4.2 swap sorta

oaktonarcher · **4.2 swap sorta**

well as some of you might have noticed i have been wanting a manual for a while now, and now i might have a chance of fixing this problem. i want a 4.2 liter out of a ford f-150 and im guessing the trucks are the same as the stangs 99+ has split ports? and im also guessing that the tranny coming off the 4.2 liter is the t-5? my thought was, after the warrenty comes off i can buy a 4.2 liter already attached to the tranny and drop both in at once with out much extra effort. then i would take the obvious clutch pedal set up and the comp out of the truck and swap it in to the stang. o and i would have to change the shifter handle so i dont mess up the roof of my car

. but my question is, is there some things i am over seeing in all this? will it just be much much easier to buy a 5 spd and then swap in a 4.2?

Tbird232ci · 09-06-2004, 12:06 AM

the intake manifolds for the 4.2 are different, as for the transmission, i have no idea, but the length may or may not be different

im doubting the pedal assembly from the truck would work either

best bet in my opinion is to get all the 5-speed stuff from a stang, get the block, heads, and all that from the truck

oaktonarcher · 09-06-2004, 12:19 AM

could i buy thet tranny and all from a stang and buy the 4.2 from the truck and match them up out side the car and drop them in? how hard is this to do? and would a comp from a v6 stang 5 spd work on a 4.2?

97Stallion · 09-06-2004, 10:23 AM

OK, the tranny won't work as far as I know. I'm almost positive it's not a t-5. And the pedals won't work either. As for the engine, it'll drop right in, but you'll have to remember that the 4.2 blocks have knock sensors, and also the only thing different about the intakes is the upper's split port design. you you can just transfer you upper over. And finally if you have the engine out, now would be the optimal time to do a h/c/i swap. With a 4.2 you're gonna want BV heads at a minumum, and get some highly modified intakes so you can use a 70mm TB, and get them ported and polished. Your best bet for the tranny and engine is to find a junkyard, but still expect to bay close to 1000 or more for the items and then about another 1000 for the h/c/i. And then about another 500 to swap them in. So at a minimum, think around $2500-3000.

Tbird232ci · 09-06-2004, 02:38 PM

yeah, listen to this guy, he knows more about it than i do

oaktonarcher · 09-06-2004, 04:42 PM

i feel stupid but what is a knock sensor? and im not planing on doing this for another couple years. 2 to be exact so i have time to fig all this out and start collecting parts

97Stallion · 09-06-2004, 05:26 PM


Quote: Originally Posted by Tbird232ci yeah, listen to this guy, he knows more about it than i do

Ya listen to me!!

97Stallion · 09-06-2004, 05:36 PM


Quote: Originally Posted by oaktonarcher i feel stupid but what is a knock sensor? and im not planing on doing this for another couple years. 2 to be exact so i have time to fig all this out and start collecting parts

A knock sensor does exactly what it says. The sensor(s) detects slight vibrations in your engine caused by knocking otherwise known as pre-ignition or detonation. When the sensor picks up these vibrations it retards the ignition timing which means it changes the point in which the spark plug fires to reduce/remove the knocking. They're pretty cool to have, but if you want to keep them working in your mustang, you'll need the f-150's computer.

oaktonarcher · 09-06-2004, 06:33 PM

that sounds sweet. but is there any down sides to having a F-150 comp?

97Stallion · 09-06-2004, 06:35 PM

Not if you can tune it

Monkey · 09-06-2004, 07:04 PM

you'll have to reprogram PATS on the F150 engine. just use the stock ECU. you'll be fine.

97Stallion · 09-06-2004, 09:07 PM


Quote: Originally Posted by Monkey you'll have to reprogram PATS on the F150 engine. just use the stock ECU. you'll be fine.

If he wants to keep the knock sensors he'll need the computer, but if he doesn't want to keep them, he can just tune his car so that his EEC knows he has a 4.2 now and the extra airflow of course.

chips · 09-07-2004, 12:08 AM

the 4.2 has a m50d tranny

Bane- · 09-09-2004, 03:18 PM

any est. on how much a 4.2 would cost? im gonna start lookin around soon to get rid of the 3l in my truck for the 4.2 id prally have to buy just as much huh? id luv to get it with a 5spd but who knows how much work that could be, 3l auto to 4.2 5spd D:

97Stallion · 09-09-2004, 04:59 PM

Well from a junkyard, you could probably get the whole engine for aout $500-$1000. Maybe less, it all depands on the junkyard. But I personally wouldn't pay more than $600 for the whole thing.

timpryor · 09-09-2004, 05:31 PM

bane if your 3.0 a duratec?

Bane- · 04:14 PM

kinda bringing this back from the dead but owell :p

i think its the vulcan 3.0 im not sure nor can i remember how to find it out again. lol

*edit* found it, another ranger site says that the vulcan 3.0 has been around since 86 so everything 86 and up has it that has a 3.0 in it.

plstktnkr2 · **4.2 parts**

for a dual port 4.2 use the heads, crank, and rotating assembly. mustang block is fine so tranny will fit but intake is different ,so "can" it

97Stallion · 10-06-2004, 10:14 AM


Quote: Originally Posted by plstktnkr2 for a dual port 4.2 use the heads, crank, and rotating assembly. mustang block is fine so tranny will fit but intake is different ,so "can" it

You can use everything except the upper intake from the 4.2. If you get a 99+ upper, you're golden!!