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Re: [Fot] TR Diffs

To: "Joe Curry" <>, "Kas Kastner" <>
Subject: Re: [Fot] TR Diffs
From: "Randall" <>
Date: Sat, 28 Mar 2009 13:49:14 -0700
> All differentials take a lot of power. More even than the 
> transmission. Spiral gears (long tooth contact) 90 degree 
> direction conversion, planetary or LSD. It all sucks power. 
> Absent a significant design difference they'll be roughly the same.

I agree.  Two things possibly worth noting :

1) the power wasted is roughly proportional to the power transmitted, so TRs
will presumably lose a lot less absolute power than Hot Rod measured.  IOW
if they measured 25 hp lost behind a 500 hp V8; a TR with 100 hp might only
lose 5 hp in the diff.

2) A higher performance lubricant may help save some of that power.  Hot Rod
also found something like 7% more power at the wheels by converting engine,
trans, diff to full synthetic.

I don't have weights either, but the TR3-4 unit seems darn heavy to me.  The
smaller Ford might not be that much worse.

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