go to gearvendors.com and you can read up on them. mine was $3,050 with shipping if I remember right. $100 to shortin the driveline. With as much driving as I do, it is DEFINATELY worth it to me. I drive 40,000 miles a year. Pulls everything like it isnt even there. Plus the 3-5 mpg gain is reeally nice A 500 rpm drop on the interstate is VERY kind on the motor and trans. Trans is usually 50* cooler when im pulling. Motor runs butter at the lower rpm too I think. I have 22,000 miles on mine and I love it. Best of ALL worlds. Fuel mileage and the gears to pull.

1997 CTD 2500 4X4 ex-cab long box 235,000 miles, gear vendors 8 speed overdrive, stage 5 TST fuel plate, 4" exhaust, 370 injectors, full DTT auto trans, turbo silencer MIA, X-monitor digital guages, 4:10 gears w/limited slip, new style tow mirrors, stock turbo and pump

 

I have 285/75r/16 and I have 4:10's I wish I could tell you but I don't have a tach yet

 

I dunno if I could justify the 3 grand for a gears vender, because I got a quote from a shop for $850 for 3.54's installed. But I need new rear tires anyway, thats why I'd like to get the gearing through bigger tires to save that extra money. Thanks for the replys so far, keep them coming. And please if anyone has 35's on there 2nd gen dually let me know ur setup, thanks.