Do these really help with shifting points, and speedometer corrections? Or should I just invest in wheel speed sensor from superlift? They both claim to correct the same problems. Does anyone know where the best deal would be for either one?

I also am looking for a spare tire carrier that I can attach to the bumper instead of the tow hitch. Has anyone heard or seen these products? I could put it on top but, I have a thule box carrier on top and I think it would be too tight of a fit, also then I couldn't carry my windsurf boards. [8D]

 

I have a 99 4wd

 

Hypertech programmer doesn't change shift points or speedo settings on the Durango, only on the Ram trucks and some of the Dakotas because of transmission differences. Ebay usually has good deals on them for under $300 bucks.