Top Notch Differentials

Top Notch Differentials Whether it’s an OEM rebuild, Off-road, or drag racing, we’ve got you covered.

Let’s hear it from the people actually running them 👀What benefits did YOU notice after changing your gear ratio?Better ...
08/31/2026

Let’s hear it from the people actually running them 👀

What benefits did YOU notice after changing your gear ratio?
Better acceleration? Towing? Bigger tires? Highway driving? Overall performance?

👇 Drop your gear ratio + your real-life experience in the comments.
Let’s see what everyone’s running! 🔧⚙️

☀️ SUMMER SALE IS LIVE! ☀️We’re running a special on GM 10-Bolt Differentials — complete builds for $1,599 + tax 🔥That p...
08/29/2026

☀️ SUMMER SALE IS LIVE! ☀️

We’re running a special on GM 10-Bolt Differentials — complete builds for $1,599 + tax 🔥

That price includes POSI, gears, bearings, seals, fluid AND labor. Whether you’re looking to upgrade your gearing, add a posi, or finally get that differential handled, this is the time to do it.

📅 Sale ends September 30, 2026
📩 DM or call us to book your spot.
⚙️ Limited availability — once the schedule fills up, that’s it.

If not us, WHO? 🔥

☀️ SUMMER SALE IS LIVE! ☀️

We’re running a special on GM 10-Bolt Differentials — complete builds for $1,599 + tax 🔥

That price includes POSI, gears, bearings, seals, fluid AND labor. Whether you’re looking to upgrade your gearing, add a posi, or finally get that differential handled, this is the time to do it.

📅 Sale ends September 30, 2026
📩 DM or call us to book your spot.
⚙️ Limited availability — once the schedule fills up, that’s it.

If not us, WHO? 🔥

🔥 CLASSIC C10 OWNERS — WE GOT YOU TOO! 🔥

We’ve also got Summer Sale deals available for GM 12-bolt differentials for your classic C10. ⚙️💪

DM us for pricing and details!

BIG WHEELS? YOUR STOCK GEARS ARE FEELING IT. 👀

Those oversized wheels and tires look good, but they also add weight and change the effective gearing of your truck. The result? Sluggish acceleration, more strain on the drivetrain, and a truck that just doesn’t feel as responsive as it should.

⚙️ Proper gearing helps bring that power back. Better takeoff, improved throttle response, and gearing matched to your setup.

And right now, our GM 10-Bolt Summer Sale is $1,599 + tax — including POSI, gears, bearings, seals, fluid & labor.

🔥 Big wheels deserve the right gears.
📩 DM us to get your setup dialed in.

No shortcuts. No cutting corners. Just quality differential work done right the first time. ⚙️🔥 Top Notch Differentials — If not us, WHO?

No shortcuts. No cutting corners. Just quality differential work done right the first time. ⚙️🔥 Top Notch Differentials — If not us, WHO?

We don’t just build them—we test them, abuse them, and prove them. 💪⚙️ We know our builds can take the power and keep going. Built to last. Built Top Notch.

We don’t just build them—we

Our neighbors over at AM Dyno came in for a differential swap after the housing developed cracks from overly tightened U...
08/28/2026

Our neighbors over at AM Dyno came in for a differential swap after the housing developed cracks from overly tightened U-bolts.

Since everything was coming apart anyway, we took advantage and upgraded them from 4.88s to 5.13 gears, along with heavy-duty U-bolts. ⚙️

And this isn’t your average truck big single turbo, 800+ HP, and a differential built to take every bit of it. 💪🔥

They loved the way the 5.13s woke it up so much, they made the jump to 37s.

800+ HP? No problem. Send it. 🚀

08/25/2026

Customer states: “I was just driving normal and then I started hearing a noise.” 🤔

Meanwhile, the customer: 💀💀💀

FULL SEND because that’s all we know over here 🚀

08/24/2026

You ever look at something and just say, “Absolutely the f**k not”?💩💩😂

There’s always a debate about this one… 👀WHAT’S THE BEST GEAR RATIO? ⚙️3.73?4.10?4.56?Or something else?👇 Drop your rati...
08/24/2026

There’s always a debate about this one… 👀

WHAT’S THE BEST GEAR RATIO? ⚙️

3.73?
4.10?
4.56?
Or something else?

👇 Drop your ratio in the comments AND tell us why.

Let’s see which gear ratio takes the crown. 🏆

4x4 ChevyTrucks BuiltNotBought

07/15/2026

The perfect chop doesn’t happen by accident.

A quality cam, the right parts, and a clean installation make all the difference. This BTR Truck Norris Cam delivers the nasty idle everyone wants without sacrificing drivability.

Ready to transform your truck? Let’s build it.
📩 DM us for a quote.

Some builds are about horsepower. Others are about doing everything the right way. This Denali was both 🚀Every part of t...
07/13/2026

Some builds are about horsepower. Others are about doing everything the right way. This Denali was both 🚀

Every part of this build was planned with performance, reliability, and attention to detail in mind. From the engine and drivetrain to the cooling system, wiring, and brakes, no shortcuts were taken.

Build Highlights:
• Complete engine overhaul
• BTR Truck Norris camshaft 🍿
• High-compression 799 heads & TBSS intake 🔥
• Speed Engineering long-tube headers 💨
• Flex fuel conversion 🌽
• Custom intake with LS3 MAF 🧪
• Engine bay wire cleanup⚡️
• Aluminum radiator & electric fan conversion 🥶
• 40K transmission cooler with custom -6 AN braided lines 🪭
• 4.10 gears front & rear with an Eaton Detroit Truetrac ⚙️
• 6-piston Brembo front brake upgrade with custom pink powder-coated calipers 🛑
• Big 3 wiring upgrade for future audio
• Complete accessory and maintenance refresh, including water pump, power steering pump, hoses, tensioner, idler pulley, and more 😎

The details are what separate an average build from a great one. Clean wiring, proper routing, quality components, and taking the time to do things right that’s what this project was all about.

Huge thanks to Brandon for trusting us with this build. We appreciate the opportunity and can’t wait to see this Denali back on the road where it belongs.

Top Notch Differentials 🚀
If not us, WHO?

😎

Trust isn’t earned with words it’s earned with every detail.Before any differential leaves our shop, it goes through one...
07/09/2026

Trust isn’t earned with words it’s earned with every detail.

Before any differential leaves our shop, it goes through one final set of eyes. Rigo is our last line of defense, making sure every setup, every measurement, and every component meets our standards.

Quality isn’t an accident. It’s our process.

Top Notch Differentials
If not us, WHO? 🚀

Address

5907 Firestone Boulevard
Downey, CA
90280

Opening Hours

Monday 10am - 6pm
Tuesday 10am - 6pm
Wednesday 10am - 5pm
Thursday 10am - 5pm
Friday 10am - 6pm
Saturday 10am - 2pm

Telephone

+3234805030

Website

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