Extang Trifecta ALX Soft Folding Tonneau Cover for 2019-2027 Chevrolet Silverado 1500 / GMC Sierra 1500 (8' Bed)
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Fits the same truck
See it on a truck
Latches itself when closed
Pebble-grain DualShield vinyl
MegaBows and dual-pivot hinges
Features
- One-Hand Rotary Release: Drop the tailgate, twist the rotary knob on the driver side and lift: the rear panel opens with one hand. Extang says this release is unique among soft tri-fold covers.
- Latches Itself When Closed: Lower the cover onto the bed and the Auto Latching System catches both latches on its own, so there are no tailgate clamps to set every time you close it.
- Folds for 2/3 Bed Access: Fold the cover toward the cab and fasten both buckle straps for about two thirds of the bed. When a load needs every inch, the whole cover comes off in minutes.
- Hand-Tightened Clamps: T-handle clamps hold the cover to the bed rails at the cab. They tighten by hand with no drilling, and loosen the same way when you want the cover off.
- Pebble-Grain DualShield Vinyl: The top is Extang's 50-grade DualShield vinyl, made in two layers with a pebble-grain finish. It is built for long service.
- MegaBows and Dual-Pivot Hinges: Heavy-duty aluminum MegaBows and dual-pivot hinges support the vinyl so rain, hail and snow are less likely to make it sag, and Extang says they reduce wear over time.
Description & Fitment
The Extang Trifecta ALX is a soft tri-fold tonneau cover for the 8' bed of the 2019-2027 Chevrolet Silverado 1500 / GMC Sierra 1500. It is for owners who want one-hand access, since a rotary knob opens it and the latches catch on their own when it closes. It folds in three sections toward the cab, and hand-tightened T-handle clamps hold it on with no drilling. Its pebble-grain DualShield vinyl top sits over an aluminum frame with triple-fin seals, backed by Extang's limited lifetime warranty.
Fitment & Compatibility
| Years | Model | Bed | Notes |
|---|---|---|---|
| 2019 | Silverado 1500 | 8' | New Body |
| 2020-2027 | Silverado 1500 | 8' | — |
| Years | Model | Bed | Notes |
|---|---|---|---|
| 2019 | Sierra 1500 | 8' | New Body |
| 2020-2027 | Sierra 1500 | 8' | — |
Check your bed: measure inside the bed floor from the bulkhead to the inside of the closed tailgate. Extang lists this bed as 8'.
Not for: the 2019-2026 Chevrolet Silverado 1500 5'8" bed (90456); the 2019-2026 Chevrolet Silverado 1500 6'6" bed (90457). Those are separate Trifecta ALX parts. It is also listed as not for beds with factory side storage boxes; if your bed has them, ask us before ordering.
About Extang
Extang is based in Ann Arbor, Michigan. Extang publishes a truck-specific install sheet for each Trifecta ALX version and backs the cover with a limited lifetime warranty.
The Trifecta ALX is Extang's soft tri-fold with the ALX rotary latch, the same one-hand latch used on the hard Solid Fold ALX and the low-profile Endure ALX.
Warranty note. Extang's limited lifetime warranty applies to the original purchaser, with warranty registration on file or a detailed, dated receipt. Keep your order confirmation from us, and contact us for warranty claims and registration help.
Frequently Asked Questions
Will this fit my 2019-2027 Chevrolet Silverado 1500?
Yes, if it has the 8' bed. Measure inside the bed floor from the bulkhead to the inside of the closed tailgate and compare it with the 8' label. If yours is different, look at the 2019-2026 Chevrolet Silverado 1500 5'8" bed (90456). Not sure? Send us your VIN and we'll confirm.
I have a 2019. Which version do I need?
GM sold two bodies in 2019: the new one and the old one as the Silverado 1500 LD / Sierra 1500 Limited. This part fits the new body. Your VIN settles it if you are unsure.
How is the Trifecta ALX different from the Trifecta 2.0?
Both are soft tri-fold covers on an aluminum frame. The Trifecta 2.0 is held shut at the tailgate by spring-loaded EZ-Lock clamps that you release by hand. The ALX replaces those with a rotary knob you turn with one hand to open it, and latches that catch on their own when you close it.
Will it keep rain and snow out of the bed?
It is built to. Extang says the triple-fin seals are part of the frame rather than glued on, and the MegaBows keep the top from sagging under rain, hail and snow. Like any soft folding cover it is weather-resistant rather than watertight. Brush snow and ice off before you fold it; Extang's warranty requires that.
Can I drive with it folded open, or take it off?
Yes to both. Fold it toward the cab and fasten both buckle straps with the tethers attached, and you can drive with about two thirds of the bed open. For the whole bed, loosen the clamps by hand and lift the cover off. Never drive with it partly open.
How do I clean the vinyl?
Use Extang Tonno Tonic or mild soap and water. Skip vinyl conditioners that contain silicone or petroleum: they dry the vinyl out, and Extang's warranty excludes damage from them.
Installation
- T-20 and T-27 Torx wrenches and a 2.5mm hex key (included)
- Tape measure
- Pliers
- Knife
- 1/2" socket or wrench for GM bracket kits
Here's the short version. Follow Extang's install sheet (below) for your GM truck's exact bracket hardware and torque settings.
