Used 2021 GMC Sierra 1500 transmission – AT, 4x2, 4.3L

Year & trim-specific price guide

Used 2021 GMC Sierra 1500 Transmission — AT, 4x2, 4.3L prices

Trim-specific pricing for the AT, 4x2, 4.3L variant of the 2021 GMC Sierra 1500 transmission, built from 44 real salvage yard listings with condition grade detail.

2021 GMC Sierra 1500 · AT, 4x2, 4.3L

$2,145

median asking price

44 priced listings · $350–$2,866

Price summary

A used 2021 GMC Sierra 1500 transmission (AT, 4x2, 4.3L) costs $350 to $2,866, with a median asking price of $2,145. Based on 44 priced salvage yard listings across the US, updated Aug 8, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$2,300
Grade B (good)$1,990

2021 GMC Sierra 1500 transmission — AT, 4x2, 4.3L price snapshot

USD
Low
$350
Average
$2,105
High
$2,866
44 priced listings used · last updated Aug 8, 2026· How we price·

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Reporting price for 2021 GMC Sierra 1500 Transmission (AT, 4x2, 4.3L)

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Condition comparison

Price by part grade

Grade AClean / low wear$350–$2,7348 listings
Grade BStandard used$1,645–$2,69721 listings
Grade CVisible wearUpdating
Grade XUngraded$1,565–$2,86615 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $350–$2,866 overall range

Trim-specific context

How does the AT, 4x2, 4.3L compare?

This pricing covers the AT, 4x2, 4.3L variant of the 2021 GMC Sierra 1500 transmission, based on 44 priced listings. Its $2,145 median is 21% below the 2021 GMC Sierra 1500 transmission overall median of $2,700.

There are 13 other transmission variants available for the 2021 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, 4x2, 4.3L in other model years

All years
202037 listings$1,808$1,350 – $2,787201839 listings$1,600$905 – $2,279201727 listings$1,805$1,248 – $3,400

Same year, other trims

What other 2021 GMC Sierra 1500 transmission variants are available?

(AT), 4x4, 5.3L, 8 speed transmission (opt MQE)

47 listings$3,441$1,900 – $4,527

(AT), 4x4, 2.7L

46 listings$3,448$2,800 – $5,723

(AT), 4x2, 2.7L

45 listings$2,850$1,800 – $4,414

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

45 listings$2,950$1,900 – $4,414

(AT), 4x4, 5.3L, 10 speed transmission (opt MQB), w/o opt NSS

43 listings$2,450$1,465 – $3,744

(AT), 4x4, 6.2L, w/o opt NSS

43 listings$2,450$1,465 – $3,744

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

42 listings$2,450$1,850 – $3,150

(AT), 4x4, 4.3L

40 listings$2,091$1,200 – $3,245

(AT), 4x4, 5.3L, 6 speed transmission (opt MYC)

40 listings$3,250$2,310 – $4,450

(AT), 4x4, 5.3L, 10 speed transmission (opt MQB), opt NSS

32 listings$2,200$1,200 – $3,680

(AT), 4x4, 6.2L, opt NSS

32 listings$2,200$1,200 – $3,680

(AT), 4x4, 3.0L

30 listings$2,792$850 – $4,177

(AT), 4x2, 3.0L

5 listings$2,600$1,848 – $2,955

Back to full guide

2021 GMC Sierra 1500 transmission — all trims

View 2021 guide

Common questions

2021 GMC Sierra 1500 transmission (AT, 4x2, 4.3L) FAQ

How much is a used 2021 GMC Sierra 1500 transmission (AT, 4x2, 4.3L)?

Based on 44 priced salvage-yard listings, a used 2021 GMC Sierra 1500 transmission in the AT, 4x2, 4.3L variant lists between $350 and $2,866, with a median asking price of $2,145.

Which years use the AT, 4x2, 4.3L transmission?

The AT, 4x2, 4.3L variant appears in model years 2017, 2018, 2020, 2021. Prices and availability may differ by year.