Re: differential gearing
Keep this in mind. Bigger tires effectively need more gear to get rolling. One thing some forget is the bigger tires have an effect like an overdrive gear. Effectively for each revolution of the tires, you are going further than you would with a smaller tire. So if you already have 4.10's already you will be ok with either 33's or 35's. 4.56's with the 35's is the sweet spot if you got them.
Still, like Obijuan said, pull the cover and read the numbers on the ring gear. You'll know for sure. I've found the 4.10 ratio is more common on the K20 vs the 4.56 gear, 3.73's are probably the most common.
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Rob Z.
1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP
1991 K5 8.1L/NV4500/241/D44/14b FWC Camper
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