- Set the cover on the bed. Lay the folded cover over the cab end of the bed, square, with its bulkhead seal on the bulkhead. Unfold it and slide it until the tailgate seal touches the tailgate with its first two fins, then fold it back up without moving it.
- Clear the flange and clamp the front. If a plastic bed-rail cap hangs below the metal bed flange (Extang names 2004-2014 and 2021 F-150s and 2009-2019 Rams, but check any truck), trim just enough plastic for the clamp to reach the metal; never cut into the bed. Then slide each cab clamp to the bed rail, hook its jaw under the metal flange and hand-tighten until it touches, then two more turns. Not on a liner lip or the plastic cap, and no wrench.
- Close the cover and mount the striker brackets. With the tailgate open and both cab clamps tight, close the cover and fit the rear striker brackets with the hardware in your kit so each loop latches into the cover latch. Extang's sheet shows the standard, GM stake-pocket and Maverick bracket versions; use the one your kit contains.
- Adjust the latches and rotary knob. Both latches and the knob leave the factory only partly tightened. Lower the rear of the cover, slide each latch until it catches its striker and lock it from underneath with the T-20 wrench. Leave 3/4"-1" of the driver-side cable through the barrel clamp, tighten the knob screws and the barrel-clamp set screws (2.5mm hex), then turn the knob to check both latches let go. Hand tools only, no power tools.
- Make the final adjustment. Back off the striker bracket bolts or screws, push the closed cover firmly down (or pull the rear bow down) onto the rail and tailgate so the brackets move down, match both sides and retighten.
- Fit the tethers and recheck. The tethers come looped over the cover bow. Slide each tether clamp onto the bed rail as far up as it goes and hand-tighten the knob, both sides. Lift the corners gently to check the cover is latched, and re-tighten the cab clamps and tethers after your first week of driving.
Stuck on a step?
- Trifecta ALX cover assembly (cab clamps, buckle straps and tethers on the cover)
- Rear striker bracket kit for your truck (standard, GM or Maverick hardware)
- T-20 and T-27 Torx wrenches and a 2.5mm hex key
- Install guide
Specifications
| Brand | Extang |
|---|---|
| Part Number | EXT90458 |
| Cover Type | Soft tri-fold |
| Material | 50-grade DualShield two-layer vinyl |
| Finish | Pebble (vinyl) grain, black |
| Frame | Aluminum MegaBows, dual-pivot hinges |
| Latching | Rotary release, auto latching when closed |
| Bed Access | About 2/3 folded; full bed with the cover removed |
| Mounting | Clamp-on, no drilling on most trucks |
| Removal | Tool-free (hand-tightened clamps) |
| Sealing | Integrated triple-fin weather seals |
| Bed Length | 8' box (GM's name), measured 8'2" (97.8") |
| UPC | 750289904581 |
More media
1 videoWarranty, shipping & returns
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Warranty
Extang covers the Trifecta ALX with a limited lifetime warranty against defects in materials and workmanship, starting on the date of purchase.- What's covered: the rails, clamps, bows, aluminum parts, hardware and the vinyl top.
- A defective cover, tarp or part is repaired or replaced, at Extang's choice; Extang may substitute a newer model of similar form and function, or offer a warranty discount on a full replacement system.
- For the original purchaser only, not transferable. Register the cover with Extang, or keep a detailed, dated receipt; contact us for registration help.
- To keep it valid: clean with Extang Tonno Tonic or mild soap and water only (no conditioners with silicone or petroleum); drive only with the cover fully closed and held at all four clamps, or fully folded and buckled at the cab with both tethers attached; never drive with it partly open; keep cargo from touching the cover; clear snow, ice and debris before folding it; check the cab clamps after the first week and from time to time after that; take the cover off before the truck is towed from the rear.
- Claims: get a return authorization number from Extang first and write it on the outside of the package. Shipping to Extang is at your cost, Extang may ask for the part back postage prepaid, and shipping charges apply to any repair or replacement.
- Not covered: accidents, misuse, neglect, improper installation, servicing or removal, normal wear and tear, modifications, acts of God, interference with other accessories or trailers, and consequential or incidental damages.
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Free shipping
Ships free to the lower 48 states, with no minimum order.- Order by 5 PM ET on a business day and it starts processing the same day.
- Because of its size, the cover ships by freight or as an oversized parcel.
- Most orders arrive within 1-5 business days.
- We email your tracking number as soon as it ships.
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Inspect on delivery
This cover ships in a large box. Check it as soon as it arrives.- Look for crushed ends, punctures or tears in the carton.
- If something looks wrong, take photos of the box and the parts (and if a driver asks you to sign, note the damage on the receipt).
- Open the box and check the parts against the parts list before you install.
- Email support@prestigetruck.com right away with your order number, a short note and photos. We send a replacement or a full refund at no cost to you.
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30-day returns
Return it within 30 days of delivery, unused, in the original packaging, with proof of purchase.- Email support@prestigetruck.com with your order number. We reply within 1-2 business days with instructions.
- Damaged, defective or wrong item: we send a prepaid label or arrange a pickup.
- Changed your mind: you pay return shipping. No restocking fee.
- Refunds go back to your original payment method within 7 business days of approval. See our returns policy.