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This is a NP435A which has a 1.31 third ratio, identified by the 25 tooth third gear on the main shaft.
GM GMC and Dodge version counter shaft.
There where a few possible tooth counts so you need to verify the counter shaft tooth count given here and that you have 25 tooth third gear on the main shaft.
The tooth count is 14, 25, 33, 38.
You need to verify this is the tooth count you need as the wrong tooth count counter shaft will not fit in your case with your main shaft.
