Change from manual transmission to Automatic

Save yourself tons of time and headache.......if what you want is an automatic, go buy one already equipped. What you are asking is possible but at what cost? Monetarily and time wise?

The cost effective way would be a donor truck of the same make with all the parts allready on it. Take 2 trucks and make one good one?

 

The new auto shift trucks are not automatics. They are computers doing the shifting and the engine and transmission talk to each other and the transmission can control the engine. They can do some fancy computer stuff. Like they can turn on the engine brake between shifts. They have GPS info on big hill locations. They can sense the load on the engine and change the shift points.

Allison makes the only true automatic for trucks. They are good for city driving like garbage trucks or fire truck. They are only like 5-6 gears not good for fuel economy. If you got money to burn anything is possible.

 

Even a new clutch and rebuild trans will not even put a dent it what you are attempting to change over. No computer will be needed. That old Allison would be full manual controls. It's all the unexpected things that will make you pull your hair out and regret doing such a task. If your asking questions now, there will be issues, I promise.

 

A 30 year old IH isn't worth what it would cost to do that conversion, especially if you have to pay a shop to do it. You will not have to change the rear end ratio, but that change would make the truck faster, at the expense of some power. If the trans is bad, just swap in a trans with more gears, a 7 speed for instance. You won't need any more crossmembers, but might have to modify existing ones.
Yes, an auto from another IH will bolt up, but as said before, there will be a lot of little things that will drive you nuts.
If you really want an auto, it would be more cost effective to find an automatic truck and swap the dump box over.

 

We to a automadic to a manual but atomadic to straight shift man im praying for you

 

If you load that dump truck down with stone and drive down the road with a automatic, you only need one thing. The moment that engine wants a downshift and you are reaching for the stick that is no longer there; followed by, the auto downshifting... then you know right away that truck is tuned properly with both the transmission and engine talking to each other.

What you do not want is transmissions that require satellite input to shift.