GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

long haul gearing.

Thread Tools
 
Search this Thread
 
Old 09-07-2011 | 02:40 PM
  #1  
sierra69's Avatar
Thread Starter
On The Tree
 
Joined: Jun 2009
Posts: 182
Likes: 0
From: flagstaff,az
Exclamation long haul gearing.

ok, what gear should i install in my 07 w/t for my trip to montant from here in arizona?i curretly have 3:23s and will be hauling a 12 bolt axle and two fenders in the bed.my cruising speed will be at 70 mph. 3:73s,3:90s or 4:10?
Old 09-07-2011 | 02:42 PM
  #2  
BrutalSierra's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Feb 2011
Posts: 1,309
Likes: 0
From: League City,TX
Default

Sounds like your best with your 3.23's maybe the 3.73's but the 3.90's and 4.10's will just eat gas in the highway.
Old 09-07-2011 | 03:27 PM
  #3  
Atomic's Avatar
I have a gauge for that
iTrader: (42)
 
Joined: Jan 2006
Posts: 16,266
Likes: 394
From: Huntsville, AL
Default

stay with the 3.23s'...
Old 09-07-2011 | 03:57 PM
  #4  
dlt76028's Avatar
12 Second Truck Club
iTrader: (13)
 
Joined: Sep 2007
Posts: 5,883
Likes: 2
From: Crowley, TX
Default

3.73s
Old 09-07-2011 | 05:06 PM
  #5  
charcoal03silvy's Avatar
TECH Addict
iTrader: (1)
 
Joined: May 2009
Posts: 2,387
Likes: 1
From: South OKC/ Moore, OKlahoma
Default

keep what ya got
Old 09-07-2011 | 05:08 PM
  #6  
sierra69's Avatar
Thread Starter
On The Tree
 
Joined: Jun 2009
Posts: 182
Likes: 0
From: flagstaff,az
Default

Sounds good guys, i was thinking 3:23s for the trip,but just wanted a second opinion from you guys here.thank you!
Old 09-07-2011 | 05:15 PM
  #7  
dlt76028's Avatar
12 Second Truck Club
iTrader: (13)
 
Joined: Sep 2007
Posts: 5,883
Likes: 2
From: Crowley, TX
Default

judging by your pic, you have a crew cab, 4.8, with bigger tires, 4sp auto. You definitely need to get your rpms up on the highway. I bet it's going to downshift alot with 3.23s. depending on your tire size I still say 3.73s, to get your rpms around 1800-1900 cruising.
Old 09-07-2011 | 05:27 PM
  #8  
sierra69's Avatar
Thread Starter
On The Tree
 
Joined: Jun 2009
Posts: 182
Likes: 0
From: flagstaff,az
Default

Originally Posted by dlt76028
judging by your pic, you have a crew cab, 4.8, with bigger tires, 4sp auto. You definitely need to get your rpms up on the highway. I bet it's going to downshift alot with 3.23s. depending on your tire size I still say 3.73s, to get your rpms around 1800-1900 cruising.
it does downshift alot and thats what i don't want on this trip.i have a readylift 1.5 leveling kit and run 265s instead of those gimpy 245s.
Old 09-07-2011 | 06:27 PM
  #9  
dlt76028's Avatar
12 Second Truck Club
iTrader: (13)
 
Joined: Sep 2007
Posts: 5,883
Likes: 2
From: Crowley, TX
Default

Originally Posted by sierra69
it does downshift alot and thats what i don't want on this trip.i have a readylift 1.5 leveling kit and run 265s instead of those gimpy 245s.
A custom tune and 3.73s will help a ton.
Old 09-07-2011 | 06:42 PM
  #10  
Mangled03gmc's Avatar
Baltimore Whore
iTrader: (95)
 
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
Default

The stock 23's would be fine on a FLAT haul, but if your running the hills it will def be doing the down shift thing alot.. 73's are a all around good gear.. Remember bigger tires is the same as a higher gear.. So if your bigger then stock tires( height) you will be in theory running a taller gear..


Quick Reply: long haul gearing.



All times are GMT -5. The time now is 04:31 AM.