Auto Chevy Petrol

CHEVY V8 PETROL ENGINES

NISSAN GQ/GU AUTOMATIC TRANSMISSIONS

Marks 4WD Adaptors manufacture conversion kits to replace the standard Nissan TB42, TB45 and TB48 petrol, TD42 and ZD30 diesel engines with GM petrol and diesel V8 engines.

The 4-speed automatic transmission fitted to these vehicles is very durable however performance upgrades will be required for it to satisfactorily handle the power and torque of a V8 diesel engine. The 5-speed automatic transmission is not preferred for this engine conversion as the electronics required to make it perform correctly are not readily available. We would recommend you fit a GM 4L80E automatic transmission in place of the original 5-speed auto when fitting a Chevy diesel engine in place of the 4.8ltr engine.

To enhance your vehicles off road performance and safety we recommend you fit a set of extra low range gears

Engine Kit
Marks 4WD Adaptors manufacture engine conversion kits that allow the fitting of GM V8 engines to the Nissan TB42 and TD42 automatic transmissions. It doesn't matter if a petrol or diesel engine originally powered the vehicle, as the kit will suit either.

NOTE: When replacing engines from Nissan GU Patrols fitted with the 5-speed automatic transmissions we recommend consulting a transmission specialist regarding the ECM/PCM compatibility. Some interface problems have been encountered when fitting V8 Diesel engines.

The kit consists of an adaptor housing which couples the new engine to the original petrol or diesel bellhousing. The new adaptor housing measures 72 mm in length and spaces the new engine away from the irregular shape of the Nissan Patrol firewall.

No firewall modifications or re positioning of the original transmission is required.

The automatic transmission is retained in its original location along with the original torque converter and flex-plate.

A specially machined crankshaft adaptor supplied with the kit that bolts to the rear of the GM engine and flywheel. The adaptor converts the rear crankshaft bolt pattern from GM dimensions to standard Nissan 6 bolt crank dimensions allowing the Nissan flex-plate and torque converter to be connected to the engine.

A standard GM flywheel is needed for the conversion. The use of a GM flex-plate is not recommended as the ring gear can be pushed away from the starter pinion while cranking.

An adaptor housing cover plate, which protects the bottom of the automatic transmission from water and dust entry, as well as all the required bolts, nuts and washers are also supplied with the kit.

When ordering kits to suit the small block Chevy V8 petrol engines it is important that you tell us the flywheel size you intend using with the Chevy engine in order to receive the correct kit.

Note: When a Chevy engine is being fitted it is required that you use the smaller reduction drive starter motor with the conversion. These starter motors are smaller in the main body and will provide greater starter motor to front drive shaft clearance. A McLeod Hi-Torque starter was used on our vehicle and proved to be successful.

Engine Mountings
Engine mounting kits are also available to fit the GM V8 engines. These kits consist of engine mounting rubbers, bolts, and new chassis brackets. The old chassis brackets will need to be cut off the chassis and the new ones welded back on.

The engine mountings have been designed to give you sufficient legal sump to differential clearance when using a rear bowel GM sump.

NOTE: The engine mounting kits will only suit the coil sprung front-end vehicles. Early cab chassis GQ and Ford Maverick vehicles were fitted with leaf springs.

Engine Mounting Rubbers
Two types of engine mounting rubbers are available, standard Chevy type and now a heavy duty rebuildable type using urethane bushes. Click here for details.

New Chevy Bolt In Engine Mountings
We now manufacture engine mounting brackets that bolt directly from the engine block to the original Nissan engine mounting rubbers. Note: These engine mountings can only be used with our MFH8027 headers.

Front Springs
Heavy-duty front springs are recommended with a 25mm bump stop extension to give adequate front drive shaft to adaptor housing clearance.

Chevy Starter Clearance
A Hi Torque starter motor is required when fitting Chevy engines, the standard direct drive type is quite large and can be damaged by the front drive shaft under full suspension compression. We recommend using after market types which allow you to rotate the solenoid to a position above the centre line of the starter or alternately a genuine Chevy type can be used.

Nissan Fan to GM Water Pump Adaptor
The Nissan viscous coupled fan is very effective as the coupling, when heated by the warm air from the radiator, virtually locks the fan directly to the water pump rapidly cooling the engine. Marks 4WD Adaptors manufacture an adaptor kit that easily couples the the Chevy and Holden V8 water pump and pulley to the Nissan viscous coupling and fan. When cooling high performance engines we have found that fitting a Toyota viscous coupling and fan proved to be superior compared to the Nissan type. Marks 4WD Adaptors now have a kit for the Toyota type that includes the fan, viscous coupling and the adaptor.

Kit part numbers are as follows:

CHEVY EFI V8

INSTALLATION PARTS