Used 2018 GMC Sierra 1500 transmission – AT, 4x4, 5.3L, 8 speed, opt M5X

Year & trim-specific price guide

Used 2018 GMC Sierra 1500 Transmission — AT, 4x4, 5.3L, 8 speed, opt M5X prices

Trim-specific pricing for the AT, 4x4, 5.3L, 8 speed, opt M5X variant of the 2018 GMC Sierra 1500 transmission, built from 41 real salvage yard listings with condition grade detail.

2018 GMC Sierra 1500 · AT, 4x4, 5.3L, 8 speed, opt M5X

$3,170

median asking price

41 priced listings · $2,348–$7,635

Price summary

A used 2018 GMC Sierra 1500 transmission (AT, 4x4, 5.3L, 8 speed, opt M5X) costs $2,348 to $7,635, with a median asking price of $3,170. Based on 41 priced salvage yard listings across the US, updated Aug 18, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$3,148
Grade B (good)$2,875

2018 GMC Sierra 1500 transmission — AT, 4x4, 5.3L, 8 speed, opt M5X price snapshot

USD
Low
$2,348
Average
$3,901
High
$7,635
41 priced listings used · last updated Aug 18, 2026· How we price·

Report incorrect price

Reporting price for 2018 GMC Sierra 1500 Transmission (AT, 4x4, 5.3L, 8 speed, opt M5X)

Reason

Condition comparison

Price by part grade

Grade AClean / low wear$2,900–$3,72217 listings
Grade BStandard used$2,348–$3,1607 listings
Grade CVisible wearUpdating
Grade XUngraded$2,900–$7,63517 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $2,348–$7,635 overall range

Trim-specific context

How does the AT, 4x4, 5.3L, 8 speed, opt M5X compare?

This pricing covers the AT, 4x4, 5.3L, 8 speed, opt M5X variant of the 2018 GMC Sierra 1500 transmission, based on 41 priced listings. Its $3,170 median is 20% above 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, 5.3L, 8 speed, opt M5X in other model years

All years
201715 listings$3,000$2,100 – $4,663

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), 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), 4x4, 4.3L

37 listings$1,599$1,000 – $2,055

(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, 5.3L, 8 speed, opt M5X) FAQ

How much is a used 2018 GMC Sierra 1500 transmission (AT, 4x4, 5.3L, 8 speed, opt M5X)?

Based on 41 priced salvage-yard listings, a used 2018 GMC Sierra 1500 transmission in the AT, 4x4, 5.3L, 8 speed, opt M5X variant lists between $2,348 and $7,635, with a median asking price of $3,170.

Which years use the AT, 4x4, 5.3L, 8 speed, opt M5X transmission?

The AT, 4x4, 5.3L, 8 speed, opt M5X variant appears in model years 2017, 2018. Prices and availability may differ by year.