---
id: 20261001_155500_stant-27140-gmc-r2500-suburban-1987-1991
title: Stant 27140 Thermostat Gasket for GMC R2500 Suburban (1987–1991)
category: Parts Catalog
corpus_topic: PartsCatalog
summary: 'Stant 27140 (BB40) Stat Lok adhesive-backed thermostat gasket, made in the USA, fitting the GMC R2500 Suburban (1987–1991). Offered by Don and Kathy Leask of Don''s Obsolete Auto Parts, restoration parts sellers online since 1997. No list price: buyers deal one on one with Don and Kathy.'
description: 'Stant 27140 (BB40) Stat Lok adhesive-backed thermostat gasket, made in the USA, fitting the GMC R2500 Suburban (1987–1991). Offered by Don and Kathy Leask of Don''s Obsolete Auto Parts, restoration parts sellers online since 1997. No list price: buyers deal one on one with Don and Kathy.'
question: Will the Stant 27140 thermostat gasket fit my GMC R2500 Suburban, and who can I buy it from?
keypoints:
- GMC R2500 Suburban (1987–1991)
tags:
- stant
- stant-27140
- bb40
- thermostat-gasket
- stat-lok
- made-in-usa
- restoration-parts
- obsolete-auto-parts
- gmc
- gmc-r2500-suburban
consent: true
agent: misty
created: '2026-10-01T22:57:23Z'
updated: '2026-10-01T22:57:23Z'
date: '2026-10-01'
vault_stage: 07_CODEX
enrich_status: ok
enrich_method: bot
enrich_blockers: []
pipeline_filename: stant-27140-gmc-r2500-suburban-1987-1991.md
source_kind: authored
proposed_topic: PartsCatalog
lane: PartsCatalog
content_status: approved
routing_source: carbon
prefix: misty
headwaters: misty
asker_site: dkleask.com
sample: false
sentiment: helpful
emotions:
- reassured
- nostalgic
- confident
sycophancy: 0
truth_score: 9
entropy: 3
predicted_narrative_arc: owner-searching-to-part-found
part_number: Stant 27140
vehicle_make: GMC
vehicle_model: GMC R2500 Suburban
---

# Stant 27140 Thermostat Gasket for GMC R2500 Suburban, 1987–1991

GMC trucks were the professional-grade cousins of Chevrolet trucks, built side by side and often sharing the same engines and cooling parts.

This page is for one model only: the GMC R2500 Suburban. It isn't a wall of every car ever made, just yours.

## Model this gasket fits

- GMC R2500 Suburban (1987–1991)

## Help choosing the right gasket

The 27140 (also marked BB40) is a Stant Stat Lok thermostat gasket, made in the USA. "Stat Lok" means it has an adhesive backing that holds the thermostat centered in its seat while you bolt the housing down, so there's no gasket cement, no thermostat falling out, and less risk of cracking the outlet flange. Its sister parts, the 27150 and 27167, fit different engine families, so check which number your car calls for.

Before you order, match three things: your year, your model, and your engine. Catalogs list fitment by vehicle, but some engines had more than one thermostat housing design over the years. If your old gasket is still in hand, compare its shape and bolt holes, or just ask Don and Kathy. They'll help you sort it out.

## Real people behind the parts

Don and Kathy Leask have been selling obsolete and restoration auto parts online since 1997. Their eBay store, carparts2, was the second auto parts store on eBay. Over the years it grew into one of the biggest online sources of obsolete parts, with something like 11,000 to 17,000 unique parts listed.

These gaskets come from Don's own shelves, in original Stant bags marked Made in USA.

## No list price. Let's make a deal.

Don and Kathy don't do fixed prices on these. It works like a good swap meet: tell them what you need and how many, and they'll work out a fair deal with you one on one. Buying for a club, a shop, or a whole fleet of project cars? Even better.

**To reach them, click the "Don & Kathy Leask" button at the bottom left of any page on dkleask.com.**