1978 Jeep J-10 stock gear ratios - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-10-2003, 03:29 PM
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1978 Jeep J-10 stock gear ratios

I have a stock 78 J-10 (non honcho, 119" wheelbase, 360 V-8) and was wondering what the gear ratios in the diff. are. Is it 3.54? Also how does one compute the overall crawl ratio? I have a T-18A with a 6.02:1 1st gear (I think thats it), Dana 20 (dont know the gearing on that, though 3:1 seems to pop up in my head). Do you multiply those numbers? if so that makes a 64:1 crawl ratio, does that sound right?
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post #2 of (permalink) Old 06-11-2003, 01:57 PM
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Re: 1978 Jeep J-10 stock gear ratios

I think '77 & '78 were similar model years. '77 factory manual says 3.54 gears were standard and 4.09 were optional. Tha Dana 20 is a 2.03 ratio, the T 18 1st is 6.32. Overall that would give you @ 45:1 for a crawl ratio. TearLow makes a 3:15 gearset for the Dana 20.

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