My 1991 Ranger, 3.0L V6 has the Mazda transmission in it. I just stopped
driving it about 2 months ago and it is now for sale after 6 years of myself
driving it. No TSB's that I was aware of. The only two issues I have had
with this transmission are the rebuild I had to have done to it, mainly
because the original owner neglected to ever check the transmission fluid.
As a note, and after some research on the internet, I found out the 3 rubber
plugs on the top of the transmission are known to slowly leak fluid, which
was probably partly to blame for my transmission failure. Easy fix is to
remove them and either silicone the rubber plugs or replace them with metal
The second issue is a noticeable whine in 1st through 3rd gear, which is
typical of these transmissions, the complete rebuild did not cure this
sound. Nor am I sure (or the retired Ford transmission mechanic who rebuilt
mine) what is the source of this sound.
I cannot say whether these problems affect the newer transmissions or not.