3.92 rear failed,new 3.55, new tune? BAD Fuel Milage!
#11
03-25-2010, 04:20 AM
Join Date: Mar 2010
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
#12
03-25-2010, 04:37 AM
Veteran
Join Date: Feb 2010
Location: Kempner, Texas
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
I didn't lose any mileage and I have 4.56's. you may actually see an increase with 4.10's, lots of people do. Heres a link to where I got my gears
http://airram.com/parts.php?categoryid=343
http://airram.com/parts.php?categoryid=343
#14
03-25-2010, 09:26 AM
And I agree, 4.10s are the best ratio for tires up to 33", anything bigger than that and it's 4.56s...
Tough to say on gas mileage, but I know a Hemi has a "sweet spot" at around 2000-2200 rpms where it seems to get better fuel economy than if it were down at say 1600-1800 rpms.
Air Ram, Moe's Performance, 4 Wheel Parts or Randy's Ring and Pinion are about the best places to get them...
Last edited by HammerZ71; 03-25-2010 at 09:35 AM.
#15
03-29-2010, 12:50 PM
Registered User
Join Date: Mar 2010
Location: Warrensburg, MO
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
The OP has a much more fuel efficient engine. It doesn't say whether he has a 4.7 or Hemi in the post, but in either case the design is 20+ years newer than that venerable old LA360 in your truck. A Hemi will produce similar torque and 100 more HP while still getting 25-35% better fuel economy.
Not that I'm bashing your engine, that thing is a tank and with marginal care (and a decent plenum gasket) should last 200,000+ miles. Get a Hughes solution for the plenum problem so it will handle an increase in HP, add a Superchips and 4.56s and you'll have a beast on your hands...
Not that I'm bashing your engine, that thing is a tank and with marginal care (and a decent plenum gasket) should last 200,000+ miles. Get a Hughes solution for the plenum problem so it will handle an increase in HP, add a Superchips and 4.56s and you'll have a beast on your hands...
