Explorer 5.0 engine swap

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    Explorer 5.0 engine swap

    Going to be helping brother in law build a wheeling rig. Using a Bronco II as a base vehicle. He decided he wanted to go with a 302 and an automatic. Currently we are on the hunt for a cheap 96 Explorer for a donor. Plan is to use the engine, computer and minimum amount of the wiring to make engine run. I already have a c5/c4 rebuilt for it. Here is the question- will the engine still function properly without the computer being able to communicate with the explorer 4R70w. Probably just show a fault if I plug in a code reader to OBD2 plug, but engine should function still, I am thinking. Am I right or wrong??

    #2
    It should work. Youll need to make sure you have the correct flexplate for the C4 since theres 2 styles.

    Why not just run the 4R? Or run a 700R4?

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      #3
      Will be a wheeling only rig, so no need for an overdrive gear. Using an early 80's C5 from a BroncoII with bellhousing, torque converter and valve body from a C4 out of a 75 six cylinder Maverick. Smaller (57 tooth??) Flywheel and bellhousing. Already have the aftermarket 50oz flexplate to make it all work together. I am concerned about the 302 potentially breaking ranger based t cases and the hybrid 35/44 front axle setup I already have in rig. Running 33 inch cut boggers/claws. 8.8 rear shouldnt be a concern. Anybody else run 302 power through the stock ranger based t case??

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        #4
        Originally posted by Defecater View Post
        I am concerned about the 302 potentially breaking ranger based t cases and the hybrid 35/44 front axle setup I already have in rig. Running 33 inch cut boggers/claws. 8.8 rear shouldnt be a concern. Anybody else run 302 power through the stock ranger based t case??
        Seems like this is more reason to keep the 4r70w and get 31 spline tcase.

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          #5
          Originally posted by MtnYota View Post

          Seems like this is more reason to keep the 4r70w and get 31 spline tcase.
          This

          1356 bolts right up to the 4r70w. And the 1356 will take any abuse a stock 302 can throw at it
          PM Trampas for all of your moderation needs

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            #6
            I figured the really short wheelbase and narrow frame would be a serious obstacle to running the 4r70w and a full size case(other than a 205, and those suck ass for low range) I figured if the transfer case breakage becomes too rampant, an early Bronco C4/ dana 20 combo would make a sizable improvement. It is a beginners rig for him but he days eventually he wants to use tonner axles and ag tires in future. Will pretty much HAVE to do a transfer case improvement then.

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              #7
              The 4R70W would be a way better transmission than the C5 gearing wise (lower 1st gear and a high overdrive that will compensate for deep axle gears). I can understand running the C5 though if it won't be driven on the highway and you want to keep the BW1350/1354. The RBV Borg Warner cases are pretty stout for their size and will have no issue holding up to what you describe. The BW 1354 is a bit stronger than the BW 1350 and you don't have to worry about slip yoke versions. Either will hold up to more than your axles will.

              As someone with a BW 1356 in a Bronco II, they don't really fit well and require some hacking to get everything to work. For what you are talking about, I'd run a BW 1354.

              As for your original question, yes you can use the Explorer motor's EDIS and OBD II computer and harness without the 4R70W pretty easily; the computer will just need to be flashed for it. If you are considering running the 4R70W, the Explorer harness and computer is a pretty slick way to do it. The Explorer 5.0L swap is super popular on ClassicBroncos.com right now. There is a guy who goes by EFI Guy who specializes in the Explorer harness work and PCM flashing if you don't want to do it yourself, but he has posted a bunch of DIY information on Classic Broncos and Youtube if you want to tackle it yourself. I'd give you links, but I am posting from my phone and it is a pain in the ass to do. It should be pretty easy to find, but let me know if you are having trouble finding the information.

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                #8
                Good to know. I will root around over at classicbroncos and see what I can find.

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                  #9
                  Originally posted by Defecater View Post
                  Good to know. I will root around over at classicbroncos and see what I can find.
                  I am on a computer now, so I'll link the Tech:

                  The videos are pretty dry, but super detailed:






                  Here's the original thread on Classic Broncos, but there are other threads as well with lots of good information: https://classicbroncos.com/forums/sh...d.php?t=224697

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