Unless you have adjusted your PCM for the taller tires, it doesn't know what
size tire you have on there, so while the speedo might have been reading
60mph, you weren't going 60mph.
brian cropp
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
teseract@moparhowto.com
Sent: Thursday, May 07, 2009 2:57 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Gears
Was a 4.11 rear end available in '95 from the factory? I was on the freeway
last night and noticed that with 31" tires at 60mph, the truck is pulling
about
2000rpm. I've read in the archives that trucks with the 3.90 rear end with
the
stock tires (which are a good 3" shorter in diameter than my 31" tires) pull
about 2000rpm at 60mph. This seems odd to me as the underhood sticker
doesn't
indicate anything about the different gear ratio - but if I had the standard
3.22 gears I don't think I'd be pulling the RPM I'm pulling at 60mph with
the
size of tires I have.
I guess I'll be doing the string trick next time I'm under the truck...
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