Re: [Chrysler300] 14" to 15" - speedometer cable gear?

[Edward Mills Antique Tractors <millserat@xxxxxxxxxxxxx>]

Its not the wheels but the tires on the wheels - need to know the 
circumference of tires. If you are changing from 14" to 15", you can 
match dia fairly close.

For example an original 8.50-14 would have been about 28.3 inch OD 
(varies slightly by brand and grade). 9.00-14 would have been 28.6 to 
about 28.8. Current P225/75R15 also shows 28.0 to 28.3 in. Current 
P235/75R15 shows 28.6 to 28.9 in OD. Note that a well worn tire would be 
about 16/32 or 0.5 in smaller or about 1.5 % difference on speedometer.

Or if you already have tires and know you are 8% off, you can either 
change tires or rear end gears or speedo gearing but if you are only 
changing the 19 tooth gear, 1 tooth is a bit over 5%, 2 teeth is a bit 
over 10% - so you probably need to look at tire dia / circumference too.

On 6/29/2011 11:26 PM, 2HsandaHeritage@xxxxxxxxxxx wrote:
>
>
>
> Hi Group,
>
>
>
> When changing from 14" wheels to 15", what needs to be done to correct 
> the speedometer/odometer readings?
>
> The plastic gear on the end of the speedometer cable that fits into 
> the 727 on my H (15") is clear plastic and has 19 teeth.
>
> The same gear on my sport (14") is light blue and also has 19 teeth.
>
> The speedometer/odometer readings on my H are off by only 0.2%.
>
> The readings on my sport (with 15'' wheels installed) are off by about 
> 8%.
> Also both vehicles have a 323 rear end.
>
> Help!
>
>
>
> Doug Warrener
>
> [Non-text portions of this message have been removed]
>
> 


[Non-text portions of this message have been removed]



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