No, changing to a non-factory gear ratio *does not* require any sensor or
PCM program change. The speed sensor is attached to the axle, AFTER the
differential. Regardless of axle ratio or transmission gear, that axle
will always turn the same number of times per mile.
TonyC wrote:
> I'm saying that switching to a FACTORY available ratio/tire size will not
> necessitate buying any items to correct the speedo. That its as simple as
> having the computer set to the new values. But changing to a NON-FACTORY
> ratio may (Probably) require one to do so.
> TonyC
>
> -----Original Message-----
> From: Andy Levy <andylevy@yahoo.com>
> To: dakota-truck-moderator@bent.twistedbits.net
> <dakota-truck-moderator@bent.twistedbits.net>
> Date: Sunday, October 28, 2001 3:17 PM
> Subject: Re: DML: Re: Re: axle ratio
>
>
> On a 1998 or newer (and since we're taking about a 4.7, it's a '00 or
> newer), a change in rear-end ratio does not require areprogram, as the
> speed sensor is on the axle and not the driveshaft. Only tire size
> changes need a reprogram.
>
> TonyC wrote:
>
>> 3.92 is a readily available ratio. The computer can be reset by the
>> dealer to correct the odometer/speedo readings meaning you don't need a
>> speedo black box unless you're running really odd tire sizes.
>>
>> TonyC
>>
>> -----Original Message-----
>> From: kwreimer <kwreimer@email.msn.com>
>> To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
>> Date: Sunday, October 28, 2001 9:12 AM
>> Subject: DML: Re: axle ratio
>>
>>
>>>Can 3:70 be obtained? if so this may be better, still close to the 3:55
>>>but a little quicker of the line with the 3:70 or 3:90's, the 3:90 will
>>>be ok i have thought about going to these myself, i have a 2K dak with
>>>3:55 limited slip now. I like the 3:55, but would be nicer to be quicker
>>>off the line. the RPM change should be minor, only around 200-300 RPM
>>>More. ----- Original Message -----
>>>From: "DML" <gwbower@hotmail.com>
>>>To: <dakota-truck-moderator@bent.twistedbits.net>
>>>Sent: Saturday, October 27, 2001 9:27 PM
>>>Subject: DML: axle ratio
>>>
>>>
>>>> Anyone drive a 4.7 with a 3.92 axel ratio? If so how is the performance
>> at
>>>> highway speeds. what is rpm at 70mph (or even 80mph if you go that
>>>> fast). gas milage? I am trying to decide what ratio to get with a truck
>>>> I am
>>>going
>>>> to order when my present truck sells.
>>>>
>>>>
>>>>
>>>
>>>
>
> --
> -andy
> andylevy@yahoo.com
> Maintainer, DML FAQ - http://www.dakota-truck.net/faq/
> http://home.twcny.rr.com/andylevy/dakota/
> '99 CC 4x4 318 auto
-- -andy andylevy@yahoo.com Maintainer, DML FAQ - http://www.dakota-truck.net/faq/ http://home.twcny.rr.com/andylevy/dakota/ '99 CC 4x4 318 auto
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