4.10 gears installed...fuel economy increase :)
#31
12-15-2007 | 03:50 AM
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From: Colorado
Originally Posted by scott1981
The weight of the 20's can be almost 2x that of the 17's, that alone makes the truck accelerate slower & downshift more.
Here's an example:
Toyo 265/60-18's: 45 lbs
Toyo 275/55-20's: 41 lbs
Toyo 255/70*17's: 42 lbs
If the rim is 5-7 lbs heavier between an 18"/17" and 20" size (which in most cases is the reverse for many aftermarket cast aluminum wheels as the stock rims are heavier), the difference in sprung mass is nearly the same, especially if the original wheel is steel.
#32
12-15-2007 | 06:12 AM
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From: HI
I have had my 4.56's installed for over a month now and am on my 2nd tank of gas (1/2 through 2nd tank). After the 1st tank my mileage only increased by .1 mpg, not quite what I was expecting. The power increase is great though and just the other day (after I passed the initial 500 mile mark on the gears) I punched it and actually spun the tires. The road was slightly wet from a recent rain though so that probably helped some, but I hadn't felt my truck respond like that since, well ever. I'll report what my mileage is after the 2nd tank, but all my driving is stop-n-go so I feel I'm not seeing what I would be seeing if I were still doing mostly mixed driving.
#33
12-15-2007 | 08:55 AM
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Originally Posted by ramnj
That's good to hear. My only concern would of been if it didn't make any noise before installing the gear.
Did you take it to the dealer just to make sure? You just want to make sure to prevent an expensive repair down the road.
Did you take it to the dealer just to make sure? You just want to make sure to prevent an expensive repair down the road.
Have you ever heard a slight whine going from 1st to 2nd gear? It's similiar to that only lasting the whole time at higher speeds.
#34
12-15-2007 | 11:34 AM
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From: Austin Texas
#36
12-16-2007 | 09:52 AM
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Originally Posted by crash_lucky13
honestly, i HAD a whine... it took about 3-4k on the new gears (mileage) to get it to stop.....
HHMM...I'm probably getting close to 2k on them. Hopefully it will die down.
I did take it back to the shop and drove the manager around on the street. It was embarrassing there because there was so much traffic around causing noise you really couldn't hear anything but my exhaust. I also didn't get over 55. You hear it most at speeds around 75-85.
#37
12-16-2007 | 10:08 AM
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From: Colorado Springs
Originally Posted by JeremyGSU
Well, I have had my new Precision 4.10 gears installed for 1500 miles now and so far the fuel economy doesn't seem to be decreasing, it seems to have increased from what I was getting before.
When I originally bought the truck it had the OEM 18's on it but then I went and bought the 20's and that killed the power and a little in fuel as well. Not only that but with the stock 3.55's, custom 2.5" exhaust/Mag muff, k&N drop in, and Edge on level 3 the truck couldn't do anything on the highway without unlocking the torque converter constantly. With the new gears and same mods the truck can accelerate without having to do so.
I monitored my last 5 tanks of gas before I got the gears and I have kept track of two tanks since the gears. I've pretty much done similiar acceleration between all tanks around 25-30% according to Edge APP monitor.
Before gears were as follows: Miles / gallons put in I do a combo of city/highway driving.
351/24.2 = 14.5
321/23.5 = 13.65
355/23.4 = 15.17
365/24.5 = 14.89
374/27.9 = 13.4 yuck
After gears first tank
395/25.2 = 15.67
And then I just drove up to Atlanta on Wed. from Orlando - a 480 mile trip.
479/27.7 = 17.29 - pretty damn good I think. I had it on cruise whenever I could. Obviously I got slowed down with construction and the traffic but whenever I could I had it on cruise at 80-82. RPM's while at 80 are at 2415 ish
Anyhow, I just wanted to say getting gears doesn't necessarily look like a fuel economy loss depending on what you go with. I'm going to keep monitoring it to see if it stays this way. In hind sight I would have gone 4.56. While the 4.10's are nice they didn't quite give me the performance jump in acceleration I was hoping for. The only thing I don't like about the gears is they make a slight wine the majority of time you're driving. It gets kind of loud between 40-50 but dies down again but while you're crusing at 80 you can certainly hear it. Maybe I'll feel diffrently when I get my Troyer tuned Xcal3 and AF1 3.5" installed next week. We'll see.
Here's my truck incase you're wondering if it's lifted, etc. Nope Truck is '06.
When I originally bought the truck it had the OEM 18's on it but then I went and bought the 20's and that killed the power and a little in fuel as well. Not only that but with the stock 3.55's, custom 2.5" exhaust/Mag muff, k&N drop in, and Edge on level 3 the truck couldn't do anything on the highway without unlocking the torque converter constantly. With the new gears and same mods the truck can accelerate without having to do so.
I monitored my last 5 tanks of gas before I got the gears and I have kept track of two tanks since the gears. I've pretty much done similiar acceleration between all tanks around 25-30% according to Edge APP monitor.
Before gears were as follows: Miles / gallons put in I do a combo of city/highway driving.
351/24.2 = 14.5
321/23.5 = 13.65
355/23.4 = 15.17
365/24.5 = 14.89
374/27.9 = 13.4 yuck
After gears first tank
395/25.2 = 15.67
And then I just drove up to Atlanta on Wed. from Orlando - a 480 mile trip.
479/27.7 = 17.29 - pretty damn good I think. I had it on cruise whenever I could. Obviously I got slowed down with construction and the traffic but whenever I could I had it on cruise at 80-82. RPM's while at 80 are at 2415 ish
Anyhow, I just wanted to say getting gears doesn't necessarily look like a fuel economy loss depending on what you go with. I'm going to keep monitoring it to see if it stays this way. In hind sight I would have gone 4.56. While the 4.10's are nice they didn't quite give me the performance jump in acceleration I was hoping for. The only thing I don't like about the gears is they make a slight wine the majority of time you're driving. It gets kind of loud between 40-50 but dies down again but while you're crusing at 80 you can certainly hear it. Maybe I'll feel diffrently when I get my Troyer tuned Xcal3 and AF1 3.5" installed next week. We'll see.
Here's my truck incase you're wondering if it's lifted, etc. Nope Truck is '06.
Jeremy....what size tires you running? Was your factory 275/65/18?
#39
12-16-2007 | 10:57 AM
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From: Simi Valley CA
Originally Posted by SuperSlabCab
Alot of this is decieving.
I have STOCK 4:10's, and my mileage sucks.
For those with higher rolling masses, I can understand why your mileage suffers, because you need to burn more gas getting that weight up to speed.
I was considering going to 20's, but it sounds like 18's is the cut-off.
Makes going with a Gear Vendors more realistic.
I have STOCK 4:10's, and my mileage sucks.
For those with higher rolling masses, I can understand why your mileage suffers, because you need to burn more gas getting that weight up to speed.
I was considering going to 20's, but it sounds like 18's is the cut-off.
Makes going with a Gear Vendors more realistic.