Keep in mind, 3.7s aren't as plentiful.
The 3.7 rear came in the 79s and some 78.5s.
75-78 1500s came with the 3.9.
Good luck,
Dan Dwelley
77 Midget
Alexandria, Va.
--- type79@ix.netcom.com wrote:
> Glen,
> When I put a 1275 in my Sprite Mk.II I opted for a
> 3.9 diff. I previously had a
> 72 Midget with a stock 1275 and a stock 3.9 diff and
> that cruised well on the
> highways. The engine in my Sprite Mk.II is somewhat
> modified so I didn't mind
> giving up some low-end going with the 3.9 diff. I
> have been very happy with it.
>
> I believe the 1500's used a 3.7 diff, which would
> give you even more room at the
> top if that's what you want.
>
> For further details, please refer to Frank's
> forthcoming response.
>
> Jay Fishbein
>
>
> Glen Byrns wrote:
>
> > After examining the diff. on my Sprite I notice
> that it has quite a lot of
> > play in it. Checking the usual sources I see that
> replacement gears are not
> > easily available. Assuming that I can eventually
> find a servicealble
> > differential assembly, what ratios are available
> and what would go best with
> > the 1275cc.? The stock ribcase with the original
> diff. has too low a low
> > and not enough high. I expect to cruise the
> highways much more that I
> > expect to climb phone poles and don't really have
> the resources yet to do a
> > 5-sp conversion.
> >
> > Thanks to the list as usual for the excellent
> advice. I've yet to ask a
> > question that wasn't answered with wit, wisdom, or
> both.
> > Regards, Glen
> Byrns
>
>
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