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Towing 10k with 37's and 4.88's

  #31  
Old 03-06-2018, 10:44 AM
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No, I had 3.73's. I would be willing to sell them, but figured there wasn't much of a market for them. So they are just sitting in the boxes in the garage.
 
  #32  
Old 07-24-2018, 04:40 PM
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Originally Posted by Ron94150 View Post
Speedo is strictly off tire size. But I did have to program the computer for the 4.88s. 4.30, 4.56, and 4.88 are all available in the computer to choose from. Any dealer or shop with IDS can do this. Most hand held tuners can do it, or do it yourself with FORScan.

The truck would want to hold way to high of a gear at low speeds before the reflash.
Bringing an old post back, but I have scheduled to have 4.56 gears installed into my 2014, I think my programmer will do it.. but I haven't looked and am at work, do you know if forscan will let you do 4.56.. I only saw 4.30 and 4.88 as options in forscan, and the Google sheets that are on the main forum dont have gear changes in them.

I'm going to go from my 31's to 33s so I can keep a 4.30 effective ratio going on.. should be quite the change from my 3.73s that I have right now, I have a lot of town and some highway driving so I'm hoping I'll pick up 1 mpg from the gears.

Was really tempted to put a locker in the front while they have it apart.. but decided against the cost for how little I would use it..
 
  #33  
Old 07-25-2018, 11:21 AM
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Wow, been a long while since I've been on here. Been super busy and I had to take a break. 4.56 was definitely an option in the software I used. It was dealer software from the truck shop here at work. I'm not sure about FORScan.
 
  #34  
Old 07-25-2018, 11:27 AM
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Originally Posted by Ron94150 View Post
Wow, been a long while since I've been on here. Been super busy and I had to take a break. 4.56 was definitely an option in the software I used. It was dealer software from the truck shop here at work. I'm not sure about FORScan.
Glad I could drag you back Ron! I'll check out my tuner, pickups sitting on the street, been driving my fuel economy car in the mean time..
 
  #35  
Old 11-07-2018, 05:00 PM
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I know this is a couple months old, but I am looking at 4.56 gears getting installed and I have 33 inch tires. curious how you like it, how it pulls, what your rpms are, and mpg as well!

thanks
nick
 
  #36  
Old 11-07-2018, 05:02 PM
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Originally Posted by Tarster View Post
Bringing an old post back, but I have scheduled to have 4.56 gears installed into my 2014, I think my programmer will do it.. but I haven't looked and am at work, do you know if forscan will let you do 4.56.. I only saw 4.30 and 4.88 as options in forscan, and the Google sheets that are on the main forum dont have gear changes in them.

I'm going to go from my 31's to 33s so I can keep a 4.30 effective ratio going on.. should be quite the change from my 3.73s that I have right now, I have a lot of town and some highway driving so I'm hoping I'll pick up 1 mpg from the gears.

Was really tempted to put a locker in the front while they have it apart.. but decided against the cost for how little I would use it..
I know this is a couple months old, but I am looking at 4.56 gears getting installed and I have 33 inch tires. curious how you like it, how it pulls, what your rpms are, and mpg as well!

thanks
nick
 
  #37  
Old 11-07-2018, 05:47 PM
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Originally Posted by nbonci View Post
I know this is a couple months old, but I am looking at 4.56 gears getting installed and I have 33 inch tires. curious how you like it, how it pulls, what your rpms are, and mpg as well!

thanks
nick
After having my 4.56 gears and 33's for a few months.. I have only put a few tanks through the pickup, I dropped about 1 to 1.5mpg I was averaging around 11.5 to 12.5 with 3.73 and 31's in my around town driving, towing the trailer was about 8 to 9 ish.. I live in the west coast so for me I have to go over 3k foot mountains to go anywhere, having the 4.56 and 33s I like the power, I would say it gets into 6th gear really easy now and pretty much 45 and on I'm in 6th.

If your going to stay with 33s I would suggest 4.30 gears, I am probably going to buy a set of 35s from a buddy and run those for a bit, that was the magic of going to the 4.56 it gave me more gear than I needed for the 33s and just right for the 35s.

