The 100-6 rear end is a 4.11 while the 3000 is a 3.9. The overdrive ratios are
28% for the 100-6 vs 22% for the 3000. I changed my 100-6 rear end for a 3000
and was pleased with the result. While not quite like putting a Lempert 3.54
rear end in a 3000, I do have easier cruising at highway speeds and better
fuel economy. In addition, my speedometer, which used to be wildly optimistic,
is now closer to being accurate.
Rick Swain
> Hello to the forum,
>
> I have multiple projects going on at once with my AH restoration so I
> apologize for the multiple postings on multiple topics as of late.
> Currently there is over 1/2 inch play in the diff on my '57 100-6.
There
> is a loud clunk when shifting gears, and at highway speed, it whines quite
> loudly. I have not opened it up yet to know what's going on, but I don't
> think it can be good. If adjustments are out and gears are worn, replacing
> gears will be expensive I think. I have also heard someone else talking on
> this forum about loud rear ends with lots of play in 100-6's, but don't
> remember what his responses were.
> Several questions - how bad can this be inside, and can you put the
diff
> from the 3000 (o/d) into a 100-6 (o/d)? Are there advantages to the
different
> ratios? A straight swap might be less expensive and easier than a rebuild
of
> the current one. Again I haven't taken it apart yet so all of this is
> preliminary. Thanks in advance for your vast knowledge...
>
> Darin
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