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post #1 of 30 Old 07-17-2007, 06:47 AM Thread Starter
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Hello and two quick questions

Hi I just purchased my first PSD and am glad to have found this forum. I've been reading the last few days and this is my first post. I have a 2001 F350 Crew Cab long bed 2Wd. All stock as far as I can tell. It was a one owner, company owned truck. I'm trying to find out which rear axle ratio the truck has. On the vehicle tag it is blank under axle. I've searched for decoders but can't find one on the Internet for rear axle ratios. The other question: so far the truck runs great and seems tight, except that if I'm accelerating hard I hear a brief high pitched whistle around 2700 rpm close to the shift point. Is this something to be concerned about? TIA.
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post #2 of 30 Old 07-17-2007, 06:59 AM
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Welcome to the org. Im not sure on your problems, but someone will be along to point you in the right direction

2002 F-250 4x4 EC, SRW, SB
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post #3 of 30 Old 07-17-2007, 06:59 AM
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Is it a Dually or Single rear wheel. This will make a difference in your gear ratio.

But typically if it is single rear wheel most likely it will 3.73:1

It was an option to have 4.10:1 on these trucks.

Most likely if you have a dually it will be 4.10:1

Now what you could do is look at the rear diff there should be a tag on it.

Another thing you could do is jack it up. Mark the Driveshaft and the tire. Then put the truck in neutral and spin the tires bay hand. Count how many revolutions the driveshaft makes for one full turn of the tires. Like if the driveshaft turns 3.73 times for 1 revolution of the tires you have 3.73:1 gear ratio.

Another thing you could do is become a premium member 12 dollars for 2 years and you can ask for an oasis report on your truck. That will tell you all the warranty work that was done. It will also tell you quite a bit about your truck.


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2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

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post #4 of 30 Old 07-17-2007, 08:47 AM Thread Starter
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Thanks its single wheel drive. I'm just getting used to it but it seems to have highish rpms when I'm going down the highway around 65, so that's why I was wondering whether it had the lower geared rear end. The tag on the rear end only specified the fluid to be used but I didn't see any ratio. I'll sign up for the premium membership and order the oasis report, thanks.

If anyone has anything to comment on the turbo(?) whistling I hear that would be appreciated.
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post #5 of 30 Old 07-17-2007, 08:53 AM
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Other than the great suggestions gfiven, and assuming you have stock tires....at 70mph my RPMs are right at 2K. If they're 2300-2400, you have the 4.10s.


2001 F250 Ext Cab LB 4x4
7.3L PSD, 4R100
Stock except for DIY Tymar intake and 4" exhaust
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post #6 of 30 Old 07-17-2007, 09:11 AM
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Quote:
Originally Posted by jphelzer View Post
Other than the great suggestions gfiven, and assuming you have stock tires....at 70mph my RPMs are right at 2K. If they're 2300-2400, you have the 4.10s.

Or he has 3.73:1 and his tranny is not shifting into Overdrive.

The turbo whistle is most likely common your just not used to hearing it.


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2004 6.0 destroyed by contaminated fuel

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post #7 of 30 Old 07-17-2007, 09:14 AM
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post #8 of 30 Old 07-17-2007, 09:21 AM
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post #9 of 30 Old 07-17-2007, 09:23 AM
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WELCOME!!! Congrats on the truck!!

Shane

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STOCK!
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post #10 of 30 Old 07-17-2007, 09:52 AM
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Welcome!
You came to the right place to find answers.

2006 F250 Lariat CC 4x2 Southern Comfort Edition I'm finally back home!!! Let the modding begin...
1996 Z28 SS Not so stock...
1957 Chevy Pick-up Nothing is stock anymore...

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