2024 Silverado 2500HD LTZ Front End Swap on an LT: Parts List, Harness, and Grille Details
2024 Silverado 2500HD LTZ Front End on an LT: What You Need and What to Watch For
If your 2024 Silverado 2500HD came as an LT and you want the LTZ front end, the conversion is doable — but the 2024 redesign introduced a few specifics that caught early builders off guard. Here’s the full picture.
What’s Actually Different Between the LT and LTZ Front End
The 2024 model year brought a significant redesign to the Silverado HD’s face. LTZ, ZR2, and High Country trucks received new dual-projector LED headlights with a built-in animated lighting sequence — the lights run through a welcome or farewell pattern when you approach or walk away from the truck. The LT gets a more conventional setup: halogen projectors, a simpler fascia, no animation.
The grille also differs by trim. The LTZ runs a chrome bar unit that reads noticeably sharper than the LT version. That visual gap is exactly what drives people to do this swap.
OEM Parts for the Swap
These are the GM part numbers confirmed through dealer lookups and early 2024 converters. Online parts catalogs were still catching up as of late 2023, so cross-check with your dealer before committing to an order:
- Grille: 85620357
- Front fascia: 85615608 (ships primed, ready for paint)
- Passenger headlamp: 86514718
- Driver headlamp: 86514717
The grille (85620357) comes with the chrome bars already attached — eBay listings for this part number are specifically labeled “LTZ Grille Chrome Bars Surround View,” so it is not a bare shell you’d need to add hardware to separately. That’s why the price looks lower than expected: the chrome is already included in what you’re buying.
The fascia ships primed and unpainted. Factor in color-match paint or a body shop trip when you’re budgeting — it won’t look finished off the shelf.
Core Charges on the Headlights
Order the headlamps through a GM dealer and you’ll hit a core charge at checkout. GM collects the old halogen housings for recycling. Return your stock headlights after the swap and the charge gets refunded. Standard procedure — but don’t throw away the old units before that happens.
The Harness: Why You Cannot Skip It
This is the piece that makes the 2024 swap different from what people were doing on 2020-23 trucks. An LT’s factory wiring is built for halogen headlights. Bolt up LTZ LED units without the correct harness and they will not function properly on the LT’s electrical system.
Gen5DIY makes a plug-and-play harness specifically for 2024–2026 Silverado HD trucks that left the factory with halogens. It lets the LED accent strip run as a daytime running light and restores full headlight operation at night. The harness retails for $425.99 (sold as a pair) and typically ships within a few business days of ordering.
A few things to know before you wire it up:
- This harness is for same-year headlight installations only. It will not work for mounting 2020-2023 HD headlights on a 2024 truck — that’s a separate product.
- The lights must run in automatic mode. Manually switching to parking light mode will kill all lighting except the taillights. That’s a known limitation when you’re not running the factory LTZ computer setup that normally drives those functions.
- AutoLEDTech also offers a harness for this conversion if Gen5DIY has a lead-time delay.
Dealer Pricing vs. Online
Dealer quotes on these parts run higher than what shows up through eBay sellers or online GM parts warehouses. The part numbers are standard OEM GM numbers, so the same units appear from multiple third-party sources at lower prices. Once you’ve confirmed the correct numbers for your exact build, shopping online is a straightforward way to save.
One firm rule: double-check that every part number matches your specific year and front-end configuration. The 2024 redesign means headlight and fascia parts from 2020-23 HD trucks are not a drop-in fit on the new body. Mixing generations is where these swaps go wrong.