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change the ignition switch.
How do I replace an Ignition in a 1970 Maverick
Remove the distributor cap. Remove the hose to the vacuum advance. Remove the two screws holding the vacuum advance on. Install in reverse order.
several special tools are REQUIRED to perform this task, which involves removing the steering wheel.
The first Column ignitions switch was introduced on GM cars in 1968 for the 1969 Model year...Ford and Chrysler introduced it in 1969 for the 1970 model year..
You will have to remove the horn pad and the steering wheel which requires a special puller. Then you need a compressor for depressing the wheel lock. Remove the turn signal switch and there will be a slot to insert a small blade screw driver. Depress the pin and pull the lock cylinder out. Insert the new one and you will feel it lock in place.
MSD Ignition was created in 1970.
One place to get parts for a 1970 Pontiac Grand Prix is at the website Stock Interiors.
REmove the steering wheel then the lock plate. Then the t/s switch. Remove the key reminder contacts and there is a screw with a different head close to the lock cyl. Remove this screw and the lock cyl will come out. You will need a puller for the steering wheel and a tool for the lock plate both rentable from the parts store.
There were 2,170 convertible GTOs in 1970.
A 1970 Pontiac Service Manual will have this info in it. You can find them on Ebay or one of the literature places on the web.
Weight on my Pontiac LeMans Sport registration is 3800