I wouldn't make the change unless it's new engine time anyway, but I put a
2.1 in my '85 camper and there's no lookin' back.  There's a noticable
difference on hills and over those long straight desert stetches,
especially into the wind.  I installed the Digifant system and the entire
2.1l cooling system.

I live in Phoenix, and have a lot of high speed straight and flat roads for
many miles around.  Consequently, and due to the fear of a thrown rod at
high RPMs, I replaced fourth gear with a .77 (about 10% higher) so that I
can cruise at 75 or so and not top 4K.

Karl Wolz