[Nick88lx]

Hey , i was just wondering if anyone out there is using 3.42's in their rear end .. i just pick up a ring and pinion out of a police cruiser ( we reb0uilt the rear end in the dealership) and i was just wondering what people had to do to get the speedo back in sync? because i cannot get a speedo gear for the gear ratio and i like my speedo being right on the money

[Jarrett]

Are they out of a 7.5" rear axle?
That was the last place I knew of a set of 3.42's.

[Nick88lx]

nope they are out of an 8.8 axle ... its from the Police interceptor package

[FoxChassis]

Never heard of a 3.42:1 axle ratio for either a 7.5" rear or an 8.8" rear.

As far as I know, the latest generation P71 CVs come with either 3.27:1 or 3.55:1 gearset ratios.

[Nick88lx]

no actually according to our Ford catalogue they came with gear ratios varying from 3.08 to 3.55

[FoxChassis]

A 3.08:1 gearset in a CV 'Police Interceptor' (which is the P71 package)? A 3.08:1 gearset sounds more like a base, LX, or LX Sport model (all without P71).

Anywhoo, I've NEVER heard of a 3.42:1 gearset.

[Nick88lx]

Sorry guys , i was wrong , i was just talking to our parts guy and he made a mistake when he told me the gear ratio .. i gave him the part number off the pinion and he typed in the wrong number , turns out Jarrett was right , that ratio came in the 7.5 axle , just shows me to trust parts guys lol anyways just so you know the actual ratio is a 3.55 sorry guys ...ill take the blame for this one

[FoxChassis]

3.45:1 maybe (and that'd be for a 7.5" only) but not 3.42:1.

[Mustang4.6]

3.42 are in chevy's.

[black87gtconv]

So you need a 20 teeth speedo gear which I think are black!!