1979 Bronco Coyote Swap

19922 Views 74 Replies 10 Participants Last post by 79CoyoteBronco, Jul 21, 2020

79CoyoteBronco

Discussion Starter · Mar 25, 2020

Hello, I have owned a 1979 Bronco since I was in high school. I tore it apart my first year in college in 1997 but didn't have the resources to do what I wanted to it, marriage, kids, life, divorce etc. all got in the way. Now I am 42 and have the funds to do what I want.

I have purchased a 2016 F150 Coyote motor that only had 32k miles from a wrecked truck. I just picked up a ZF-5 S5-47M transmission to put behind it. All bolts up as it should, the motor has the original Flexplate from the automatic and I need to know what clutch to get for this. The transmission is from a 99 F250 SuperDuty but the seller did not know what motor it was behind. likely a 5.4L V8 or a 6.8L V10. They all share the bell housing pattern with the newer 5.0L Coyote. The 5.4L flywheel and Mustang 5.0L flywheels on RockAuto seem to be different sizes, so not sure which I will need to work between the two setups. I am thinking for the starter to line up, I need the 5.0L flywheel, and maybe the 5.4L or 6.8L clutch???

Flexplate through the Slave cylinder hole.

bolted together to verify fit and alignment. Need correct bellhousing bolts. These were the 114mm ones that allowed the motor on my engine stand...

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CrazyBRONCOguy

· #2 · Mar 25, 2020

Have stock clutch and flywheel from '17 mustang if you need any measurements, or want it you can have it. If your close to Indiana. It has heat marks on it from slipping under hard use at drag strip, but if helps.

Hillbilly Heaven

· #3 · Mar 25, 2020

I would think you need the Coyoie flywheel and truck pressure plate and clutch disc. This is so you get the right height for the release bearing and the proper spline for the input shaft. You may have to get flywheel drilled for the pressure plate bolt pattern.

Not familiar so much with coyote and mod motors but do they still use a motor plate between motor and transmission? If they do then that will determine starter location and which flywheel.

Since they share the same bellhousing pattern you may be able to use mod motor plate and flywheel this way the starter and clutch bolt right in.

I need more coffee to think clearer.

79CoyoteBronco

Discussion Starter · #4 · Mar 25, 2020

Hillbilly Heaven said:
I would think you need the Coyoie flywheel and truck pressure plate and clutch disc. This is so you get the right height for the release bearing and the proper spline for the input shaft. You may have to get flywheel drilled for the pressure plate bolt pattern.

Not familiar so much with coyote and mod motors but do they still use a motor plate between motor and transmission? If they do then that will determine starter location and which flywheel.

Since they share the same bellhousing pattern you may be able to use mod motor plate and flywheel this way the starter and clutch bolt right in.

I need more coffee to think clearer.

The motor came with a thin (3/32") metal plate that was between the engine and automatic Transmission... I think if the Mustang flywheel and pressure plate could be used with a same diameter clutch disk but with the ZF-5 splined center to match the transmission. I will figure this out at some point. Thanks for the replies. Somebody has done this before... just have to find the right search terms...

CrazyBRONCOguy

· #5 · Mar 25, 2020

I know mantic and mcleod will spline a clutch to what ever you want, to match the input shaft.
Common on a mustang to move from the stock splines to something bigger with more spline count, or if moving from stock mt82 to a tremec etc....

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79CoyoteBronco

Discussion Starter · #6 · Mar 25, 2020 (Edited)

I went to the parts store today, looks like the Mustang has a smaller 11" clutch the 5.4L and 6.8L had larger 12" clutches. Looking at the starter for a 99 Superduty, it showed that starter also fit F150, Mustangs and every combination of year and engine for the Modular ford pattern. So that tells me that the ring gear is the same diameter to reach the starter, the clutch is just smaller on the mustang, likely due to smaller bell housing trying to cram a manual gearbox in a tiny car. I am going to pull the flex plate and measure it to verify my theory. I purchased new starter and will see how it lines up with the flex plate before I purchase the 5.4L clutch... Pretty sure the 8 bolt pattern for the crank mount is also the same on the 5.0L engine as the 4.6L/5.4L and 6.8L modular engines.

