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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | It is not the pinion gear that would keep you from putting a car 3.55 in a truck torque tube.
It is true they have the same splines for the drive shaft and use the same pinion bearings.
The problem comes in with the ring gear, it will not bolt up to the truck ring gear differential case.
If you tried to use a car differential case the side bearings would be incorrect and the spider gears would be to small for the truck axles.
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