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Tire Size Question 2001 Dakota

From : fearless fred

Q: hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred .

Replies:

From : fearless fred

thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable fred fearless fred wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred mine came with 265/70-16. when i bought tires last time that size wasnt available. i got 275/70-16. speedometer seems pretty accurate. i havnt checked it against a gps. but timed across a measured 10 mile stretch seems to be pretty accurate. -------- .bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota sport qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. .

From : christopher d thompson

on mon 29 sep 2008 091422 -0400 peterd wrote on sun 28 sep 2008 225823 -0400 fearless fred fjxallen@shaw.ca wrote thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable 2001 id say what gear... g yup program change. -- chris .

From : peterd

on sun 28 sep 2008 225823 -0400 fearless fred fjxallen@shaw.ca wrote thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable 2001 id say what gear... g fred fearless fred wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred mine came with 265/70-16. when i bought tires last time that size wasnt available. i got 275/70-16. speedometer seems pretty accurate. i havnt checked it against a gps. but timed across a measured 10 mile stretch seems to be pretty accurate. -------- .bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota sport qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. .

From : mac davis

on sun 28 sep 2008 225823 -0400 fearless fred fjxallen@shaw.ca wrote i went through this with my service manager at cryco and he advised against it.. he said that it would cost a minimum 1 hour labor to reprogram the computer and it would make it close.. he said that 3% was already fairly close so save the bucks.. in our case we know that if it indicates 66 were doing slightly under 70 so were not really in ticket territory.. thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable fred fearless fred wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred mine came with 265/70-16. when i bought tires last time that size wasnt available. i got 275/70-16. speedometer seems pretty accurate. i havnt checked it against a gps. but timed across a measured 10 mile stretch seems to be pretty accurate. -------- .bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota sport qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. mac please remove splinters before emailing .

From : peterd

on mon 29 sep 2008 134534 +0000 christopher d. thompson nospam@nospam.nospam wrote on mon 29 sep 2008 091422 -0400 peterd wrote on sun 28 sep 2008 225823 -0400 fearless fred fjxallen@shaw.ca wrote thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable 2001 id say what gear... g yup program change. i guess in fairness we should tell him how to do that programming change right g .

From : fearless fred

so i guess im showing my age ... used to be slipping a different gear on the end of the speedo drive cable at the transmission end of the cable was the fix for this. gathering that the speedo is now driven by a sensor did a calc on a web site ...seems that the program i have was set for the standard tire size on standard cab two wheel drive. still have a 10% error ... so i have to see a dealer to get this fixed when will we be able to do this ourselves with a laptop pc fred on sun 28 sep 2008 225823 -0400 fearless fred fjxallen@shaw.ca wrote i went through this with my service manager at cryco and he advised against it.. he said that it would cost a minimum 1 hour labor to reprogram the computer and it would make it close.. he said that 3% was already fairly close so save the bucks.. in our case we know that if it indicates 66 were doing slightly under 70 so were not really in ticket territory.. thanks for the info guys. i used a gps to help determine the under read on my odometer. wondering if the fix is a simple gear head change on the end of speedo drive cable fred fearless fred wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred mine came with 265/70-16. when i bought tires last time that size wasnt available. i got 275/70-16. speedometer seems pretty accurate. i havnt checked it against a gps. but timed across a measured 10 mile stretch seems to be pretty accurate. -------- .bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota sport qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. mac please remove splinters before emailing .

From : tom lawrence

gathering that the speedo is now driven by a sensor yep... the pcm learns vehicle speed by getting a signal from the abs computer which is reading a signal from a hall effect sensor called the vehicle speed sensor mounted on the top of the rear differential. next to the ring gear is a tone ring and thats what excites the sensor. the pcm is then programmed with a value referred to as the pinion factor. this is a number that when multiplied by the pulse-per-second value of the signal coming from the abs computer translates into distance travelled. its essentially an expression of the tire diameter because speed is measured by the amount of rotation at the rear axle gear ratios either transmission or differential dont come in to play. still have a 10% error ... so i have to see a dealer to get this fixed either that or rent the specialized scan tool and do it yourself. rental runs $150. a dealer wouldnt charge you that much. when will we be able to do this ourselves with a laptop pc probably never. there are some programmers in the aftermarket that in addition to letting you tune for more performance also let you mess around with the pinion factor setting. however these are bought - not rented and are at least 3-4 times the cost of the tool rental and 7-8 times what a dealer would should charge you for this. .

From : steve w

tom lawrence wrote can you elaborate on the specialized scan tool ... what would i be asking for its called a drb iii and its a proprietary tool that costs about $6k to buy http//millerspecialtools.spx.com/pdf/dc05-157.pdf or $150 to rent for 3 days from techauthority.com the genisys will also adjust pinion factor. $1500.00 or so for one on the bay. they are dropping in price because otc has come out with an even neater toy... -- steve w. .

