Used 2018 GMC Sierra 1500 transmission – AT, 4x4, 4.3L

Year & trim-specific price guide

Used 2018 GMC Sierra 1500 Transmission — AT, 4x4, 4.3L prices

Trim-specific pricing for the AT, 4x4, 4.3L variant of the 2018 GMC Sierra 1500 transmission, built from 37 real salvage yard listings with condition grade detail.

2018 GMC Sierra 1500 · AT, 4x4, 4.3L

$1,599

median asking price

37 priced listings · $1,000–$2,055

Price summary

A used 2018 GMC Sierra 1500 transmission (AT, 4x4, 4.3L) costs $1,000 to $2,055, with a median asking price of $1,599. Based on 37 priced salvage yard listings across the US, updated Aug 18, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$1,600
Grade B (good)$1,345
Grade C (fair)$1,700

2018 GMC Sierra 1500 transmission — AT, 4x4, 4.3L price snapshot

USD
Low
$1,000
Average
$1,598
High
$2,055
37 priced listings used · last updated Aug 18, 2026· How we price·

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Condition comparison

Price by part grade

Grade AClean / low wear$1,375–$2,05511 listings
Grade BStandard used$1,000–$1,69515 listings
Grade CVisible wear$1,700–$1,7001 listings
Grade XUngraded$1,450–$2,00810 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $1,000–$2,055 overall range

Trim-specific context

How does the AT, 4x4, 4.3L compare?

This pricing covers the AT, 4x4, 4.3L variant of the 2018 GMC Sierra 1500 transmission, based on 37 priced listings. Its $1,599 median is 39% below the 2018 GMC Sierra 1500 transmission overall median of $2,642.

There are 13 other transmission variants available for the 2018 GMC Sierra 1500.

Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.

Same trim, other years

AT, 4x4, 4.3L in other model years

All years
202140 listings$2,091$1,200 – $3,245202041 listings$1,940$1,350 – $2,850201744 listings$1,550$998 – $3,400

Same year, other trims

What other 2018 GMC Sierra 1500 transmission variants are available?

(AT), 4x2, 5.3L, 6 speed (opt MYC), w/o tow package

48 listings$2,235$1,455 – $3,662

(AT), 4x4, 6.2L, 8 speed (opt M5U)

44 listings$3,055$2,000 – $3,885

(AT), 4x4, 5.3L, 8 speed, opt M5U

42 listings$3,640$2,605 – $4,470

(AT), 4x4, 5.3L, 8 speed, opt M5X

41 listings$3,170$2,348 – $7,635

(AT), 4x2, 4.3L

39 listings$1,600$905 – $2,279

(AT), 4x4, 5.3L, 6 speed (opt MYC), w/o tow package

39 listings$2,375$1,785 – $3,350

(AT), 4x2, 6.2L, 10 speed (opt MF6)

38 listings$2,675$1,493 – $5,342

(AT), 4x2, 5.3L, 8 speed, opt M5U

33 listings$3,012$2,504 – $5,634

(AT), 4x4, 6.2L, 10 speed (opt MF6)

33 listings$2,450$1,750 – $4,676

(AT), 4x2, 5.3L, 8 speed, opt M5X

32 listings$3,910$1,707 – $6,500

(AT), 4x4, 5.3L, 6 speed (opt MYC), tow package (opt NHT)

27 listings$2,150$1,900 – $3,350

(AT), 4x2, 5.3L, 6 speed (opt MYC), tow package (opt NHT)

19 listings$2,338$1,950 – $3,225

(AT), 4x2, 6.2L, 8 speed (opt M5U)

10 listings$4,414$2,450 – $5,639

Back to full guide

2018 GMC Sierra 1500 transmission — all trims

View 2018 guide

Common questions

2018 GMC Sierra 1500 transmission (AT, 4x4, 4.3L) FAQ

How much is a used 2018 GMC Sierra 1500 transmission (AT, 4x4, 4.3L)?

Based on 37 priced salvage-yard listings, a used 2018 GMC Sierra 1500 transmission in the AT, 4x4, 4.3L variant lists between $1,000 and $2,055, with a median asking price of $1,599.

Which years use the AT, 4x4, 4.3L transmission?

The AT, 4x4, 4.3L variant appears in model years 2017, 2018, 2020, 2021. Prices and availability may differ by year.