3.55 or 3.73 gears

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Jul 10, 2018 | 02:09 PM

#11

06screwlariat

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3.73 if you can find them, especially if you are putting on larger & heavier tires

Jul 12, 2018 | 02:29 PM

#12

Eric Kleven

Renaissance Honky

Joined: Jun 2016

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From: Mound, MN

Get whatever and re-gear to 4.10 or 4.30 with those tires.

Jun 21, 2022 | 01:40 AM

#13

juanm.adlp

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Hello! I have question. Thanks for your attention

hello! Greetings! One question... I have a 2006 fx4 5.4 with a ratio of 3.73. Recently I had to change the pcm, but when configuring it I had the error of selecting 3.55 as the ratio. Will I have any problem if I keep that configuration? And if so, what would they be? In advance, thank you very much for your attention. 👍

Jun 21, 2022 | 12:31 PM

#14

gDMJoe

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From: Timbuk3, MI

Quote:

juanm.adlp...

Speedometer (and any associated readings thereof - e.g. miles, MPG) will be off by +5%.
Transmission shift points.
.....

Jun 21, 2022 | 05:36 PM

#15

juanm.adlp

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Quote:

Originally Posted by gDMJoe

Speedometer (and any associated readings thereof - e.g. miles, MPG) will be off by +5%.
Transmission shift points.
.....

ok. Thanks so much, friend

Jun 21, 2022 | 05:53 PM

#16

juanm.adlp

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Quote:

Originally Posted by gDMJoe

Speedometer (and any associated readings thereof - e.g. miles, MPG) will be off by +5%.
Transmission shift points.
.....

Sorry, but I am not very expert in relation to transmission shift points, what effect would this do specifically? that felt heavier in acceleration? for instance. And if so, any other signs or symptoms? Thanks for advance

Jun 21, 2022 | 07:59 PM

#17

gDMJoe

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From: Timbuk3, MI

Quote:

juanm.adlp - Sorry, but I am not very expert in relation to transmission shift points, what effect would this do specifically?...

Since the wheels' RPM (Revolutions Per Mile) would be increased, the transmission's shift points would be off by -5% of the PCM's scheduled engine's RPM (Revolutions Per Minute) shifts. meaning: The shifts will be earlier.
.

Jun 21, 2022 | 09:55 PM

#18

juanm.adlp

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Quote:

Originally Posted by gDMJoe

thank so much😁👍

Jun 22, 2022 | 07:30 PM

#19

blkZ28spt

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Joined: Aug 2018

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Quote:

Originally Posted by CamFord2018

I will soon be buying a 2018 f150 xlt and I am undecided on what gear is necessary for me. I will be running 305x55R20 Nitto ridge grapplers which translates to 33.2" tall and 12.44" wide. My only hauling will be on weekends when I go hunting or fishing which only involves a 4wheeler on a 5 by 8 trailer and the boat would be an 18 foot fiberglass. Other than that I won't haul much of anything else. Considering tire size and workload what would you guys recommend? Im leaning toward getting the 5.0L v8 because im old school. haven't ruled out the 3.5L v6 yet though.

Also, I have noticed that it is very hard to find a truck with 3.73 on a lot in Mississippi, tons of 3.55.. not sure why. Anyone know why that is?

Larger, heavier tires and towing with the top heavy (not a ton of low or mid range) 5.0?

More gear.

But buying used, as long as it's not a terrible gear, I don't think you can use 3.55 vs 3.73 to decide which used truck to buy, there will be multiple far more important factors