Re: 1965 c10 ratio gears...swap..fitting help!!!
You can install any gears you want into your 12 bolt housing. You just need the correct series carrier. This would be the perfect time to up0grade to a posi. However if you do not have experience with setting up differential gears, that is best left to a professional.
The easier option would to to find a '65-'70 truck 12 bolt with the gears you want already in it. If you go with a 3.07 gear, you may have to start using 1st gear on take off from a stop.
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