So tonight my buddies and I were rodding around in a field. I got home and I heard fluid coming out of the under carage. I crawl under and all I see is tranny fluid flowing out the front of the transmission, out of the inspection plate, and then onto the ground. What gasket or seal could this be? Is it an easy fix or a rather hard time consuming fix?

Information on truck:
1991 f150 2wd with the E4OD.

 

Front pump seal. If you were messing around in a field, you likely overheated the transmission, as these trucks, especially the earlier ones such as yours had marginal transmission cooling. Lots of low speed high throttle driving will heat them up real fast.

I'd let it cool down, check the fluid level, and see if its still leaks.

 

I sure hope it doesn't leak tomorrow. I will have to swing by the auto parts store tomorrow and pick up more fluid. Thanks for the reply by the way

 

seals gone bro, adding more fluid wont help it will just keep leaking out

 

+1 yea usually stop leaking once cool down, swap to a larger cooler or add another one to the one it has now removing the radiator from the trans cooling loop in the process.

Replace your fans clutch so it pulls air through the cooler/s when it needs it most, when your not running down the road at cruise speed getting natural air flow.

Do so and odds are high you won't have any more problems with it overheating spewing its fluid.

 

Sorry but if it started leaking, it needs a new seal. Even if it doesn't leak when it cools off the seal was overheated and is now unstable. You are gonna have to replace the seal.

 

Mine would leak after plowing wet heavy snow in a lot for a while, did it couple times until I put two and two together, run down the road a few minutes it'd stop or get home it wouldn't be leaking any more either. Make it work it start spewing fluid again.

Dawned on me the clutch fan wasn't working had little or no air flow working in parking lots even though it had a cooler but was fine running down the road.

That was better than 5 years ago at this point, replaced the clutch on the fan I've never had another problem with it to this day and I did not replace the seal.
I added the second cooler just for added insurance taking the radiator's cooler out of the loop in the process.

Don't want any heat from the engines coolant transferring to it and no chance of cross contaminating coolant with the trans fluid with them cheesy plastic end tanks fluid not going through it, about useless **** on a boar hog anyway far as a cooler goes IMO.

A trans temp gauge is always a good idea, I added one back then too.

Of course won't do much good if the trans has been overheated multiple times and run low on fluid, be to much internal damage for a correct cooling system to make up for.
I knew that wasn't the case with mine and I'd stop when notice it dribbling fluid out on the ground leaving bright red line in the snow!

 

If you do replace the seal make sure the rubber is blue or black. The grey ones were OEM and those are prone to failure.