I am in the process of replacing transmission on my project truck which has no transmission at all.

I can choose between an Allison 2400 (for 2wd), and a standard 47RE or a 48RE if it will fit my '99 24v motor.

Which one would you choose.

I am within hours of buying, so this is farely decisive.

 

what's the cost difference? I know some of the super-duper 47/48re's can be $6000+!! If the Allison is comparable price I'D go with the 5-speed. Quite a few medium duty trucks use the Allisons, so flex-plate and torque converter shouldn't be too tough. My other question was electronics - can you run the Allison in a standalone mode with a DC ECM/PCM (maybe from a manual trans truck)? I would think the Allison would be inherently stronger, but once the guts are massaged, I don't know.

 

https://www.dieseltruckresource.com/...hlight=allison

More info for ya.

 

Well I disagree with all the posts that says it cannot be done. Cummins ISB + Allison transmission is done commercially for some companies.
The one I was interested is on a Freightliner MT55 Fedex delivery van.
It has a Cummins ISB-02 185 with an Allison 2400 transmission.

Only neg issue is adapter to tranfer case, which I believe is same as 1000 on GM trucks, and the output of motor is only 200hp it will need "pumped up" a little, but it's the newer version of the 5.9 ISB.

I decided to go with a good ol' standard 47RE, but if somebody is interested in the combo above, it will sell for approx 6,500, but you will get the whole van (2004 Freightliner M55)

Check Freightliner web site for more details.