v8 cruise rpm, whats tooo much? - JeepForum.com
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post #1 of 6 Old 12-03-2009, 06:38 PM Thread Starter
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1980 CJ7 
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v8 cruise rpm, whats tooo much?

the deal is possible sb chev swap. problem 4.10 gears, 31" tires 4spd. this puts 55mph at about 2700rpm. 55 is probably as fast as it will b used for any distance, but 2700 seems alot. whatda ya think?

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post #2 of 6 Old 12-03-2009, 07:30 PM
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1984 CJ7 
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2700rpm seams a little high to me especially when my 02 Ford F150 cruises @ 70mph while only doing 2000rpm and the tires are right around 32" diameter w/3.55 gears.

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post #3 of 6 Old 12-03-2009, 07:56 PM
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1958 CJ5 
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As long as it's a good motor and you don't care about fuel consumption, have no fear. I run mine with 5.38 gears on 33 inch tires. Around 3000rpm at 55mph according to GPS. I've driven it to cruisin' the coast twice, 240 miles round trip. Only problem was stopping every 80 miles to fill up.I drove my 70 Ford 302 at 70mph (also 3000rpm) to North Carolina (800+ one way) with no problems.

1958 Willys CJ5 on a 71 Jeep CJ5 chassis, 231 Buick, Dana 30 front, Dana 44 rear, lockers, 5.38 on 33" tires.
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post #4 of 6 Old 12-03-2009, 08:29 PM
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Should be no problem. They seem to take 3200 just fine for cruising so I would not be too concerned.
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post #5 of 6 Old 12-03-2009, 08:40 PM
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I assume the 4spd is the SM465? You could always add something like this to get an OD...

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post #6 of 6 Old 12-03-2009, 10:02 PM
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1982 CJ7 
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If your using a non OD trans its gonna be a 1 to 1 ratio. Consider many 3/4 to 1 ton pickups came with 4.10 gears and pretty close to 31`s putting them where your at. Our 84 haywagon has 155K on the original everything with this setup.
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