did you take into consideration that your extra power may do the trick? you
will be crossing the traps at a higher speed, which will have your RPM's
higher :) Just thought I'd add in my $0.02 :-P
Tim Berry - Chesapeake, VA
97 Dakota Club Cab SLT (4315lbs)
318's best: 13.28@103.75
360's best: 13.03@103.76
355.8RWHP 395.2RWTQ (runnin lean)
----- Original Message -----
From: "Bob Tom" <tigers@bserv.com>
To: <dakota-truck@dakota-truck.net>
Sent: Thursday, October 17, 2002 9:50 AM
Subject: DML: A few 4.56 gears Qs.
>
> Hi
>
> At the track, I am currently running with 3.92 gears, 26" drag tires
> 44RE auto. and a 3000 (flash) stall converter with a total race weight
> of 4,080 lb. Prior to my diy ported heads, a dyno. showed that my
> peak hp was 5000 rpm. With my current setup, I'm going through the
> traps at around 5000 rpm or so.
>
> I will be getting another dyno. at the end of this track season but
> I suspect that the ported heads may have moved the peak hp up
> to about 5300 rpms. I'm replacing the R/T cam over the winter
> and I suspect that the replacement cam will put my peak hp rpm
> in the 5600 to 5700 rpm range.
>
> Because the 4.30 gears are no longer made for the 8.25" rearend,
> my only option is to look at the 4.56 gears (I may have to go with
> 28" drag tires) to get me through the traps at 5600 rpms or so.
>
> Is there anyone out there running with 4.56 gears (preferably in
> a 4x2 and 8.25")?
>
> How are the 4.56 gears in street and highway driving? I know the
> OD is a great compensator for low gears but is it enough for 4.56s?
> I'm old enough to have owned and driven mopar muscle cars in 70
> and 71 to be comfortable with 3000 rpm at 70 mph. My street tires
> are 28"ers.
>
> I've seen conflicting messages that putting 4.56 gears in the 8.25"
> may require some internal modding in the carrier (something to do
> with the rear abs?) I've looked at some sites and have not been able
> to confirm or not confirm this. Has anyone had to do this?
>
> Thanks for any inputs and/or suggestions.
>
> ticats
>
>
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