6 Speed Saab MR6/F40 Pontiac G6 GTP F40 Manual Swap: Parts Guide

[Robert]

Application: Because GM used this pattern for decades across multiple brands, you have a massive list of potential engines that will bolt up to the F40 transmission.

Direct Bolt-On Engines (60° V6 Pattern)​

These engines share the exact same mounting flange. Note that while they bolt up, you may still need to account for flywheel/clutch spacing and starter location.

High Value V6 (Pushrod)​

• 3.9L (LZ9): The original engine.
• 3.5L (LX9, LZ4, LZE): Found in G6, Malibu, and Impala.
• 3.4L (LA1): Found in Grand Am, Alero, and various minivans.
• 3.1L (L82, LG8): Found in Lumina, Malibu, and Grand Prix.
• 2.8L (L98): The original 60-degree V6 from the 1980s (Celebrity, Citation).

3800 Series II & III V6 (90° V6)​

• 3.8L (L36): Naturally aspirated.
• 3.8L (L67 / L32): Supercharged (GTP, Regal GS, Bonneville SSEi).

High Feature V6 (DOHC)​

• 3.6L (LY7 / LLT): Used in the G6 GXP and early Camaros/Cadillacs.
• 2.8L (LP1): Turbo version found in Saab 9-3 Aeros (which also used the F40).

The "Oddballs" & V8s​

• 5.3L LS4 V8: The only LS-series V8 with this pattern (Found in Impala SS, Monte Carlo SS, Grand Prix GXP). Note: The F40 requires housing clearancing for the LS4 starter.
• 3.5L LX5 "Shortstar": The DOHC V6 version of the Northstar V8 (Found in Olds Intrigue).
• 2.2L Ecotec (L61): Some early versions used this pattern, but most use the Ecotec-specific pattern.
• 2.5L "Iron Duke" I4: Found in S10s and Fieros.

 

[Robert]

1. Drivetrain & Axles​

The F40 6-speed is a high-torque unit. It requires a specific manual-only "jackshaft" and matching axles.

Component	GM Part Number	Notes
F40 6-Speed Transmission	55562951	Option code MU9.
F40 6-Speed Transmission	55561229	(3.55 Final Drive Ratio)
Intermediate Shaft (Jackshaft)	22668353	Essential to bridge the block to the pass. axle.
Driver Side CV Axle	15918504	Manual-specific length.
Passenger Side CV Axle	15918505	Connects to the jackshaft.
Output Shaft Seals (x2)	90354481	Recommended new for the swap.
Upper Trans Mount	15299173	Manual-specific mounting bracket.

2. Clutch & Flywheel​

The 3.9L LZ9 uses a Dual Mass Flywheel (DMF).

Component	GM Part Number	Notes
Dual Mass Flywheel	12586675	Specific to the 3.9L crank pattern.
Clutch Kit (Disc/Plate)	12586672	OEM spec (LuK equivalent: 04-251).
Flywheel Bolts (x8)	11588785	One-time use (Stretch Bolts).
Pressure Plate Bolts (x6)	11561081	Recommended new.

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3. Shifter & Interior​

The automatic shift assembly must be replaced entirely.

Component	GM Part Number	Notes
Shifter Assembly	15296498	Complete manual floor unit.
Shifter Cables	15788845	Dual cable set.
Shifter Boot / Bezel	15277861	Replaces the automatic PRNDL trim.
Shifter Knob	15281146	Original GTP 6-speed knob.

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4. Hydraulics & Pedal Assembly​

You will need to drill the firewall indentation to mount the master cylinder.

Component	GM Part Number	Notes
Pedal Assembly (Brake/Clutch)	15274154	Combined bracket with both pedals.
Clutch Master Cylinder	15275811	Mounts to the firewall.
Slave Cylinder (TOB)	24240351	Concentric unit inside the bellhousing.
Main Clutch Line	15275820	High-pressure line (Master to Slave).
Reservoir Feed Hose	15275813	Feeds fluid from the brake reservoir.

 

[Robert]

Useful Links:
(OTP) F40 Swap Kit
(ZZP) F40 Transmission New
(ZZP) F40 Swap Kit
NOTE: Links are provided for reference only; details may vary depending on the application.