Bronco ii A4LD.. Ouch!! Help please

[BroncoKen]

I have a 87' Bronco ii with the ever so horrible A4LD transmission. I seem to blow front seals in the last 2 replacements I put in it. I have read articles on how bad the transmissions are but are they really that horrible. I mean from my experiances yes. But does anyone know what could be causing this? The lastest transmission i bought with about 25000 miles on it. The problem only occurs during highway driving of 30 miles or more.

[Ranger Dave]

check the vent

[BroncoKen]

All the vents are clear. Im beginning to think its something in the valvebody or maybe a pump issue causing to much pressure?.?. It just seems really odd that I would get 2 of them in a row with the same issue.

[KRE]

I don't know how deep your into iron, so the following is a little I've learned over the years, about seals an turning iron.
Most transmission front seal issues are from, a transmission bell housing that is not dialed to the engine, or there is a problem with the iron the seal is trying to seal.
The seal drain could be plugged.
A bent or mis- aline'd flywheel can also cause a seal issue, as well as a converter that is not running true do to out of alinement or damaged flex plate holes.
Stacking of + or - of spec's will also cause problems that will not be found without the help of a dial indicator, the tech spec's, an time.
I've also found the wrong seals installed, or correct seals installed improperly.
Then again I've seen seals being blamed for a leak somewhere else.

I would suggest taking it to someone that has the ability an tools to correct the issue for you, and be done with the heart break, then enjoy the truck.

[Ranger Dave]

also get the updated flywheel spacer