That transmission (stock) is rated for 450 ft-lbs of input. The stock 47re is also rated for that however I would personally rate the 400 at a higher level of dependablility. All that changes with aftermarket parts.
In your case, that might be the way I would go but I would need a transmission that had overdrive.
In a case such as mine where I have a Dodge truck, beefing up the stock tranny made so much more sense financially than any other option.
How are you going to address only having 3 speeds now? In my 97 Cummins, I consider overdrive a necessity. I would easily hit defueling RPM's without it. I could put in a governor spring kit and 60# exhaust valves to raise that defueling RPM but I suspect I would be hitting 3000 rpm's at 70mph or so with a 3 speed.
This post was edited by PretendFarmer at 07:15:16 12/17/13 3 times.
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