For pulling my trailer, I only did a short pull after putting the gears in and it was nice, didn't rev as high and held a gear longer, this weekend I'll pull the truck 90 miles down to the coast, so I will have a better idea after that on how it does going over the hill.
 
  #38  
Old 11-07-2018, 05:55 PM
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Originally Posted by Tarster View Post
After having my 4.56 gears and 33's for a few months.. I have only put a few tanks through the pickup, I dropped about 1 to 1.5mpg I was averaging around 11.5 to 12.5 with 3.73 and 31's in my around town driving, towing the trailer was about 8 to 9 ish.. I live in the west coast so for me I have to go over 3k foot mountains to go anywhere, having the 4.56 and 33s I like the power, I would say it gets into 6th gear really easy now and pretty much 45 and on I'm in 6th.

If your going to stay with 33s I would suggest 4.30 gears, I am probably going to buy a set of 35s from a buddy and run those for a bit, that was the magic of going to the 4.56 it gave me more gear than I needed for the 33s and just right for the 35s.

For pulling my trailer, I only did a short pull after putting the gears in and it was nice, didn't rev as high and held a gear longer, this weekend I'll pull the truck 90 miles down to the coast, so I will have a better idea after that on how it does going over the hill.
what kind of rpms do you see at highway speeds (65/70)? using calculators online i was only seeing about a 100rpm difference between the 4.30 and 4.56. Please let me know how it goes 90 miles down the coast! I am leaning towards the 4.56 since i am not the kind of person who can leave well enough alone, i don't want to rule out a small lift and 35s either.
 
  #39  
Old 11-08-2018, 09:42 PM
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Originally Posted by nbonci View Post
what kind of rpms do you see at highway speeds (65/70)? using calculators online i was only seeing about a 100rpm difference between the 4.30 and 4.56. Please let me know how it goes 90 miles down the coast! I am leaning towards the 4.56 since i am not the kind of person who can leave well enough alone, i don't want to rule out a small lift and 35s either.
I rarely do over 55 and sometimes 65 around here those are the speed limits, but.. here is what you asked for.

Mpg, this fill up it was 10.5 used to be around 11 to 11.5

55 mph - 1800 rpm
65 mph - 2100 rpm
70 mph - 2300 rpm
75 mph - 2500 rpm

I'll let you know how the coast trip goes this weekend.
 
  #40  
Old 11-09-2018, 10:15 AM
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Originally Posted by Tarster View Post
I rarely do over 55 and sometimes 65 around here those are the speed limits, but.. here is what you asked for.

Mpg, this fill up it was 10.5 used to be around 11 to 11.5

55 mph - 1800 rpm
65 mph - 2100 rpm
70 mph - 2300 rpm
75 mph - 2500 rpm

I'll let you know how the coast trip goes this weekend.
Awesome! Thank You so much!
 
  #41  
Old 11-11-2018, 08:12 PM
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Originally Posted by nbonci View Post
Awesome! Thank You so much!
Update number 1. Went and picked up the trailer and then too it over to the coast, and two days of driving to or hunting spot got me to about 200 miles on a tank, so 110 miles with the trailer and roughly 90 without, I averaged 9.1 hand calculated, we have one more day of hunting and then back home and I plan on filling it back up after I drop the trailer ifo, but I would expect about the same going back. This route to the coast doesn't really have any large hills in it. But the truck stayed in 6th gear most of the way and dropped to 4th at one grade, I thought it pulled pretty good, never did I get above 3k rpm the whole trip, just mozzied on over, we were not in a hurry.
 
  #42  
Old Yesterday, 05:31 PM
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Update number 2.. Filled up the pickup and drove the last day of hunting and then drug the trailer back home 90 miles, filled up when we got into town and averaged 9.1 mpg on the way back, we were keeping 55 to 60 and there is a number of twisty roads going down to 40mph in different areas. Tow'ed really well, I do like the extra torque.
 
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