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Search: Posts Made By: Switchfoot
Forum: 4x4 01-23-2009, 11:40 AM
Replies: 51
Views: 47,098
Posted By Switchfoot
Re: Speedo Correction for Larger Tires

It just dawned on me. I'll bet the PCM won't accept that low a tire RPM number (big tires turn slower) so they can't just use 601 and 4.10 axle ratio so they have to use a bigger RPM number for a...
Forum: 4x4 01-23-2009, 11:34 AM
Replies: 51
Views: 47,098
Posted By Switchfoot
Re: Speedo Correction for Larger Tires

Not sure how it actually works Adventureduo. I think it has to do with the fact that the van PCM won't recognize the larger tires and between changing the revolutions per mile (RPM) value and the...
Forum: 4x4 01-23-2009, 08:26 AM
Replies: 51
Views: 47,098
Posted By Switchfoot
Speedo Correction for Larger Tires

I got the following info from Heber at SMB to reprogram the van computer to make the speedometer read accurately for 315/70-17 tires.

The numbers we use to recalibrate the PCM are as follows...
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