Re: nv4500 input and np231 input
I may be wrong, but I thought that the 21 spline NP-231 input shafts came behind the 4cyl.
I would think that you should be ok, I second the advice to contact John at JB Conversions.
Sorry I don't have the number with me, but if you invest a small amount of time and search
thru some of the Monster links I've seen floating around, it would be worth your while.
The input of the NV4500 (10 spline) should be standard and if you get the correct tranny,
the output should bolt right up to the NP-231. It's a fair amount of work and you'll be
testing your fabrication skills, but you won't regret doing the upgrade.
90YJ 4.2L NV4500 456:1 33's Twin ARB's XD9000i - San Diego, Cal.