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Old 07-15-2022, 02:20 PM   #1
SlimTim
Senior Member
 
Join Date: Feb 2016
Location: Portland
Posts: 146
Default SN 6400 VT365_ISL400 Repower

I decided to repower my 2010 6400 SN with a Cummins ISL 400 and an Allison 3000 transmission. I am not quite finished with the project but I feel I am close enough to start posting some photos.

To start I looked at the International DT466/570, Cummins 6.7 ISB and Cummins ISL 400 as possible replacement engines. However Ultimately I decided on the Cummins ISL for the following reasons:

The DT466/570 would have been the simplest but unless you want to purchase a remanufactured engine it is hard to find one with less than 250k miles. Also the max stock HP for these engines is around 300 HP, but high HP/torque DT466's are nearly impossible to find. Because of this I dropped the DT466/570 from my list of possible engines.

The Cummins 6.7 ISB was a very strong contender and if I was to do this again I would likely go with this engine. The 6.7 engine was used in many RV's and low mileage engines can be easily found. Another advantage of the 6.7 is that you can retain the stock SN Allison 2500 transmission and this would make the repower much easer (and cheaper). Ultimately the reason I dropped this from my list of possible engines was because I wanted more HP.

With the DT and ISB engines eliminated the Cummins ISL 400 (8.9L Engine) seemed to be the best choice. However because the ISL has 400 HP and 1200 FT LB torque I needed to also upgrade the Allison 2500 to a 3000 series transmission adding a significant amount of work and additional cost.

Assuming I can remember how to upload photos to the forum I will start posting some pictures.
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