I have an 89' Cummins 1-ton with a 727 3-speed. I am in the process of making it a power house, but not too sure just how much the tranny will hold. Right now I am pushing out just over 230rwhp and just over 600rwtq with free mods. Once I upgrade the turbo and get the POD injectors I should be near 300rwhp and 800rwtq. Will the tranny hold that kind of power, or do i need to have it built?

thats a manuel right? then all you need to do is get a better clutch like a suncoast and you shoulndt have to worrie about anything for a while

No its a 3 speed auto. Like the one's they used to put behind the Duster, Hemi Cuda, and all the old muscle cars.

Why don't you put in a push-button torque flight? :lol

Why don't you put in a push-button torque flight? :lol
Because i dont know what that is. :jest:

I'm not sure what can be done to that transmission, but I know there is an adapter available for using a TH-400 with the cummins.

If anything i want a 4L80E or some Dodge 4 speed. I've heard Allison makes an adapter to use the 5 speed allison behind a cummins. I bet its pricey though.

If anything i want a 4L80E or some Dodge 4 speed. I've heard Allison makes an adapter to use the 5 speed allison behind a cummins. I bet its pricey though.

Between the adapter and a built Ally that would probably be super exspensive. :eek2:

Check out ATS Transmissions, just search for them, the specailizes with diesel trannys

Get your 727 built. The 727 tourqueflight can handle that much power as long as it is built right. They are also fairly inexpensive to get rebuilt. I have one in my Scamp and its stock and holds up great. Just my .02.

What about swapping to a 518? Its just a 727 with an OD. That OD sure would be nice for gas milage.

Because i dont know what that is. :jest:
:rotflmao:

for some reason I found that funny.

The 727 I had in my 440 Roadrunner was bullitproof but the later versions of it with the O/D were not nearly as dependable.... never understood why just adding the overdrive and instant :turd:, my wife had her 98 5.9 Ram in the Shop with the tranny under warranty 3 times and I rebuilt my own 99 5.2 after only 60k miles ( it had several real probs in it ). Neither of these trucks were raced or abused, well maintained... ( I had the roadrunner for 17 years ).
Now I have over 300 dragstrip passes on my 03 Ram Hemi along with other floggings and so far no probs. About to change the fluid to Amsol.
Are there other trannies, that they put into the bigger trucks, that would be suitable to your application? I know they put the 5.9 Cummins into all kinds of heavy duty vehicles and you may not even need an adapter.. there may not be anything suitable for the dragstrip however....
The 727 Can be built to handle the load but if you drive on the street be careful of how high a stall you put in, as I have seen more than a few of them cook the fluid in short order with a lot of street driving and high stall and not enough cooler, even though coolers were installed.
Good luck,
TJ

What about swapping to a 518? Its just a 727 with an OD. That OD sure would be nice for gas milage.


the 518 is for the smaller V8's... you'd want the 618

i wouldnt ever say any of the o/d units are a 727 with an overdrive. The 727's are good transmission while the 4 speeds are crap unless you build them up.

i've taken a few 42re's, 46re's and 727's apart and they are not the same. Same initial design, but that's about it.