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My 150 mph rallye speedometer in 72 RR is reading way too low. Says I'm doing 20 MPH when I'm doing about 50 (hello officer). Based on tire size (295 50 15) and 3.91 gears, I need a 38 tooth gear. I pulled gear and it's an orange 40 tooth gear (part number 52068062). So I'm close to the right...

Does anyone have experience putting on 11.75 inch rotors with 15 inch Weld Draglites? Will they clear?

I have seen different answers to this, so I ask: Do I need a pinion snubber on a 1972 RR with built 340/727/8 3/4 3.91 with stock leaf springs and Bilstein shocks that will only be street driven?

I am going to upgrade wiring on 1972 RR with Mad ammeter bypass. I am running an 8 gauge wire from 75 amp alternator to a 12 gauge fusible link at starter relay. But can someone please explain why the two 10 gauge wires coming from the bypassed ammeter and through drilled holes in bulkhead...

I'm going to upgrade my wiring on my 72 RR and doing the Mad ammeter bypass first. How do I get these little buggers to disconnect? I know there's a plastic clip that I need to spring with a tiny screwdriver or long T pin. Using the top white wire (that's been cut) as an example, is the clip (as...

On my wiring diagram for 72 Satellite/Roadrunner, the "No. 20" spot on the bulkhead connector is empty. I've checked other diagrams and No. 20 is same way. No wire. But I have a blue wire there. Have no idea where it goes or what does. Haven't torn anything apart to trace it, but are the...

Hello everyone. Looking for some help. My 72 Roadrunner 340 will not charge the battery. Staying at 12.6 V when off and when running. Battery, alternator are tested and good. Voltage regulator is new and grounded. But when car is running or when key is at "run" I get zero volts from both...