastic with rubber.

[green69rt]

I've found (if it is indeed the trans pan gasket) only two ways to stop a leak. Glue pan on with sealer which have done, but don't recommend, and using a later model pan gasket that is reusable. Usually plastic with rubber.

  Also, take a close look at the speedometer pinion gasket.  Easy to check and easy to replace (well, at least easier!)

[Just 6T9 CHGR]

Are you sure that it's the transmission pan? Most of the times it is something else and the oil just collects on the transmission pan. In my case it was the shifter shaft seal (there are two). I would clean the transmission really well and then put some baby powder on it. Go for a drive and it should be visible where the oil is coming from.
btw. you can buy a tool for less than 20 bucks which allows you to change the shifter shaft seal without dropping the pan!

  Check higher than the pan gasket first