Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Pontiac LeMans GSE, AutomaticFACTORY OEM SERVICE PROCEDURE
Overhaul & Testing - 125C/3T40: Applications
THM 3T40 APPLICATIONS
| Application | Engine | |
|---|---|---|
| Buick | ||
| Century | 2.5L, 2.8L & 3.3L | |
| Skyhawk | 1.8L & 2.0L | |
| Skylark | 2.3L, 2.5L, 3.0L & 3.3L | |
| Somerset | 2.5L & 3.0L | |
| Cadillac | ||
| Cimarron | 1.8L, 2.0L & 2.8L | |
| Chevrolet | ||
| Beretta | 2.2L, 2.3L & 3.1L | |
| Cavalier | 2.0L, 2.2L & 3.1L | |
| Celebrity | 2.5L, 2.8L & 4.3L | |
| Citation | 2.5L & 2.8L | |
| Corsica | 2.2L, 2.3L, 2.8L & 3.1L | |
| Lumina | 2.5L & 3.1L | |
| Lumina APV | 3.1L | |
| Oldsmobile | ||
| Achieva | 2.3L & 3.3L | |
| Cutlass Calais | 2.3L, 2.5L & 3.3L | |
| Cutlass Ciera & Cutlass Cruiser | 2.5L & 3.3L | |
| Cutlass Supreme | 2.3L & 3.1L | |
| Firenza | 1.8L & 2.8L | |
| Omega | 2.5L & 2.8L | |
| Silhouette | 3.1L | |
| Pontiac | ||
| Fiero | 2.5L & 2.8L | |
| Grand Am | 2.3L, 2.5L & 3.3L | |
| Grand Prix | 2.3L & 3.1L | |
| LeMans | 1.6 & 2.0L | |
| Phoenix | 2.5L & 2.8L | |
| Sunbird | 1.8L, 2.0L & 3.1L | |
| Trans Sport | 3.1L | |
| 6000 | 2.5L, 2.8L & 3.1L & 4.3L | |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.