3.73 gears vs. 4.88 gears at 2000 rpm - Diesel Forum - TheDieselStop.com
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6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.

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Old 04-27-2007, 01:20 AM   #1 (permalink)
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3.73 gears vs. 4.88 gears at 2000 rpm

Well I decided I liked the new 2008's so much I bought an F350 with 3.73 gears to go along with my F450. The F350 has 3.73 gears with 20 inch tires on it. At 2000 rpm the F450 with 4.88 gears and 19.5 inch tires is going 55 mph. The F350 at 2000 rpm is going 75 mph. No wonder the F450 only gets about 13 mpg running empty on highway. The meter on the F350 is saying it is getting 17.5 mpg running empty on the highway. I will do hand calculations on the F350 after I get about 3500 miles on it.

I figure any truck that has a chance of shooting flames out the exhaust I should own at least two of. [img]/ubbthreads/images/graemlins/smile.gif[/img]

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Old 04-27-2007, 07:21 AM   #2 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

Damn, another standard is set! [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 04-27-2007, 08:18 AM   #3 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

How 'bout some pix?

Shawn [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 04-27-2007, 09:19 AM   #4 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

What a rotten post. Rubbing it in real bad, some of us poor blokes can only convince the Mrs. we really, really need a '08 and there you are with TWO!. I have to settle for a Toyota Matrix as my second car. It's fuel mileage is 32-34mpg on the highway and it spins 2600RPM at 70mph. I wish I could keep my '04 F-250PSD(yes the lowly 6.0(fantastic engine) and have the F-450 with 4:88's, too. The 250 for towing the boat and the little fiver, reserving the 450 for those big tow duties.
At least you could supply some pics. of the two beauties(and please do not include any pictures of your gloating grin [img]/ubbthreads/images/graemlins/biggrin.gif[/img]).
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Old 04-27-2007, 12:52 PM   #5 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

Yeah. You got some nerve.

[img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 04-27-2007, 03:28 PM   #6 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

[ QUOTE ]
Well I decided I liked the new 2008's so much I bought an F350 with 3.73 gears to go along with my F450. The F350 has 3.73 gears with 20 inch tires on it. At 2000 rpm the F450 with 4.88 gears and 19.5 inch tires is going 55 mph. The F350 at 2000 rpm is going 75 mph. No wonder the F450 only gets about 13 mpg running empty on highway. The meter on the F350 is saying it is getting 17.5 mpg running empty on the highway. I will do hand calculations on the F350 after I get about 3500 miles on it.

I figure any truck that has a chance of shooting flames out the exhaust I should own at least two of. [img]/ubbthreads/images/graemlins/smile.gif[/img]

Marc

[/ QUOTE ]

Fine, fine. Just great Cram. Now I gotta go back to the dealership and get me a 650. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 04-27-2007, 10:38 PM   #7 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

[ QUOTE ]
I figure any truck that has a chance of shooting flames out the exhaust I should own at least two of. [img]/ubbthreads/images/graemlins/smile.gif[/img]

[/ QUOTE ]

That's the best thing I've heard all day. [img]/ubbthreads/images/graemlins/grin.gif[/img]

Congrats on the 2 flamethrowers you daredevil you. [img]/ubbthreads/images/graemlins/smokin.gif[/img] (insert jealous icon here)
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Old 04-28-2007, 10:00 PM   #8 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

Thanks for the info. Are these auto's or sticks? My 02 stick turns 2000 at 72 with stock 16" rims.
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Old 04-29-2007, 02:29 AM   #9 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

Well it has been a long couple days since I put this post up on the board. Both trucks are automatics for the guy that ask that question. I had to call road side assistance on Friday afternoon and have the F450 towed back to the dealer. I was driving down the road and suddenly the engine lost all power then it made a rude sound. I just had enough momentum to get it safely off the road with the goosneck trailer I was pulling. I was thinking that this must be what happens when the exhaust overheats an the truck automatically powers down. But then I realized I have not done the reflash on this truck yet. I really felt like this was some problem with the electrical. Once I got it to the dealer we realized that the anti-theft system may have been the culprit. The little security icon is flashing when the key is turned on and the truck will not turn over. Apparently the keys transmit a secret squirrel code and you are not supposed to have two of these keys on the same key chain. It was so late in the day Friday when I got there that we were not able to hook the truck to the computer that disarms the security device. I'll know alot more on Monday and will make an separate post on the final outcome.
I ruined a tire on the F350. I got a flat out in the mountains and did not realize it and spun the tire off the rim. Anyhow I guess that's what I get for thinking I was allowed to buy two trucks.
Marc
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Old 04-29-2007, 07:19 AM   #10 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

