[dom42]

i really didnt want to go threw all the work of changing gears and still have the rpm's lower than stock. every gear company that i have talked to said the same thing go with the 4.56. its ony going to be 70rpms over stock. i just want to get that bottom end back i had when its was stock.

i have 4.10's w/ 35's. and its almost too much. but i love them. cuz it does pull trailers alot easier. i don't recommend 4.56's because that would be just way too much JMO. i remember reading an article of a guy who was doing 12's on 1/4mile on 4.56's but he was rock'n some 40's. ofcourse his rig was like totally built up for it.

4.10's w/35's pretty much puts you to stock(3.7?'s). not exactly 3.73's but pretty dam close. and the guy is recommending the 4.56's because that''s what they do all day to gas vehicles, and diesel s have way more torque than gas. good luck, but i recommend 4.10's. i still get up to 20mpgs empty on highway at 65mph's and about 12mpgs with a 13000lbs trailer going 55-60mph

 

[dom42]

i see you have a 5.9 i have 6.7 with a six speed. the gear ratio is way different. the 68re is 1:1 in forth gear and .81 for fifth and .62 in sixth. all tire to gear charts are for 1:1 at 65mph. my tire size with 4.56 is 2852rpm's @1:1
then take 2852 x .81= 2310 in fifth
2310 x .62=1432rpm's in sixth at 65mph

stock is [email protected] 1:1 @65mph
2715 x .81= 2199rpm fifth gear
2199 x .62= 1363rpm in fifth @65mph

69rpm diff

Cant argue with that there,you definately have me there on paper. but in real life situation and MY setup, i am at 2755rpm at 66mph........

 

[dom42]

Ive been to well over 10 shops around my area and everyone one has said it would be fuel economy murder to go past 4.10 with anything less than 37"s

thnkx ,was about to mention that........