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Old 10-01-2009, 09:41 AM
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Cummins Conversion Tranny Questions

Hey guys, I will be doing a Cummins 12v conversion within the coming months and need your advise on what I should use for a tranny. The truck is and will be my daily driver. I tow pretty often, but nothing heavier than 7500 lbs. Truck has a 14" lift and 44" military tires (180 lbs each, lol). The Cummins will eventually get a set of twins but nothing too crazy, everything will be built with mileage in mind while still having the ability to mash the skinny and get a move on. The truck currently has the factory tranny in it but since I will have to buy an adapter plate and stand alone PCM, I could pretty much run any tranny. What do you guys think? There is a 5R110 for sale right now that kinda got me thinking, lol
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Old 10-01-2009, 04:19 PM
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bump...........
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Old 10-01-2009, 04:20 PM
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What gearing will you be running?

My vote is a BTS 4r100
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Old 10-01-2009, 04:22 PM
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bts would be a lot better. that way you dont have to get the computer that goes with the 5r100
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Old 10-01-2009, 04:30 PM
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Quote:
Originally Posted by bockhold View Post
bts would be a lot better. that way you dont have to get the computer that goes with the 5r100
Actually you still do need a trans controller for the swap
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Old 10-01-2009, 04:34 PM
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I regeared the axles already with 5.13 gears. And yes, no matter what will need a stand alone controller. I want to stick with my current transfer case which is an NP273. I was even considering an Allison 1000. Keep the ideas and insights coming guys!
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Old 10-01-2009, 04:57 PM
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Originally Posted by Dave View Post
Actually you still do need a trans controller for the swap
so the bts requires its own computer?
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Old 10-01-2009, 04:58 PM
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Quote:
Originally Posted by bockhold View Post
so the bts requires its own computer?
In the case of a cummins swap yes. But if you were putting it behind a 7.3 no it doesnt. If its going behind a 7.3 it just requires different programming
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Old 11-26-2009, 12:26 PM
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I have put a Cummins in an old Ford, and lucky for me I am 9 minutes from a guy that does this exact thing for a living. Jason is really easy to talk to, one of those local wicked smart, friend of a friend mechanic. He is a great resource at fordcummins.com It is a fun knuckle busting undertaking.
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Old 11-26-2009, 02:25 PM
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I would say the allison 6 speed if your looking for mileage and good rpms with the tall gears, I was thinking of doing this swap myself but behind the 7.3, Im gonna supercharge it first and then worry about what tranny I want to build lol. Ive talked to a few different companies about this, you can have the stock allison computer set-up to run the tranny with a custom flash from someone who knows and works with allisons and also a custom harness. Its alot cheaper than a standalone unit but alot more time consuming and a little trickier to make up yourself. I really like the idea of having a 6 speed auto tho!! Just my .02 cents, It is more expensive than say a built dodge auto or a bts 4r100... but they can also be built to handle 700+ whp and the stress of towing heavy as well.
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