[a/s] Ford E40D

[Tom Mosca <tom@xxxxxxxx>]

Hello Folks,
     There seem to be a lot of transmission failures in Ford Super
Duty trucks since about 1990.  I've read about Ford replacing them
under warrenty, and I have a friend who had his replaced.  What is
wrong with them (the transmissions, not the people)?  :-)
     One solution I've read about several times is to replace the
transmission with a Jett rebuilt-and-modified E40D.  The company
claims to have fixed the flaws that Ford cannot.  I understand the
price is harsher shifts, for the claim is that Ford transmissions 
slip excessivly, and the slipping burns the fluid, in-turn causing
failure.  What do you know about Jett transmissions?
     Another fix I've heard of is to replace the tranmission with 
an Allison five-speed.  Probably this will require adapter plates,
driveshaft modifications, etc.  Have any of you done it?  How much
does it cost?  Does the cruise-control still work?  What are the  
pros and cons?
     What else is there to say about the Ford heavy duty truck
transmissions?  Can you recommend a brand and model of cooler?  Is
there a computer-chip replacement that solves this problem?  What 
is important to know about this transmission?
     Thank you.

Take care, Tom