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todd
Dodge Dakota
JOIN HERE
11/12/2005
11:41:13
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 Subject: seized 3.21 diff.
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Message:
Hey everyone. My 98 dakota has 180K and this is my first major mechanical!
I wanted to see if I could get some advice. My pinion gear snapped when it seized and I am looking to swap out my 3.21 for a 3.55 gear ratio. (The 3.55 seems to be much more available.) I know I will have a speedometer issue and wanted to see if anyone has made these adjustments. THANKS!!!
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intensedak39
*GenIII*
11/12/2005
11:46:22
| RE: seized 3.21 diff.
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Message:
you will not have a speedometer issue.
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.boB
Dodge Dakota
JOIN HERE
11/12/2005
16:48:28
| RE: seized 3.21 diff.
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Message:
The speedometer will be innacurate after a gear change like that. Not a problem, though. Just go down to the dealership and get a new driven gear to match the new diff gear.
As for the ration, I wopuld reconsider your choice. I swapped from a 3.21 to a 3.55. Very little differance. I could feel it, but it wasn't much. You really should consider a 3.92. Especially if most of your driving is less than 80 mph, or you tow a fair amount.
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Kowalski
GenIII
11/13/2005
08:21:57
| RE: seized 3.21 diff.
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Message:
Intense is correct - you should not have a speedometer issue as it is driven by the tone ring in the rear.
Lead, follow, or get out of the way
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Super bee
GenI
11/13/2005
21:17:54
| RE: seized 3.21 diff.
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Message:
do you knwo waht year that started?
becuase the speedo in my truck is all messed up
it reads 67 when im going 60 and its prety much 7 mph off all the way through 10-110
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crow318
Dodge Dakota
JOIN HERE
11/14/2005
08:20:41
| RE: seized 3.21 diff.
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Message:
They changed the dakota's in '98. I have an '97 and even though it has the new body style, the spedo was still driven from the tailshaft. In general, the '97 had cosmetic changes and the '98 got mechanical changes
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intensedak39
*GenIII*
11/14/2005
08:41:06
| RE: seized 3.21 diff.
IP: Logged
Message:
.boB,
looks like we're back on schedule.. haha!!
1998 and newer dakotas and rams use a tone ring that is mounted on the carrier, underneath the ring gear. The speedometer/abs sensor is located on the top of the differential and uses that "tone ring". Since it's on the carrier, the ring gear ratio is left out of the equation. Only way to change the speedometer on a 98+ is by changing tire size.
there is no gear to change for the speedo if you do change tire size. You'll need some sort of calibration unit or have your dealer reset your PCM for the tire size.
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