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Hillbilly Heaven

· #7 · Mar 25, 2020

Just make sure the balance is the same between 5.0 and 5.4

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79CoyoteBronco

Discussion Starter · #8 · Mar 25, 2020

from what I read, all the Modular engines are internally balanced. I will verify that information before I buy.. Thanks,

Hillbilly Heaven

· #9 · Mar 25, 2020

One thing you may want to check is if they used a different motor plate from automatic to manual.

79CoyoteBronco

Discussion Starter · #10 · Mar 26, 2020

Hillbilly Heaven said:
One thing you may want to check is if they used a different motor plate from automatic to manual.

I am not sure what you mean by "motor plate"? If you are refering to flexplate that an auto uses vs. a flywheel that manual uses, then yes, they are always different. Flywheels are thick and have the friction surface that the clutch is clamped to. The flexplate just serves as a ring gear for starter and a way for the crank to connect to the torque converter of the automatic...

This F150 motor from 2016, was never offered with manual transmission. Its higher horsepower sister in the Mustang was, but they use smaller tight gear ratio rear wheel drive transmissions designed for quick power etc.

The older siblings from the same vintage as this transmission in 1999-2001 were offered with manuals.. this came out of a f250-450 superduty truck with 5.4LV8 or 6.8LV10

They all share the same bell housing, which is why what I am doing will work, but having to figure out a few details on clutch, slave/master cylinders etc.

Thanks,

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Doosenberry

· #11 · Mar 26, 2020

79CoyoteBronco said:
The motor came with a thin (3/32") metal plate that was between the engine and automatic Transmission...

Hillbilly Heaven said:
One thing you may want to check is if they used a different motor plate from automatic to manual.

79CoyoteBronco said:
I am not sure what you mean by "motor plate"?

Doosenberry

· #12 · Mar 26, 2020

Something similar to this. This was on google as a Coyote block plate. I'm sure there are a couple variants. Auto vs Manual.

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Hillbilly Heaven

· #13 · Mar 26, 2020

Thank you @Doosenberry. That I'd what I was referring to. It is critical as it locates the starter. Typically Ford used different ones depending if it was automatic or manual.

79CoyoteBronco

Discussion Starter · #14 · Mar 26, 2020 (Edited)

Yes it has one that was the automatic, it lines up fine with the manual transmission, but seem to be missing the small plate that goes on the bottom to cover the ring gear. So it is flat accross the bottom and the transmission is round. I will likely just make that filler/cover plate as there are 2 smaller bolts that go into transmission to hold it on.

Thanks,

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Hillbilly Heaven

· #15 · Mar 26, 2020

It will line up perfectly with the transmission of any type BUT the mounting holes for the starter may be in different locations depending upon the transmission type.

CrazyBRONCOguy

· #16 · Mar 26, 2020

Likely way down the list but make sure your tuner you get (if you dont have one) can do a crank position re-learn.

Cool thread please make sure to update it (or a build thread) with pics and stuff as you go. Super interested to do this to a 76-79 Ford myself.

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79CoyoteBronco

Discussion Starter · #17 · Mar 26, 2020

I am not sure why I would need a tuner, I am using ford performance wireing harness/PCM and the power by the hour F150 harness that is modified to work with Mustang Ford Performance kit.. firing order is different..

Power by the Hour

Hillbilly Heaven

· #18 · Mar 26, 2020

If the firing order is different then the camshafts have to be changed to match the new firing order.

79CoyoteBronco

Discussion Starter · #19 · Mar 27, 2020 (Edited)

Hillbilly Heaven said:
If the firing order is different then the camshafts have to be changed to match the new firing order.

No what I mean, the F150 and Mustang motors have a different firing order. So the harness that they sell is desiged to make the harness from ford performance work on an F150 motor. From the power by the hour website:

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CrazyBRONCOguy

· #20 · Mar 27, 2020

Experience on these combos says that you will need to at least do the crank shaft re-learn. This could be done at a Ford dealer too. That is totally to do with changing the clutch not so much due to your combo.
In the Mustang the stock (or in my case Roush) tune is super finicky about the intertia of the drivetrain, due to protections it has built in... I swapped clutch and flywheel and had to get a new tune to make it all work correctly due to these changes. They are also super picky on the air box and exhuast as well. For example removing the air filter will throw a CEL on a 5.0 mustang.
It is possible your pcm will be a bit different being from the Ford Performance kit. Hopefully it is.

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