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Truck in question is a 66 Camper Special with the "close ratio" NP 435. Thinking about swapping it out with another that has the super low first gear. I know if I go this route and find one newer than 1967 it will have the 23 spline input shaft and will necessitate a new clutch disc. But
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Re: Need some NP435 swap info
Posted by:
Russ Roth
(24.21.77.---)
Posts: 236
Posts: 236
Date: July 07, 2011 03:08PM
Well for once you're right, Terry. 
The 23 spline didn't start until the '69 models but you might be smart to change it. The 10 spline seems hard to find and I have been told at the local clutch shop I use it is no longer available. I think the 435's are pretty much the same throughout production after the spline change but I wouldn't stake my life on that. Not sure about the bolt patterns as I think there may have been a change in those but I think maybe at the same time as the spline change.
RR
The 23 spline didn't start until the '69 models but you might be smart to change it. The 10 spline seems hard to find and I have been told at the local clutch shop I use it is no longer available. I think the 435's are pretty much the same throughout production after the spline change but I wouldn't stake my life on that. Not sure about the bolt patterns as I think there may have been a change in those but I think maybe at the same time as the spline change.RR
