differentials and gear ratios

["Lahtinen, Marko" <MARKOL@isr.gov.au>]

I understand that my 1500 has a 3.889 diff ratio and 2000s have a 3.7 (as
standard).

Is there any merit in putting a 2000 diff in my 1500?  What are the upsides
and downsides of such as swap? (BTW, I have an R16 under the bonnet and a
stock 1500 4 speed).  

My thinking in considering a diff swap from 3.889 to 3.7 is that I would
achieve a faster speed (by about 5%) at any given rpm in any given gear, but
is this correct?  

I'd be grateful for any advice.

Marko
64 1500
canberra australia