Unless the transfer case has been changed, the '76 model will be a NP203. The two are similar in format; however, the NP203 has an aluminum case of the low-range box. The NP205 is all cast iron. Secondly, the blue and silver aluminum tag on the case will be stamped as 203 or 205. Third, the t-case lever will either have Lo-LOC - Lo - N - Hi - Hi-LOC (NP203) or 4Lo - 4Hi - N - 2Hi (NP205).
The front axle on your truck will not have external hubs, unless that has been changed, also.
The front axle on your truck will not have external hubs, unless that has been changed, also.
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