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Re: Question for rear end experts

To: <>, <>
Subject: Re: Question for rear end experts
From: "Ian Spencer" <>
Date: Mon, 25 Jun 2001 11:58:18 -0500
Jay is right. I too have the same set up on both my Harringtons except I don't 
have the Holbay engine. One has a 3.89 and the other a 3.70. I do see some loss 
of acceleration off the line, but the gain on freeway driving is excellent. To 
be honest, I didn't notice too much difference between OD in 4th with the 4.22 
and a 3.89 in 4th without OD. They both seemed to run out about the same. For 
freeway driving, the 3.89 is the way to go. It really gives the car the long 
legs it needs to keep up with traffic.

>>> <> 06/25/01 10:14AM >>>
I have a 3:89 with an OD and am very happy with the combo.  It depends on
what you want the car for.

Assume you never turn on the OD.  The 4.22 will be quicker and put less
stress on the car from loading (though perhaps more stress because you will
find yourself driving harder ;-)    The top speed will be lower on the

Now, when you add the OD, the 4.22 with OD will have a lower rpm at 65+
than the 3.89 without OD.  But, the 3.89 with OD will have an even lower
rpm at 65+.

So, what do you want more quickness or even lower rpm on the freeway?

I chose the lower rpm on the freeway.  That's where my car is the most, and
especially here in Los Angeles, where the speeds are closer to 70 and up,
the lower rpm made sense.  If you won't be on the freeway as much, the 4.22
might make more sense.  I also have the Holbay engine which makes up for
any lower rpm issues.

It has been said that the 3.89 OD combo will cause the engine to lug too
much when in 4th OD.  On the other hand, if you are mindful of it and
downshift before accelerating or taking on too much of a mountain, I figure
you will be fine.  I have not noticed any issues with the engine losing any
sort of power - but, then that could be because of the Holbay breathing and
power in the upper ranges.


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