2021 GMC Sierra SLT

VIN 3GTP8DET6MG129833

This 2021 GMC Sierra SLT is listed at $30,465 with 90,022 miles in McGregor, TX.

GOOD DEAL $3,991 below typical price Asking $30,465 · typical market price $34,456 · based on 10 comparable same-build listings.

VehiLeaks · Vehicle History Report

The full history of this 2021 GMC Sierra SLT

VIN 3GTP8DET6MG129833 · one-time $6, no subscription

Reported accidents & damage
Title brands — salvage, flood, lemon
Odometer readings over time
Every past listing: price, dealer, photos

Pickup 3.0L V6 4x2 Diesel

$6 one-time

Get the full report → Instant access after checkout

Market Price Range

Below market

$29,428

Typical price

$34,456

Above market

$35,733

Based on 10 comparable same-build listings.

This vehicle: $30,465 — $3,991 below the typical market price ($34,456)

Market data as of August 16, 2026

See all 2021 GMC Sierra prices — typical $34,456 →

Vehicle Decode

Body: Pickup
Engine: 3.0L · V6 · Diesel
Drive: 4x2
Doors: 4
Made by: GENERAL MOTORS LLC

Look up the factory Monroney sticker by VIN →

Safety

✗ Backup camera
✗ Blind-spot monitor
✗ Lane departure
✗ ABS
✗ Electronic stability

Price history for this VIN

Price dropped $225 (−0.7%) over 3 days.

Aug 5, 2026 · $30,690 Aug 8, 2026 · $30,465

Asking prices recorded across 2 listing dates for VIN 3GTP8DET6MG129833, spanning 3 days.

Safety & ownership

EPA fuel economy (MPG)

City

Highway

Combined

Est. fuel cost: $1,790/year

Assumes 15,000 miles a year at $3.10/gallon and 26 MPG combined.

Model-level data for the 2021 GMC Sierra from NHTSA (recalls, NCAP crash tests) and EPA fueleconomy.gov, refreshed July 28, 2026.

Active listings

Full listing history on VehiSales →

Dealer	Location	Price	Mileage	Listed
Stanley Ford-McGregor	McGregor, TX 76657	$30,465	90,022 mi	2026-08-08
Stanley Ford McGregor	MC Gregor, TX 76657	$30,690	90,022 mi	2026-08-05

What would this 2021 GMC Sierra SLT cost per month?

Estimate the monthly payment on a $30,465 vehicle. Move the numbers to match your own loan.

Vehicle price

Down payment

10% down

Interest rate (APR)

7.0% is a typical rate for a well-qualified buyer — use your own quote if you have one.

Loan term

Estimated monthly payment

$543

per month

60 months · 7.0% APR · $3,047 down

Amount financed

$27,418

Total interest

$5,162

Estimate only. Excludes tax, title, registration and dealer fees, and assumes a fixed-rate loan with equal monthly payments. Your actual rate depends on your credit and lender.

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