can i change the 4.6 to 5.4 in my 2008 f150 fx2

Asked by Feb 10, 2017 at 12:49 PM about the 2008 Ford F-150 FX2 Sport SB

Question type: Maintenance & Repair

5 Answers

85,625

You can but you would need everything to make it run. You would need the trany to go with that motor, the computer and wiring harness for the engine, figure out a trany mount, may need a drive shaft, stuff like that.

1 people found this helpful.
116,025

I think you can swap out cranks and make your 4.6 a 5.4. The blocks are identical as far as I know. The 5.4 just has a longer stroke.

1 people found this helpful.
116,025

I suspect but don't know for sure that the swap would largely be bolt in with a correct for year 5.4. The engine computer would almost certainly need to be changed though.

23,960

Try checking a parts site for the part number for a new PCM for your 2008 4.6. Do the same for the 5.4 for the model year of that engine. If the part numbers are the same, you may be halfway home. If different, I suspect the pinouts will be completely different and you may even have more pinouts for the 5.4 than the 4.6. Then you will have to follow the suggestions made by the individuals above.

01-06-2018, From; Mike, I do not Know if the 4.6 ,3 valve & 5.4, 3 valve, are Easy to Exchange or Not, I know the Block's are the same as to the Bolt up to the transmission, I do Know the 5.4 Comes from the factory with a More Beefy ( TOUGH ) transmission due to the higher Take off power & Etc, I think I can Change my 5.4 ,3v , to a 4.6 3v, and use the 5.4 trans, Computer, wiring harness, I am planing to use all the 5.4 stuff, and just install the 4.6 Motor & hook every thing back up just like it was a 5.4 I was installing, the Firing Order is the same, the number of valve's are the same, So I am GONA GIVE IT A TRY , IF ANY ONE OUT THERE HAS TRIED THIS AND IT DID NOT WORK -PLEASE POST IT ,,with in the next few week's & I will Post how it turns Out.

Your Answer:

F-150

Looking for a Used F-150 in your area?

CarGurus has 11,263 nationwide F-150 listings starting at $369.

Postal Code:

Ford F-150 Experts

  • #1
    OJ
    Reputation
    10,860
  • #2
    dandyoun
    Reputation
    4,970
  • #3
    tennisshoes
    Reputation
    3,890
View All

Related Models For Sale

Used Chevrolet Silverado 1500
119 Great Deals out of 11,542 listings starting at $4,900
Used GMC Sierra 1500
77 Great Deals out of 11,146 listings starting at $4,499
Used Ford F-250 Super Duty
25 Great Deals out of 900 listings starting at $3,995
Used Toyota Tundra
31 Great Deals out of 1,536 listings starting at $5,495
Used Dodge Ram 1500
27 Great Deals out of 543 listings starting at $2,500
Used Toyota Tacoma
21 Great Deals out of 1,700 listings starting at $5,990
Used Ford Mustang
24 Great Deals out of 1,221 listings starting at $3,995
Used Chevrolet Colorado
7 Great Deals out of 2,479 listings starting at $3,995
Used Nissan Titan
23 Great Deals out of 946 listings starting at $7,995
Used Ford F-350 Super Duty
16 Great Deals out of 1,370 listings starting at $5,500
Used Ford Explorer
24 Great Deals out of 1,792 listings starting at $3,990
Used Chevrolet Silverado 2500HD
13 Great Deals out of 1,372 listings starting at $3,995
Used Chevrolet Tahoe
12 Great Deals out of 869 listings starting at $6,999

Used Cars For Sale

2018 Ford F-150 For Sale
18 Great Deals out of 7,153 listings starting at $24,549
2017 Ford F-150 For Sale
9 Great Deals out of 486 listings starting at $369
2016 Ford F-150 For Sale
15 Great Deals out of 939 listings starting at $18,997
2015 Ford F-150 For Sale
11 Great Deals out of 545 listings starting at $19,900
2014 Ford F-150 For Sale
17 Great Deals out of 467 listings starting at $12,800

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.