Your Guide to Fat Fender Chassis
At a Glance
Every classic truck we build starts with a chassis. Get this part wrong, and you could be looking at a five‑figure mistake. We've seen it happen. We've helped fix it. And we don't want it to happen to you.
This list breaks down the five things most chassis companies won't tell you—straight from our shop floor.
#1: Pick Your Wheels Before Your Axle
The mistake: Ordering a chassis, then picking wheels later.
The reality: Your wheel choice decides how wide your rear axle needs to be.
We learned this one the hard way…
The question that saves everything: What wheels do you want in the back?
- How much tire do you need?
- Do you need a mini tub?
- What about the front?
Pro tip: On a slammed truck sitting 5½ inches off the ground, every fraction of an inch counts.
#2: Read Your Chassis Quote Like a Detective
The mistake: Comparing quotes by price alone.
The reality: A cheap quote might be missing parts you'll need to buy anyway.
Parts that should be standard (but often aren't):
- Front sway bar
- Rack and pinion
- Disc brakes
- Ball joints & spindles
- Control arms
- Motor mounts
- Transmission mounts
Bottom line: Don't just ask “how much?” Ask “what’s included?”
#3: Know How Your Chassis Is Built
The mistake: Assuming all chassis are built the same way.
The 3 main ways to build a chassis:
- Mandrel‑bent tube
- Laser‑cut and welded
- Formed flat sheet (what we use)
Formed steel = 39% more material, up to 3× stronger, zero flex.
Extra weight = traction. No flex = handling. Consistency = perfect fitment.
#4: Make Sure Everything Actually Fits
The mistake: Assuming your engine, headers, and accessories will work with your chassis.
Real stories from our shop:
- Engine didn’t fit — oil pan & hood clearance wrong.
- No headers would clear the steering shaft.
How we solve this: We build trucks, not just frames.
Our headers curve around the steering shaft. Our brake booster brackets account for ride height. Our fitment is tested on real builds.
#5: Plan for the Future
The mistake: Building a chassis that can't adapt.
Welded mounts = permanent. Bolt‑on mounts = freedom.
Engines change. Technology changes. Your build should be able to change with it.
Our philosophy: All motor mounts and body mounts bolt on.
The Bottom Line
Buying a classic truck chassis isn't just about price. It's about asking the right questions before you order.
- Decide on wheels before choosing axle width
- Read every line of your quote
- Understand how the chassis is built
- Confirm engine & header fitment
- Choose bolt‑on components
FAQ
How do I know if my chassis quote includes everything?
Look for sway bars, steering rack, brakes, ball joints, control arms, and mounts.
Why pick wheels first?
Your wheel width determines axle width. Doing it backwards costs thousands.
What makes a chassis strong enough for a Coyote or Godzilla?
Formed steel doesn’t flex. It puts power down safely.
Why do bolt‑on mounts matter?
They let you adapt to new engines without cutting.
How do I ensure everything fits?
Work with a shop that builds complete trucks, not just frames.
Ready to Build Your Truck the Right Way?
Your chassis is the foundation of your entire build. Choose the right one, and everything gets easier.
Fat Fender Garage exists to redefine the classic vehicle experience. We design and build industry‑leading chassis, interiors, parts, and full builds that merge heritage with innovation.
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