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Well actually almost all of the medium duty 5.9med duty trucks come with a 1.75 or 2 inch input shaft. It would be easy if i have a bigger input shaft. Alot of the c70's had a 1.5input shaft but the OE clutches are rated for around 300-500ft lbs. I understand that this is not a medium duty...

Yeah i'm not to worried about the clutch. The smallest set-up that SouthBend would make for me was rated at 750ft lbs. Good to hear on that it is a SAE#2. The last piece of my puzzle is the starter. If i get a starter that will bolt to the SAE#3, will it mate up to the 173tooth 13" flywheel? And...

Ooh sorry, i forgot to say that the guys at ATT transmission (they bought all the medium duty trans from spicer/eaton) told me i could not fit a 14" flywheel and clutch. Hence the reason i am trying for the 13"

So you are saying a regular cummins starter will mount to the SAE#3 bellhousing and work properly? The regular 5.9 cummins requires an adapter to use the stock starter on a 13" clutch(for a nv4500). What flywheel do you have on your set-up?

Ok, here is my situation. I am mating a Cummins 6BT to a spicer 3053 trans. I am mating them using a SAE#3 bellhousing. I can buy an aftermarket flywheel and SouthBend will make me a stout clutch that will fit the 1.5inch 10 spline input shaft of the 3053. The problem is, what starter do i use...