4.56 gears on the way

[mudryder18]

OK well the grears are in now and i love them. The engine isnt working as hard now. I dont have mpgs yet im still trying to run through some tanks to find out but i do have rpm numbers.
55mph - 1600rpm
60mph - 1750rpm
65mph - 1850rpm
70mph - 2000rpm

 

[panda24619]

what gears did you get? and that sounds about right for my stock gears and tires.

 

[mudryder18]

I got yukon 4.56s front and rear and i am running 38.5s.

 

[KWT2000]

those are good rpm's

i imangine it is easier to drive as well

 

[mudryder18]

those are good rpm's

i imangine it is easier to drive as well

It still drives about the same but yes i can tell that it is much more responsive when i accelerate. And on the highway the rpms are not constantly pegged above 4000. Its likes to stay in 4th gear now cruising.

 

[alaskanexpy]

i got ya'll beat...most of the winter i was getting 7.5mpg! lol

 

[panda24619]

i got ya'll beat...most of the winter i was getting 7.5mpg! lol

but you drove a v10 all winter. cause your expo was in the shop. so thats not a fair comparison! haha

 

[alaskanexpy]

no actually the i've been driving both all winter the expy was only in the shop 10 days. the excursion and expedition were getting 7.5mpg both at the same time! lol a few reasons why though. idle time with remote start, running in 4x4 all the time, 400lbs of weight in the rear, tires aired down to 22psi and i have a VERY heavy foot.

turns out with my driving style i only see 1 mpg difference between the 2 trucks in town. but on the highway the expy wins by atleast 2-3mpg.

glad your happy with the gears! i would love some 4:10s or 4:56s in mine. i know i'd loose all top end since i only run 265's but i'd love to have the low end power.

 

[clardy]

hey mudryder,

did you ever get some good fuel mileage numbers after your gear swap i pick my truck up from the shop on tuesday and then i will begin cannibalizing the fender wheels to accomodate the 38s i am going with on my rig... i am going with 4.56 front and rear with an auburn limited slip and selectable locker in the front with a circuit #104 cut off switch so that i will have true 2wd mode (i have a 2000 so it doesn't have that selection stock) another thing is which superchips programmer did you go with the flashpaq or the cortex?

 

[mudryder18]

Clardy,
yea sorry i havent updated this. I have run through a few tanks now and do have some mpg numbers. 9.5 city and 11.1 highway. Not quite what i was hoping for but it is better than what i was getting before. I have the predecessor to the flashpaq. I have the micro tuner and i am starting to hate it. But if i had to pick between flashpaq and cortex i would go with cortex. I was thinking about switching to edge cts but i am still on the fence. Cant wait to see how ur truck turns out.
Btw, are you back from afghanistan yet?