Holly Toledo, who would have thunk it? Two key fobs cancelling each other out? Hopefully that won't happen with a mix of Toyotas and Furd keys. Lets keep our fingers crossed that that was the culprit. Do you think we will have a video of this shutdown posted on YouTubes, instead of flames shooting out, will just have the two key fobs dangling from the ignition. About that F-350 tire, I take it your 350 is also a DRW? Did you hit something to cause the tire to fail? I have been thinking of getting that tire inflation monitoring system, might not be a bad idea. Are all the tires, both trucks, Continentals? I was hoping for BFGoodrich's
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Old 04-29-2007, 10:20 AM   #11 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

CaptSkup,
I'm really hoping also that it is the security system. If it is not that my next guess would be that the computer in it is fried. The F350 is a single rear wheel with Goodyear tires on it. The F450 has Continentals on it. The spare on the F350 was an 18 inch Continental versus the 20 inch Goodyears that came on the truck. Although I believe the spare is the same outer height as the 20 inch tires. All tires on the truck are 275 R XXXX.
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Old 04-29-2007, 10:48 PM   #12 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

[ QUOTE ]
CaptSkup,
I'm really hoping also that it is the security system. If it is not that my next guess would be that the computer in it is fried. The F350 is a single rear wheel with Goodyear tires on it. The F450 has Continentals on it. The spare on the F350 was an 18 inch Continental versus the 20 inch Goodyears that came on the truck. Although I believe the spare is the same outer height as the 20 inch tires. All tires on the truck are 275 R XXXX.
Marc

[/ QUOTE ]

Do all F350's/Superduties come with different size and brand spare tires vs the one that are on the ground?
I quess they changed the owners manual where you were once able to rotate all tires including the spare in the rotation. Maybe the mismatched spare is the new donut tires to save weight. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 04-29-2007, 10:51 PM   #13 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

I'm pretty sure all Superduties with alloy wheels come with a plain jane steel spare; both our pickups did. They haven't recommended 5-tire rotations since the days of bias-ply tires. Radials are supposed to keep rolling in the same direction, which means simple front-back rotation on each side, and leave the spare alone.

Duncan
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Old 04-29-2007, 10:58 PM   #14 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

[ QUOTE ]
I'm pretty sure all Superduties with alloy wheels come with a plain jane steel spare; both our pickups did. They haven't recommended 5-tire rotations since the days of bias-ply tires. Radials are supposed to keep rolling in the same direction, which means simple front-back rotation on each side, and leave the spare alone.

Duncan

[/ QUOTE ]

You mean you are not to criss cross tires during a rotation either? I need to read up on the manual. [img]/ubbthreads/images/graemlins/vulnerable.gif[/img]
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Old 05-02-2007, 06:10 PM   #15 (permalink)
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Re: 3.73 gears vs. 4.88 gears at 2000 rpm

[ QUOTE ]
They haven't recommended 5-tire rotations since the days of bias-ply tires. Radials are supposed to keep rolling in the same direction, which means simple front-back rotation on each side, and leave the spare alone.

[/ QUOTE ]

No. Not according to my Owner's Guide. Granted, my pickup is getting long in the tooth, but it's 20-or-so years later than when bias-ply tires were common. [img]/ubbthreads/images/graemlins/cool.gif[/img]

For a 5-tire rotation:
spare to right rear
right rear to right front
right front to left rear
left rear to left front
left front to spare.

But yes, the spare wheel is a cheap rusty iron thing, so if you're going to do a 5-tire rotation you need to invest in another alloy wheel.

For a 4-tire totation:
Both rear tires to the front on the same side
Left front to right rear
Right front to left rear

I haven't looked at the 2008 Owner's Guide, but the spare matches the other tires if you get 17" or 18" BSW. If you get 20" tires, the spare will be 18". If you get OWL tires, the spare will be BSW.

So with 20" tires, you have to do a 4-tire rotation.

If you get OWL tires, then the first time you do a 5-tire rotation, turn the BSW out and the OWL in. Or if you can't live without the OWL, then just do a 4-tire rotation.
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