When I swapped around the gears in my Dakota, I went from stock size
tires/3.55 gears to 31x10.50R/3.91 Gears to 33x13.50/4.10 Gears.
One day I was driving past on of those portable Radar/Speed signs the Police
set up around here. It has a radar gun built in to the sign and tells you
what speed you are being clocked at. I wasn’t sure how accurate my
speedometer was after swapping to 3.91 gears & 33" tires so I took a couple
of laps. When the sign said I was doing 50mph and so did my speedometer, so
I would say 32” tires with 3.91 gears will read slightly high. When I
swapped to 4.10 gears, I found I was reading low. With 4.10, the truck has
more torque off road but sacrificed a little on the highway.
With the 32” tires, I would stay with 3.91 gears if you plan to regularly
drive it on the street.
Walt Felix
88½ Dakota Sport 4x4, 2000 Ram 1500 QuadCab Sport 4x4 and a 67 Barracuda
Coupe 340/4Speed
Walt@Walt-n-Ingrid.COM
http://WWW.Walt-n-Ingrid.COM
http://WWW.MoparsinMotion.COM
----Original Message Follows----
Date: Thu, 5 Apr 2001 23:12:40 -0500
From: "Kyle Kozubal" <grndak4x4@home.com>
Subject: DML: 4x4 Gearing
Hypothetically, say I were to go from a LT235 sized tire(3.55 gears) to a
32" BFG sized tire(31.75" overall diameter), what size gears would I need
to put my truck's engine back within reseasonable power specs/rpms?
I know all the is available for GenII 4WD Dakotas, are the 3.55 gears, 3.90
gears(or is it 3.91?), or the 4.10 gears. Obviously I assume I will need
either the 3.90s or the 4.10, but what are the pros/cons of each? Remember
now, possibly these gears would be going on a daily driver.........so keep
that in mind.
Based upon various charts I have looked at, I think I could get away with
either the 3.91 gears or the 4.10 gears, but since gears/lockers/limited
slips are rather expensive........I want to do it and do it once, and be
happy with the decision.......if indeed I was doing a gear swap. Thanks for
any info.
Kyle
93 Dakota 4x4 V6
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