auto transmission upgrade allison 643?

[therabbittree]

hey i have a 89 first gen with 727 transmission. . its strong but has no over drive and no locking torque converter ... . so no e brake and no more then 75-80 mph. . so i was thinking better auto either a allison 643, as it locks up . . or a dd auto trans built up from newer dodges... mummn 643 is much cheaper. . any one know specs on these?... are they overdrive?... lock up all the tim eetc. . i guess if i did the allison i'd have to divorce my 205 transfercase... any ideas???thanks

later

deo

\x/ hillfolk!

 

[RonaldLarson]

Call or email...

DTT, Bill Kondolay, and he will give you the info you need. He builds his version of the 727/47RE which is practicaly bullt proof, and no engine match-up problems. You will, however probably have to move your transfer case back to accomodate the longer overdrive transmission. Not such a big deal for what you will end up with.

Ron

 

[Speedo]

Allison

While Allison makes several excellent transmissions and the MT643 is one I don't think that it would be a good choice for

your Ram. For one thing it is not an overdrive transmission, for

another it is a much larger transmission than you would want to deal

with, 478 lbs. dry. It is made to bolt up to a SAE #2 housing.

Depending on the A/N it can have one of 5 different torque

convertors with ratios at stall ranging from 3. 04 to 1. 82 to 1.

The ratios in the trans are as follows: 1st 3. 58, 2nd 2. 09, 3rd

1. 39 and 4th1. 00, reverse is a nice deep 5. 67 to 1.

 

[Devildog]

What about that transmission that the Germans want to put into new Dodge trucks I think it's a six speed. The article is in this quarters TDR magazine.