Used 2018 GMC Sierra 1500 transmission – (AT), 4x4, 5.3L, 8 speed, opt M5U

Year & trim-specific price guide

Used 2018 GMC Sierra 1500 Transmission — (AT), 4x4, 5.3L, 8 speed, opt M5U prices

Trim-specific pricing for the (AT), 4x4, 5.3L, 8 speed, opt M5U variant of the 2018 GMC Sierra 1500 transmission, built from 42 real salvage yard listings with condition grade detail.

2018 GMC Sierra 1500 · (AT), 4x4, 5.3L, 8 speed, opt M5U

$3,640

median asking price

42 priced listings · $2,605–$4,470

Price summary

A used 2018 GMC Sierra 1500 transmission ((AT), 4x4, 5.3L, 8 speed, opt M5U) costs $2,605 to $4,470, with a median asking price of $3,640. Based on 42 priced salvage yard listings across the US, updated Aug 18, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$3,795
Grade B (good)$3,100

2018 GMC Sierra 1500 transmission — (AT), 4x4, 5.3L, 8 speed, opt M5U price snapshot

USD
Low
$2,605
Average
$3,531
High
$4,470
42 priced listings used · last updated Aug 18, 2026· How we price·

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Reporting price for 2018 GMC Sierra 1500 Transmission ((AT), 4x4, 5.3L, 8 speed, opt M5U)

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Condition comparison

Price by part grade

Grade AClean / low wear$2,850–$4,47031 listings
Grade BStandard used$2,605–$3,65410 listings
Grade CVisible wearUpdating
Grade XUngraded$3,670–$3,6701 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $2,605–$4,470 overall range

Trim-specific context

How does the (AT), 4x4, 5.3L, 8 speed, opt M5U compare?

This pricing covers the (AT), 4x4, 5.3L, 8 speed, opt M5U variant of the 2018 GMC Sierra 1500 transmission, based on 42 priced listings. Its $3,640 median is 38% 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 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 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), 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 M5U) FAQ

How much is a used 2018 GMC Sierra 1500 transmission ((AT), 4x4, 5.3L, 8 speed, opt M5U)?

Based on 42 priced salvage-yard listings, a used 2018 GMC Sierra 1500 transmission in the (AT), 4x4, 5.3L, 8 speed, opt M5U variant lists between $2,605 and $4,470, with a median asking price of $3,640.

Which years use the (AT), 4x4, 5.3L, 8 speed, opt M5U transmission?

In our current dataset, the (AT), 4x4, 5.3L, 8 speed, opt M5U variant appears only for the 2018 model year.