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Re: sm 420 and 305 tranfer case
It can be done but at what cost is it worth keeping the sm420.
A/A makes an adapter to convert the 420 to 23 spline round pattern, you could then source a dodge 23 spline np205 and it should all mate together.
I would just switch to an nv4500 and a 241 or 205 combo.
That is what I will be doing soon.
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63 k20 with cummins 4bt, owned sence 1982
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