The size of Your Wheels is Irrelevant, It’s the Tire Size that am asking

about as that is what defines the OutSide Diameter of the Wheel/Tire Combo ~

        As for Your Van not wanting to go over 4K,,,, That Is Your ECU Not Getting

the info from Your VSS that You are actually moving @ some speed down the Rd.

So either Your VSS Is Not Working Correctly or The Signal It May Be Producing Is

Not Getting To The ECU,,, If VSS Is OK Then The Circuit To The ECU May Be Bad

Or The ECU May Have A Problem ~ I'm not familiar with Your type of XSS as Mine

is the In Speedo type but 4mm of Clearence seems like A Lot for a Hall Sensor to

actually be able to produce a signal ~

> On 1 Feb , 2023, at 9:21 PM, John Rodgers <jrodgers113@GMAIL.COM> wrote:
> 
> Got it. Ring gear in the stock auto tranny is something 4 point something
> or other. The wheels are good old 14 inches. These are new so going to 16
> inches is not in the plans anytime soon.
> 
> On Wed, Feb 1, 2023 at 10:15 PM OlRivrRat <OlRivrRat@comcast.net> wrote:
> 
>> On 1 Feb , 2023, at 12:16 PM, John Rodgers <jrodgers113@GMAIL.COM> wrote:
>> 
>> 
>> What rpm should show on the tach at 70 mph? Mine shows 4000.
>> 
>> 
>> That depends on Transmission Gearing & Tire Size ~
>> 
>>