From : fearless fred

thanks tom for sharing you knowledge on this one. can you elaborate on the specialized scan tool ... what would i be asking for thanks again. fred gathering that the speedo is now driven by a sensor yep... the pcm learns vehicle speed by getting a signal from the abs computer which is reading a signal from a hall effect sensor called the vehicle speed sensor mounted on the top of the rear differential. next to the ring gear is a tone ring and thats what excites the sensor. the pcm is then programmed with a value referred to as the pinion factor. this is a number that when multiplied by the pulse-per-second value of the signal coming from the abs computer translates into distance travelled. its essentially an expression of the tire diameter because speed is measured by the amount of rotation at the rear axle gear ratios either transmission or differential dont come in to play. still have a 10% error ... so i have to see a dealer to get this fixed either that or rent the specialized scan tool and do it yourself. rental runs $150. a dealer wouldnt charge you that much. when will we be able to do this ourselves with a laptop pc probably never. there are some programmers in the aftermarket that in addition to letting you tune for more performance also let you mess around with the pinion factor setting. however these are bought - not rented and are at least 3-4 times the cost of the tool rental and 7-8 times what a dealer would should charge you for this. .

From : tom lawrence

can you elaborate on the specialized scan tool ... what would i be asking for its called a drb iii and its a proprietary tool that costs about $6k to buy http//millerspecialtools.spx.com/pdf/dc05-157.pdf or $150 to rent for 3 days from techauthority.com .

From : peterd

on tue 30 sep 2008 185427 -0400 fearless fred fx08allen@shaw.ca wrote thanks tom for sharing you knowledge on this one. can you elaborate on the specialized scan tool ... what would i be asking for any scan tool capable of reprogramming a chrysler ecm/pcm... g there are a few though they are generaly *very* expensive. check out http//autoenginuity.com/products.html im not saying that their tool or the advanced add-on will do what you want but i think it does. i know for gm diesel engines/powertrain work the autoenginuity tool works very well and is the way to go. at least autoenginuity wont cost as much as your truck did! bg .

From : fearless fred

thanks very much for the tips and links guys .... going to check them out. fred on tue 30 sep 2008 185427 -0400 fearless fred fx08allen@shaw.ca wrote thanks tom for sharing you knowledge on this one. can you elaborate on the specialized scan tool ... what would i be asking for any scan tool capable of reprogramming a chrysler ecm/pcm... g there are a few though they are generaly *very* expensive. check out http//autoenginuity.com/products.html im not saying that their tool or the advanced add-on will do what you want but i think it does. i know for gm diesel engines/powertrain work the autoenginuity tool works very well and is the way to go. at least autoenginuity wont cost as much as your truck did! bg .

From : bob

fearless fred wrote thanks very much for the tips and links guys .... going to check them out. fred on tue 30 sep 2008 185427 -0400 fearless fred fx08allen@shaw.ca wrote thanks tom for sharing you knowledge on this one. can you elaborate on the specialized scan tool ... what would i be asking for any scan tool capable of reprogramming a chrysler ecm/pcm... g there are a few though they are generaly *very* expensive. check out http//autoenginuity.com/products.html im not saying that their tool or the advanced add-on will do what you want but i think it does. i know for gm diesel engines/powertrain work the autoenginuity tool works very well and is the way to go. at least autoenginuity wont cost as much as your truck did! bg you can also use a superchips tuner. it might cost you less than a dedicated scan tool. but you also get the capability to update the tune on your ecu. that alone is worth the price of admission. my truck http//www.superchips.com/products.phppk=1&pvk=1&cmk=748&pname=dodge+ram%2c+dakota%2c+durango+%26+jeep+grand+cherokee although my truck has a differant engine i will say that a retune made a huge differance in performance. -------- ..bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. .

From : bob

fearless fred wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred mine came with 265/70-16. when i bought tires last time that size wasnt available. i got 275/70-16. speedometer seems pretty accurate. i havnt checked it against a gps. but timed across a measured 10 mile stretch seems to be pretty accurate. -------- ..bob 2006 fxdi hot rod 2008 mustang coupe 2001 dodge dakota sport qc 5.9/4x4/3.92 1965 ffr cobra - 427w efi damn fast. .

From : mac davis

on sun 21 sep 2008 205034 -0400 fearless fred fx08allen@shaw.ca wrote hi all! purchased a 2001 dakota club cab sport with the 4.7l and awd. it has 16 inch aluminum wheels with p265r70 tires. speedo is under reading by about 10 per cent. does anyone know if 16 inch wheels an option on these trucks any info greatly appreciated. tia fred fred... we have an 01 dak 4.7/2wd/3.55 gears and 16 stock-slt wheels.. tire size is 255 65 and according to our gps the speedo is dead on.. our 99 ram has 1 size up tires and is 3% off... mac please remove splinters before emailing .