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My husband and I just picked up our first Dodge yesterday. It's a bright red 98 4X4 SLT short bed Ram 1500 with about a 3" lift in the rear, it's got giant offroad tires (I haven't measured them yet, so I don't know their size right now) It's also got the stirrup type steps and a custom stereo. 55,400 miles is what we bought it with. It's just beautiful, I love it. It does appear to have a bit of a speedometer discrepency, my husband was following me today and I was going down the road going 55 mph, we stopped and he said "you were really flying down that road", I didn't know what he meant he says "yeah, you were going 70-80mph the whole way" Whoa! just a little bit off. Anybody know how to fix that:???:
 

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Superlift has a calibration device. This was taken directly from their website:

SUPERLIFT ANNOUNCES THE RELEASE OF THE REVOLUTIONARY TRUSPEED SPEED SIGNAL CALIBRATOR

A speed sensor calibrator has finally arrived that addresses the needs of any computer-controlled vehicle running larger (or smaller) diameter tires: The Superlift TruSpeed speed sensor calibrator. The TruSpeed works with any electronic speedometer and hooks up in line with the speed sensor located on the transmission or transfer case of the vehicle. The TruSpeed alters the speed signal at its source, so speedometer reading, ABS function, and transmission shift points are all corrected to work with any non-stock tire diameter. A simple four-wire hookup is all it takes to install the TruSpeed, and comprehensive installation instructions make calibration an easy one-man operation. It not only corrects the speedometer reading to within 1 percent, it can be recalibrated an infinite number of times if future gear ratio and / or tire changes are made to the vehicle. In addition, the TruSpeed can be programmed for two different height settings for those who make seasonal tire changes or those who frequently run two different-height sets of tires on the vehicle (i.e. "street" and "show" tires). The TruSpeed will soon be available for all domestic and import cars, trucks, and vans equipped with an electronic speedometer. For more information, contact your nearest Superlift dealer or call the company's sales / tech line at 800/551-495



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1998 Dodge Ram 1500 Quad-Cab SLT 4X4 SB, 5.2L V8, 5" SkyJacker Stage II Kit, 35/12.50/15 Good~Year MT/R's on 15X8 Weld Racing Sidewinder Wheels, Flowmaster Cat-Back Exhaust System, Custom Audio System.
 

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Right now, this is the only device out there that can recalibrate your speedometer, odometer, etc. if you own a Dodge! The good thing is that you can change your calibration anytime you change your tire size or gear ratio...

For more information, visit Superlift's website:
http://superlift.com/
 

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the dealer can correct your speedo as well. he can go in and alter the pinion factor in the computer, theyll charge you for an hours labor to do. only bad thing is if you change tires you have to have it redone, unlike the truspeed where you can change it or switch the settings to the second one.
 

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Just get the truspeed. It is easy and completey adjustable.

You can switch between tire sizes with the flip of a swith.

Just my experience running two different tire sizes.
 

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ya, i've been going like that for a while now. i didn't even think about it until my friend in his neon told me he was going about 70 in a 55 to keep up. my speedo was saying only 63. now i have just made some reference points on my reading and actual, and try to adjust for it. i know on my cougar that you can get a new speedo gear that is calibrated for different tires, and different rear end ratios. good luck with it, oh, and that excuse does not get you ouf of a speeding ticket as i found out. :):
 

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The reason your speedo is off, is because of the larger tires, dependent upon which tires you are running. The largest tire that the computer can be calibrated to is a 285/75-R16, other than the 17's on the offroad package (which are about the same size as a 285 series tire). A truespeed sensor will help ya out with that, but you need to figure out which size tire there is mounted on your truck. The 3" lift in the back sounds more to me like the factory block. If there was a 3" lift in the rear, you would have a SERIOUS forward rake if there was no 3" lift in the front. Read on the side of the tire, it will tell you the size tire you have on the truck. Let me know if I can be of further assistance.

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Steve

'00 1500 QC 4x4 Black Sport 5.9l Rhinolining, 3" Perf. Acc. Body lift, 5" Skyjacker Class II Single Flex lift, 16-35/15 Boggers on ARE 767 15x10's, 4.56's stuffed in the axles, Powertraxx Locker


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