Track Builder Unlimited 5-Pack · 1/51/5
Track Builder Unlimited 5-Pack2020
Illustration · have this car? Upload a photo belowGKC53
Track Builder Unlimited 5-Pack
Hot Wheels What-4-2 Transparent Blue 2020 · Track Builder Unlimited 5-Pack
The Hot Wheels What-4-2 was released in 2020 in the 5-Packs line (Track Builder Unlimited 5-Pack), toy number GKC53.
- Toy #
- GKC53
- Year
- 2020
- Product line
- 5-Packs · Track Builder Unlimited 5-Pack
- Casting
- What-4-2
- Designer
- Phil Riehlman
- Color
- Transparent Blue · clear
- Tampo
- Yellow / White / Orange HW logo and Triangle Design on side.
- Base
- Red / Metal
- Window
- Yellow tint
- Interior
- Chrome
- Wheels
- Orange Tire, Yellow Y5 · Y 5 Spoke Wheel
- Country
- Indonesia
- Status
- Regular
- Notes
- Base code(s): M45, N03, N07, P15 · What-4-2
Our reading: base codes M45, N03, N07, P15 – pressed between week 45 of 2019 and week 15 of 2021. Our own interpretation of 13,498 codes in this database, not a statement by Mattel. How we read the base code.
Themed packs of five cars – often in colors you cannot buy as single cars.
Paint: Transparent Blue; wheels: Orange Tire, Yellow Y5 (Y 5 Spoke Wheel); made in Indonesia.
The What-4-2 casting first appeared in 2004 and has 41 releases in our database, most recently in 2025.
The Track Builder Unlimited 5-Pack series of 2020 has 5 castings, listed here in 8 releases.
Not unboxed yet
We have not had this car on the channel yet. Request it – the most requested cars get unboxed first.
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Collector notes
What collectors know about this car: variants, finds, cards, wheels, colours.
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Frequently asked questions
What is the toy number of the Hot Wheels What-4-2?
The toy number is GKC53 (2020). It is printed on the back of the card.
Which series is the Hot Wheels What-4-2 from?
It was released in 2020 in the 5-Packs line, series “Track Builder Unlimited 5-Pack”.
Has Wheel Wonderland unboxed the What-4-2?
Not yet – you can request it on this page.
What-4-2: 41 versions
The 10 closest versions – see all on the casting page.
| Model | Series | Series # | Toy # | Color | Year | ||
|---|---|---|---|---|---|---|---|
| What-4-2FKT65 | X-Raycers 5-Pack | 2/5 | FKT65 | 2018 | |||
| What-4-2FPC60 | Color Shifters | FPC60 | 2018 | ||||
| What-4-2FKT65 · Translucent Red | X-Raycers 5-Pack (2018) | FKT65 | Translucent Red | 2018 | |||
| What-4-2GHP53 | Track Builder Unlimited 5-Pack | 5/5 | GHP53 | 2020 | |||
| What-4-2GKC53 · Transparent Blue | Track Builder Unlimited 5-Pack | GKC53 | Transparent Blue | 2020 | |||
| What-4-2GKC53 · Transparent Blue | Track Builder Unlimited 5-Pack (2020) | GKC53 | Transparent Blue | 2020 | |||
| What-4-2HHY74 | Stunt Tire Monster Truck | 1/6 | HHY74 | 2021 | |||
| What-4-2HHH57 | Ultimate Smash Pack | 6/9 | HHH57 | 2022 | |||
| What-4-2FPC60 | Color Shifters | FPC60 | 2022 | ||||
| What-4-2HDH77 · Clear green | Halloween Series (2022) | 4/5 | HDH77 | Clear green | 2022 |
2 records for toy # GKC53
Same toy number, same name, same release year – different paint. We grouped these ourselves; the wiki does not number them.
| Model | Series | Toy # | Color | ||
|---|---|---|---|---|---|
| What-4-2GKC53 · Transparent Blue | Track Builder Unlimited 5-Pack (2020) | GKC53 | Transparent Blue | ||
| What-4-2GKC53 · Transparent Blue | Track Builder Unlimited 5-Pack | GKC53 | Transparent Blue |
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This page last changed: Oct 10, 2026. The Hot Wheels database behind it is our own and is updated daily – releases from 1968 onwards plus our own unboxing videos.