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If the ratios are different, the answer could be to find a new centersection for the front axle. I have yet to find one that was worn out - being that they are a part time setup and most of them sit still a lot. I can set up a ring gear, but I avoid it if it's not absolutely necessary. Some ratios are more common than others on the used market, what ratio is the rear end in your truck?
Being a specialized mechanic, such as engine, tires, paint, body, etc., will not provide the experience needed to install a ring & pinion set COLD.
The most important factors are: pinion bearing pre-load, ring gear pre-load, accurate location of the gears with respect to one another, which establishes the TOOTH CONTACT PATTERN, and backlash, or clearance, between the gear teeth.
Incorrectly set-up hypoid gearing can create noise, gear tooth scoring, excess heat, and/or total gear failure.
Being a specialized mechanic, such as engine, tires, paint, body, etc., will not provide the experience needed to install a ring & pinion set COLD.
The most important factors are: pinion bearing pre-load, ring gear pre-load, accurate location of the gears with respect to one another, which establishes the TOOTH CONTACT PATTERN, and backlash, or clearance, between the gear teeth.
Incorrectly set-up hypoid gearing can create noise, gear tooth scoring, excess heat, and/or total gear failure.
impish
That's why I asked if he was maintenance or overhaul, Turbine engines have a gear box built into them for the accessories, Turboshaft engines (such as the ones that the helicopters he works on most likely have) actually have a very sturdy gearbox to transmit power from the turbine (generally a "free" power turbine) to the gearbox which is basically a PTO for the anti torque rotor.
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