I've read thru what everyone has said about your issues with your truck. These individuals who know these older 4.0 engines have more experience than I do. Im more of a 3.0 owner.
I can provide some advice on the starter. I owned a 1994 ford ranger 3.0 5spd for 31 years until it was totaled last summer..not my fault. Thru the years I've always used motorcraft starters..better quality. As the decades went on, ford starters became to expensive. I checked with junkyards and found a two ford oem starters from 93-97 3.0 rangers with a manual transmission.
Fast forward to 2023, i needed a starter and went looking at oem new, rebuilt or used. Found nothing local, got on ebay and found a nos 3.0 starter rated for a 93-97 3.0 aerostar.. well all aerostar vans in the 90s were automatic. Internet research, talking with ford local and in Detroit. Ford in Detroit did say a starter from a 3.0 automatic will work on a 3.0 5spd. That was my question..I bought the starter to install it, and was still going good until my 94 was totaled. I have a 97 3.0 5spd ranger now, and I have spare starter from a 3.0 automatic I picked up last year from the junkyard.
Long explanation, what i did discover is a 4.0 automatic transmission starter will not work on a 4.0 5spd transmission. The same with a 2.3. The 3.0 starter is the only one that will work on both. My suggestion is instead of buying a new or rebuilt junk from the auto part store. Go where the real junk is and find a good used oem starter from a vehicle at the yard. Then have it tested at the store to make sure it's good.
For your needs, I say any ranger from 91-99 4.0 5spd will work, it all the ohv engine. Any 91-99 explorers 4.0 5spd will work..just make sure 95+ explorers has the ohv engine not the sohc engine. Most 4.0 5spds were in the explorer sports of those years. Get a starter from a 5spd trans only, not an automatic.
Hope this helps
this is a thing. but this thinking is also a problem. a large majority of my family is or was in r&d and prototyping and development in the big three. if you look at all of the engine failures the last ten years in the big3 which is now toyota ford and gm with sometimes dodge...your faith in oem superior parts should be lowered from the 90's
myself and my younger brother that is still alive are the oddballs in that we work in different fields outside of r&d big three....
but because of these relationships and my actual access into certain facilities...i have a real real clear look at what actually moves in the pipeline...and how those processes are decided.
thinking that engineers know wtf they are doing or quality is highest at the dealer level...you are misinformed or just choose to believe in something that dont work that way anymore....sure...some of the engineers are awesome. but cost out determines part actuals.
the rapid prototyping technology now is a sword with many edges..
what those engineers want...and what we get...is not what really happens at the end of the assembly line....and getting parts down the road....good luck.
as to what i mentioned earlier..
in one case, the known workable parts i did use in my specific application on the b2...they were not necessarily actual motocraft parts...though that one starter may in fact have been a oem motorcraft starter...regardless...they were known working ok when i swapped the engine.
the fresh engine got fresh stuff...which should have been ideal. and it didnt work. difference being just the engine. exercise in frustration to be sure.
thing about the colognes is they will sometimes have crank shims...and if you have them they may need to stay on...just like the sac clutch verse std pressure plates...mixing and matching can cause a failure of proper operation...
so if you buy an already pulled engine and it had 3 shims that are now long gone....well...good luck figuring that out.
problem being this will cause more engagement not less in regards to the starter. which would cause it to drag a bit. i have only had that issue a few times, but those shims were on it when it left ford in a few cases.
but that is a different problem.
the problem i am referring to and i assume taco girl has...is lack of engagement....that is damaging the flywheel teeth.
in her case...both depth and radial
in my plow trucks case, engagement. peeling the edge.
all of these issues can simply be the result of a stretched or distorted separator plate....and i suspect this is probably the main issue.
getting separator plates for this application that are true and new has proven a no can do for me...though occasionally getting nos units happens..
going forward.
determining if its just a crap nose cone from the re-man....as not all re-mans are the same....and some re-mans are actual oem equipment suppliers at that...figuring out how to work with what is readily available is my goal.
getting a genuine new starter that is motocraft for a 4.0 is one thing. whether or not it will work with an aftermarket flywheel is another.
i know all of the stuff i got from oem ford parts outlet for pumps starters and alternators were all remans in regards to pushrod engines...
finding 4.0 manual starters at the junkyards i shop at is a low probability event....finding one with an oem starter is hitting the lotto for 4 numbers odds...
so it will take some more work to see what is doable with known parts and issues