There is really not enough of a difference between the 4.2 and the 3.9
differentials to warrant swapping out. Spridgets are so great on gas anyway, I
doubt that you would even notice a monetary savings. The 4.22 is way more fun
and actually the 4.55 and 4.88 are even greater fun!
Mike C
-----Original Message-----
>From: Walt & Zoe Harrison <wzharrison@comcast.net>
>Sent: May 15, 2007 12:36 AM
>To: Bill L <pythias@pacifier.com>, spridgets@autox.team.net
>Subject: Re: 3.9 rear
>
>Bill,
>
>Here's my two-cents ... the 3.9:1 ratio rear end is quite nice with a Sprite
>1275cc
>engine and 4-speed web-case tranny. We've had one for years.
>
>It bolts right up to your existing rear-end and drive shalf, no major
>changes involved.
>It gives you higher cruising speed with less RPM, and better gas mileage.
>It pulls just
>fine from a start, not quite as quick as a 4.22:1, but then it seems we're
>shifting into
>second almost immediately anyway, so this may be a nit. I like the better
>range you
>have in second and third. Mileage-wise, our Sprite averages 30+ MPG running
>premium. The down-side? We cannot cruise 70+ MPH on the interstate for
>hours,
>but then that's no fun to start with, and we try to avoid it. As for
>justifying the expense,
>amoritize the cost over 40-60K miles, not 4K.
>
>FWIW, Walt
>
>----- Original Message -----
>From: "Bill L" <pythias@pacifier.com>
>To: <spridgets@autox.team.net>
>Sent: Monday, May 14, 2007 4:26 PM
>Subject: Re: 3.9 rear
>
>
>Hello ,
>
> Thanx to all who replied offering 3.9 rear ends for my trip to
> Mo.... interestingly enough, after running some numbers i'm
> not sure the conversion makes economic sense... the going rate
> (as defined by sales on ebay) seems to be somewhere between
> $125 and $200 not counting shipping.... now, if the change in
> gearing of ~7% results in direct savings of the same amount i
> could expect to save a TOTAL of about $35 to $40 over the 4000
> mile trip (at $4/gal)... .. hmmmm... .....
>
> have to justify the expense some other way.. :-)
>
> anyone else running a 1098 with a 5 speed and a 3.9 rear end? a
> 3.7? how is the power as compared to the 4.22? (assuming that
> you HAD a 4.22 and changed).. overall mileage? snap off the
> line? freeway cruising.. .. ???
>
> ?????????????????????????????????????????
>
>
>
>
>--
>Best regards,
> Bill mailto:pythias@pacifier.com
>
>
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