What challenges should I expect when swapping a 460 engine and F250 axles into my 1987 F150?


Bullnose Bill explains modifications for a 1987 F150 with F250 parts.

This Q&A session is powered by Bullnose Bill, Bullnose Garage’s advanced AI mechanic.
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Bill says:

Hey there! That sounds like an exciting project you’ve got going on! Dropping a big-block 460 with a 5-speed transmission into your ’87 F-150 is sure to give you some serious power and performance.

Now, while it’s an awesome upgrade, there are a few things you should keep in mind:

  1. Engine Mounts: The 460 is a lot bigger than your stock engine, so you might need to get custom engine mounts or modify your existing ones to fit the new engine. Check the Bullnose Garage YouTube channel for some tips on fabbing mounts if you’re going that route.

  2. Transmission Fitment: The 5-speed transmission will likely require some modification to the crossmember and possibly the driveshaft. Make sure to measure the length and check the alignment to avoid any surprises.

  3. Axle Compatibility: Since you’re using the axles from an ’89 F-250, ensure that the axle widths accommodate your F-150 frame well. Be mindful of the gear ratios too, as you’ll want to match the 460’s power band for optimal performance.

  4. Wiring: The 460 will also have a different wiring setup, especially if you’re using a later model transmission. You might need to do some re-wiring or adapt the harness to fit everything nicely.

  5. Cooling: With all that extra power, consider your cooling system too. The stock radiator might struggle to keep a big-block engine cool, so you might want to look into an upgrade.

  6. Braking System: The added weight and power will necessitate a good braking system. Upgrading to a more robust brake setup can help ensure safety.

Before you dive in, it might be worth checking out some discussions on the Bullnose Ford subreddit for insights from folks who’ve done similar swaps. It’s a great community, and you might find some valuable tips!

Best of luck with your build! If you run into any specific issues or questions, feel free to ask. I’m here to help!


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User:

I appreciate your insights. I’m concerned about the issues you raised. The F250 was rolled, but its frame remains straight. Should I consider placing the F150 body onto the F250 chassis instead?

Bill avatar
Bill:

You’re very welcome! It’s totally understandable to have concerns about that swap; these projects can get tricky, but they’re also super rewarding!

Keeping the lighter F-150 frame while using the F-250 components is a good approach, especially if you want to maintain a bit of that nimbleness, but dropping the F-150 body onto the F-250 chassis can be a fantastic option too! That way, you’ll benefit from the stronger F-250 frame, which should handle the added weight and power of the 460 much better.

Here are some things to consider if you decide to go that route:

  1. Fitment: Make sure the body mounts line up properly between the two frames. You may need to do some custom mounting or adjustments to get everything to fit just right.

  2. Height Differences: Keep an eye on the height of the F-250 frame compared to the F-150. You might end up with a higher ride height, which could affect your center of gravity. Adjusting the suspension could help to level things out.

  3. Drivetrain Alignment: Ensure that the drivetrain (engine, transmission, driveshaft) lines up correctly once you drop the body onto the F-250 frame.

  4. Wiring and Dash Components: There might be some differences in the wiring harnesses, especially if you’re using components from different model years. Just make sure to document everything for a smoother install.

  5. Weight Distribution: The F-250 frame is built to handle more weight, so it should be more stable with the bigger engine. That could enhance your overall ride quality and performance, especially under load.

  6. Future Modifications: If you plan to do any further modifications, like adding towing capacity or off-road enhancements, starting with the F-250 frame can provide a solid foundation.

You’re on the right track thinking about these options! Whatever you decide, it’s bound to be an impressive build. If you have any further questions or need advice on specifics, feel free to reach out. Happy wrenching!

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User:

My main focus is off-road capability. What should I consider for the suspension upgrade next?

Bill avatar
Bill:

That sounds like a blast! Setting up your Bullnose for off-road adventures is such a great way to enjoy your truck. With a solid platform like the F-250 chassis and the 460 engine, you’re already on your way to an off-road beast!

When it comes to suspension, here are some key points to keep in mind:

  1. Lift Kit: If you’re planning to tackle some serious off-roading, consider investing in a good lift kit. A 4 to 6-inch lift will give you more ground clearance, which is essential for navigating rocks and rough terrain. Plus, it’ll allow you to fit larger tires.

  2. Quality Shocks: Look for high-performance shocks designed for off-road use. They’ll help absorb the impact from bumps and rugged trails. Brands like Fox or Bilstein are popular choices among off-road enthusiasts.

  3. Leaf Springs: If you’re keeping the stock leaf springs, you might want to upgrade them to heavy-duty or off-road-rated springs. This will improve load capacity and ride quality when hitting the trails.

  4. Sway Bars: If your truck has sway bars, consider adjustable or disconnectable ones. This can help with articulation when you’re off-roading, allowing the wheels to move up and down more freely over obstacles.

  5. Tires: Don’t forget about the tires! A good set of all-terrain or mud-terrain tires will improve traction significantly. Make sure they fit within your wheel wells after lifting the truck.

  6. Alignment: After making any suspension changes, get a proper alignment. This will help ensure that your tires wear evenly and that the truck handles well on and off the road.

  7. Skid Plates: Consider adding skid plates to protect your undercarriage, especially with the bigger engine and any off-roading you’ll be doing. This will help you avoid damage from rocks and uneven surfaces.

If you’re looking for inspiration, check out some off-road builds on the Bullnose Garage YouTube channel. They often share invaluable tips and ideas that can help you with your project.

Once you get that suspension dialed in, you’ll be ready to hit the trails with confidence! If you have more questions or need specific advice as you move forward, just let me know. I’m here to help!



Disclaimer: The preceding text was generated by Bullnose Bill, an AI. It is possible that the information provided is not accurate. Always double-check advice and consult multiple sources before undertaking any maintenance or repair tasks. For real hands-on information, you can always visit Bullnose Garage on YouTube or check in with the BullnoseFord SubReddit.


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