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3.4/3.8 V6 to LT1

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Phone (256) 463-7463, E-mail : parts@tacreationsusa.com


    Perhaps are largest amount of e-mail questions and phone calls is based on the requirements to install an LT1 into a 3.4/3.8 equipped F-body.  Unless you decide to wire it yourself, you will need the entire chart below***.  The swap is broken down into 2 charts.  The first chart is a requirement regardless of year, meaning all the parts are required for installation.  The second chart is year specific, meaning that you will need to specifically change those parts based on the year of the donor engine/transmission.  You will need these parts in addition to the first chart.  Generally speaking, we suggest having an entire donor car for the swap.

Mandatory components required for the swap

Component Reason
Complete engine assembly Every component is different with the exception of the tensioner and A/C compressor which interchange on the 3.4's.  Nothing interchanges on the 3.8
Transmission The Bolt pattern is completely different from V6 to V8
Engine Cradle An LT1 engine cradle is formed different to sit lower.  The use of the LT1 mounts is also required.

3.4 & 3.8 V6 radiator, w/o steam line and heater line  LT1 radiator, with heater hose and steam line

The LT1 radiator uses an additional steam line on the RH tank, and a oil cooler/heater return line on the LH tank.  LT1's also use a low coolant sensor.
Fuel Pump Assembly Although the V6's and V8's operate at the same PSI, the V8's use a higher volume. 
Gauge Cluster The speed reading is different, and the tach reading is different.  Not changing the clusters will cause the tach reading to be erratic.   Oil PSI and water temperature readings are also different.
Harnesses The engine harness & PCM are all required changes. 
Hoses Because the LT1 is reverse flow cooling, the coolant hoses are in different locations and have bleeders installed.  The A/C hose is also different.
Suspension LT1 coil springs are required from the added weight.  Your vehicle will sit low if you do not change the springs, but also have poor handling since springs are rated for a certain weight.
Brakes There is no requirement to change brakes, although all the LT1 cars are equipped with rear disc brakes.  ASR/Traction control equipped LT1's will require a rear-end change to correctly operate the ASR system.

Other components required, specific to year:

3.4/3.8 to LT1 Year of LT1 engine/transmission donor vehicle
1993 1994 1995 1996 1997
Vehicle Year 1993 Y N N N Y N N Y Y N N Y Y Y N Y Y Y Y Y
1994 Y N N Y Y N N N Y N N Y Y Y N Y Y Y Y Y
1995 Y N N Y Y N N Y Y N N N Y Y N Y Y Y Y Y
1996 N Y N Y N Y N Y N Y N Y N N N N N Y Y Y
1997 N Y Y Y N Y Y Y N Y Y Y N N Y Y N N N N

Legend : Y = Yes (Requires Change), N = No (Requires no change)

  • F (Cooling Fans) - LT1's use dual cooling fans.

  • A (Airbag Sensors) - 93-95 models use a 3 sensor system, 96-97 use a single sensor system.

  • D (Dash Assembly) - 97 uses a totally different dash VS the 93-96 Camaros.  Firebirds do not need to change the dash.

  • W (Wiring) - All the wiring (Relay harness, dash harness, etc).

***Note - Swaps can be performed in many methods, including and excluding many parts.  The charts above are just suggestions of the staff at Trans Am Creations for proper trouble free installation and reliability.

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