tires

15

Asked by Feb 14, 2009 at 04:14 PM about the 1997 Dodge Ram 1500

Question type: Car Customization

why is i tthat the 1997 dodge is the onlt year were if u put big 35' tires on your truck when ur driving the tires are goign slower than the tranny and it reves at like 4 to 5000 rpms its stupid why they dont have any thing to over ride it liek really coem on do you no any thign about this ????

3 Answers

5

it sounds to me to be a tranny issue, not an issue with the size of the tires. your rpms will average a little higher because of the larger diameter of the tires, but not 4-5000. i have 37's on my truck and going down the highway at 75 my rpms are at 3000.

7,895

Generally larger tire diameters reduce engine RPM... If it's going up it means something is slipping... I'm guessing you have an auto... There are a handful of things that can be done. Easiest is to put a more appropriate tires size for your drivetrain on. Next to that I'd look at either a replacement or kit to bring your rear-end ratio higher. I don't know whats available for your truck so you'll have to do some searching, or I'd try asking on a ram enthusiast forum, maybe they know a flaw with your vehicle I'm not aware of, but it sounds to me like your slipping due to the increased load and rotating mass. Good luck.

3,575

The larger tire is like swapping in a lower numeric rear axle ratio. (Example 3.55-1 to a 3.23-1) That puts additional load on the transmission which could put a marginal clutch pack over the edge of slip tolerance. Could also be the Torque Converter clutch. The TCC on my 01 found it's limit when I hooked up the trailer the first time. New converter and trans overhaul cured the problem almost 100K miles ago. Remember the TC and trans are the link between the power and drag. It is the component along with driveshaft and u-joints that is fighting between the pull forward and hold back.

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