Walter Buller said: (quoted from post at 01:36:57 11/15/13) I never heard of a 3.9 liter Cummins. I do intend to tow loads up to about 20,000#. I do not want an automatic tranny, unless it might be an Allison. This truck, like I said, is in super clean, super nice condition. If the noise of a 3.9 is louder than this 6.5, I wouldn't want it for that reason if for no other. This 6.5 is the noisiest engine I have ever seen. We are currently putting a "93 5.9 Cummins into a "94 Chevy dually with an NV-4500 5 spd. tranny. Can't wait to get it on the road.
That is a good combination but you should know that:
The NV4500 is rated for max torque of 460 ft-lbs. Not much aftermarket to help there. There are clutches that hold more but the gearbox is what it is. There is the fifth gear nut issue.
Plenty of people run that tranny with no issues but that depends on driving habits. A NV4500 behind a tuned cummins wont live long under abuse.
In stock form the Dodge 47re leaves much to be desired. Aftermarket upgrades make it a great transmission. I was going to convert to a manual, but spent way less to upgrade my Automatic and its a whole new rig.
FYI, I have built up my stock 47re for about $1000 and it will handle about 600ft-lbs with a converter that will handle 850ft-lbs.
It sounds like your on the right track in terms of this cummins engine in your GM. Might have fitment issues tho.
This post was edited by PretendFarmer at 05:24:28 11/15/13 3 times.
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