Inline 6 258
I currently have a 1978 cj5 with an inline 6 with a T-18A 4sp and was wondering what the best gear ratio for the front and rear diff would be.
What size tires... what are you going to do with the Jeep? Rock crawling? Daily commuter car that never sees mud? It all makes a difference. If you want the daily driver fuel economy, I'd go with like a 3.07 or something... but if you're putting big mudders on it with plans to only run it on the weekends, go with something way more aggressive like 4.11 or 4.56.
I have 32x11.50x15 size tires. My other cj5 has the same size tires but it has 4.27 gears and a 304 v8. Currently the 1978 cj5 has 3.54 gears and seems a little high geared. I use the jeeps for hunting which finds on steep slopes and muddy roads. I do not do much rock crawlin. My 1974 cj5 has a crawl ratio of 53.9 in low 1st gear. and the 1978 has a crawl ratio of 44.7. Both have 32X11.5X15 tires. I was considering putting in a terra low gear set in the model 20 tc. and that would give me about 70 to 1 in crawl. what do you think.
I found this handy chart, I think it will answer your question. It gives you the formula for calculating RPM's for any speed based on tire size and gear ratios.
It's not so much a labor of love as it is shear determination.
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