Help figuring out gears.

vcassens · Aug 18, 2015

I have a 02 F450 and I am not sure what gears are in it. The tag that is supposed to be on the diff is MIA. The truck will cruse at 20000-2100 RPM at 70 MPH and has 225/75/19.5 tires on it. Is there any other way of figuring out what gears it has other than counting teeth and doing math? Thanks for any help.

uncool · Aug 19, 2015

4.10's or your speedometer is wrong. GPS app on your phone to check speedometer.

Look on the door tag, get the axle code and do a google search.

Not sure in 02 if you could get a 4.10 gear but Ford may have had that option.

gfulton · Aug 19, 2015

That sounds like 3.73's......

B.Warning · Aug 19, 2015

My f550 had 4:88 with the 6spd. At 70mph it was at 2800 rpm and sounded like the rods were beating the *** out of the side of the block. I'd guess you have 4:10 gearing with your numbers.

pdumont01 · Aug 19, 2015

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dieseltron · Aug 19, 2015

3.73. sounds about the same as my SD with 3.73s

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ghohouston · Aug 19, 2015

I bet 3:73's

Powerstroke Man 6.4 · Aug 19, 2015

My 08 F-350 Tow Boss dually with the same size tire with 4.30's cruising at 60 is around 1900-2000 IIRC, is it auto or manual? if its a auto knowing that the 4R and 5R has the same overdrive ratio it will be close. I would guess 4.10's or 4.30's. What's the axle code on the vin sticker?

suprhlr · Aug 19, 2015

My F-450 with a 4.10 gear and same size tire rpm's at 2100 @ 70 mph

vcassens · Aug 19, 2015

suprhlr said:
My F-450 with a 4.10 gear and same size tire rpm's at 2100 @ 70 mph

That is probably what mine has then

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co04cobra · Aug 20, 2015

I don't believe 450-550s were available with 3.73s.

450s may have had a 4.10 option but all most all 550s are 4.88s

tbsimmons · Aug 20, 2015

Put a jack under the rearend.
Mark the drive line and spin the rear tires one revolution while counting the drivel ine revolutions. If its a little under 4 then 3.73, if its a little over 4 then 4.10.
I would bet its 4.10's.

vcassens · Sep 12, 2015

Ok so I have been doing a little googleing and found this link (http://www.fordf150.net/specs/02fsuper.php ) If you scroll all the way to the bottom it will give the maximum trailer weight based on the gear ratio. There isn't any weight listed for 4:10 gears. so would I be correct to assume that it wasn't an option for an 02? If that is correct then I will for sure say I have 4:30 gears. My next option is going to be to pull the rear cover and count the teeth on the ring and pinion and do some math the diff needs serviced anyway LOL

vcassens · Sep 12, 2015

Also is there anywhere else I can find the axle code other than the door tag? mine isn't readable

psduser1 · Sep 12, 2015

Vin number should tell you.

tbsimmons · Sep 12, 2015

Did you do what I said above. If you did the driveline would spin a little less than 4.5 times.

vcassens · Sep 12, 2015

tbsimmons said:
Did you do what I said above. If you did the driveline would spin a little less than 4.5 times.

No not yet i haven't had time lol

psduser1 said:
Vin number should tell you.

How do i figure it out from the vin number?

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uncool · Sep 12, 2015

Write down the vin # and go to your local ford dealer.

They can give you a really nice printout of everything that was on your truck as it left the assembly line.

sootie · Sep 14, 2015

http://researchmaniacs.com/VIN-Number-Lookup/WindowSticker/Ford.html

punch your vin in there...the window sticker will have the gear ratio

vcassens · Sep 16, 2015

sootie said:
http://researchmaniacs.com/VIN-Number-Lookup/WindowSticker/Ford.html

punch your vin in there...the window sticker will have the gear ratio

My window sticker isn't available lol

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