I have an 89 f-150 with a new motor and tranny, but everything else seems to be rotting away. I wanted to put the motor into a 1993 bronco. It currently has a 302 in it. If I swap motor complete what else would need to be done to the bronco?

 

Keep this in mind depending on which tranny you use the 302 uses a 50 oz flexplate/flywheel and the 351 28 oz so you will need appropriate flexplate/flywheel for the appropriate engine but either tranny with work. You will need to use a 351 y pipe or modify yours you will need to keep the 351 fuel rail or modify your 302 you can use the 302 upper on the 351 lower if it doesn't have one. You will need to either change the chip or firing order of the fuel injectors a fellow on here used a 302 computer and switched the 3-7 and 5-4 injector harnesses to create a 351 firing order using a 302 computer and it work fine. Probably missed something but that is the bulk of it, later and good luck

 

Thanks man. I have all of the parts from the 351 including y-pipe. Can I swap the computer, the one on the 351 is brand new? What it sounds like is if I move all FI stuff and everything swap y-pipe and flexplate all "SHOULD" be smooth.

 

You are correct and yeah go ahead and use the 351 computer. Good luck

 

Thanks. Seeing as how my motor is complete, do I even need to swap flexplate? WILL I need to keep any sensors off 302? The 89 f-150 is a driver with a new motor and a highly rotten frame, so I can gut it at will. Any other parts I need to scrounge?

 

Well if the 351 is complete as in already has a flexplate attached then no you don't need a new one. You do not need anything off the 302 that I can think of your harness should plug into the firewall and the computer should drop in as well good luck and let me know how it goes, later

 

are the transmissions the same e40d uses a different flexplate than an aod

 

No they are not the same.

 

You might wanna compare the flexplates then just to see there have been others who have done swaps and use different flexplates on different trannies. Just make sure they are dimensionally the same in every way down to the teeth count. Or just get a new one they arent that expensive. later

 

the flexplates look the same they will bolt up but the offset is different the e4od flexplate used with the aod will push in on the torque converter and ruin the trans.

 

also the 5.0 upper will not fit the 5.8 lower. you also dont need to change the injector firing order or the computer the 5.0 computer and injector harness will work fine on the 5.8 just use the 5.8 firing order what transmissions do the trucks have?

 

jesse460
not questioning you or anything but a fellow just did the swap and he had to switch the injector harness because his truck appeared rich all the time with a 351 to 302 computer swap, like I mentioned it will run but appear to be rich from the fuel mixture sitting around waiting to be burnt. And while I am not positive I have always been told a 302 upper will bolt to a 351 lower. What does "the injector harness will work fine on the 5.8 just use the 5.8 firing order mean". Well we do agree on the transmissions though that is why I told him to check it to make sure it was the same dimensionally in every way as they will all bolt to a 302/351 but they do have different teeth count and as mentioned offset. later

 

The 302 and 351 manifolds have completely different runner shapes, so you won't be able to interchange the uppers. Pretty much anytime you can find a manifold for the 351, I'm sure upper and lower would be attached, so just get the whole thing when you do the swap. I don't know why a 351 would run rich with the 302 wiring harness, but that's a good thing to keep in mind. The only thing I can think of is that different cylinders are grouped into each batch of injectors due to the difference in firing orders. jwtaylor, did the guy you know use the 351 computer? I think that's what you're saying but I wanted to be sure. I've heard of people swapping computers and some people not, so I was just curious what worked for his truck.

 

The injector harness is no different on the 351. The pre mass air trucks are batch fire and there is no difference in the injector order between the 302/351. Just change the firing order. When I did my swap, I used the 302 computer for a while and it ran fine. I am still using the 302 wiring harness/ injector harness/ various sensors from both engines/ and the 302 vac lines.

a 302 intake is NOT compatible to a 351. They have different ports.

 

I got ya on the intakes I was seriously always told and under the impression they were the same uppers, and as I mentioned in the post I wasn't positive. However I know the wiring harnesses are the same but if you use a 302 computer and a 351 wiring harness then the injectors are firing incorrectly.

As I stated before twice it will run if you put a 302 computer on a 351 and I know the wiring harness is the same. Here is the exact post as reference made by lexluthr69 should you run a 351 with the 302 computer:
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You still have 4 misfiring injectors. The batch fire SD system fires the injectors as batches, but it does it in tune to the 15426378 plug firing order. It is not that detrimental of an effect, but is still something to consider. Now the fuel/air mix is having to sit a bit longer, waiting for the intake valve to open.
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How does that not make sense? fordtrks4fr just finished this swap and he noticed a rich smell he switched the injectors harness or actually two wires so they fired in the 351 firing order and not the 302 and he seemed to think it ran better and the smell went away. Just a thought, let me know your thoughts

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