Dude I am going to have to recommend 4.10. It is not much more than 3.90 but it will be better, and don't think your gas mileage is going to be horrible because it won't be. Also the HPP3 cannot program for 3.90. Do what you want, but I think you should consider the 4.10s a little more.

 

Mix is going to have his for sale real soon probably in the next couple weeks. I have a Eaton Posi for sale also....

 

O yeah all you do is a slight adjustmentin tire diameter to get everything correct on the power programmer....

 

hyde I hope you are not selling the locker you are selling me

 

Precision Gear makes a 3.90 for a 8.5 GM.

 

99silveradoSS, our trucks have a 41 tooth ring gear so with a 10 tooth pinion you get 4.10/1 with a 11 tooth 3.73/1 , 12 tooth 3.42/1 if someone makes a 3.90/1 they must use a 39 tooth pinion. I love my 4.10/1 and if I didn't drive so many miles I'd gear it 4.56/1 . At 70 mph it runs @ about 2200 rpm, thats not bad for a 6000 rpm motor. Fuel milage dropped about 1 mpg city & highway (well worth it imo). <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> Jim

 

**** sorry red2gay i forgot you said you wanted it...Twobit....Sorry bro i guess it is sold....

 

Do they make 3.90 gears for our trucks? If so, I think I would like to get some. Wouldn't it be a nice improvement going from stock 3.42 limited-slip posi to 3.90 Eaton posi?

 

yes mix has them