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Keith Seymore · 12-19-2014, 11:44 AM

Quote:

Originally Posted by dragginmetal

What's the difference in a JB system and a JN? My 88 has a JN.

Attachment 1338074

Just the RPO designation.

I suspect it was changed to avoid confusion with the the carryover C/K/R/V vehicle (ie, carryover got "JBx", new GMT400 got "JNx" for a comparable system).

K