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Unread 03-04-2013, 02:09 PM   #1
Newbjeep
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1972 CJ5 
 
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Red line

So I got to thinkin and I don't know what my red line is and I buying a tach so I was hoping some would know what the stock red line was on and amc 304 from my 72 cj5

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Unread 03-04-2013, 02:13 PM   #2
82JeepCJ7
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Howdy.. live just down the road from ya.

I typically don't go over 4k with my 304.
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Unread 03-04-2013, 02:16 PM   #3
Newbjeep
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Do you know what the stick red line was and why so low
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Unread 03-04-2013, 02:21 PM   #4
82JeepCJ7
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304s are not made to rev real high. They make most of their torque in the lower RPM ranges unless you have swapped in a cam that likes 5,000RPM. Once you start getting up in the RPMs, the valve train is not designed for those high revs. The valves start floating first, and then you can see valve failure which can lead to the piston smacking a valve the the S hits the fan real quick.

What trans, axle gears, tires are you running?
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Unread 03-04-2013, 02:35 PM   #5
stroked383z28
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The stock tach on my 76 304 is shaded from 5k to 6k. The camshaft profile primarily determines what rpm the engine will make peak power. Larger duration will move the power band up. Low end torque, not high rpm power, is typically desired in an off road vehicle.
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Unread 03-04-2013, 02:38 PM   #6
Newbjeep
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It's a 3 speed with Dana 20 and I have no idea I'd guess stock but idk I bought it a few weeks about has a locker in the back
image.jpg  
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Unread 03-04-2013, 02:47 PM   #7
82JeepCJ7
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Yea, with that setup, your motor will be happy at 4k and under.
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Unread 03-04-2013, 07:27 PM   #8
Newbjeep
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My buddy just bought a 56 Willys cj5 and it has the warn overdrive sticker in the glove box and I was wondering where the lever would be
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Unread 03-04-2013, 08:27 PM   #9
82JeepCJ7
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With a model 20 T-case, you won't have an overdrive. Those are only used on model 18 transfercases.
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Unread 03-04-2013, 08:30 PM   #10
Newbjeep
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I read that it does have a 18 is there some thing I an get pics of to show you to know
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Unread 03-04-2013, 08:41 PM   #11
BuckleshootCJ5
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My 304 seems to want to explode if I get much over 4,000 RPM's. I set the redline on my tach at 4,000 and usually don't get much over 3,700...
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Unread 03-04-2013, 08:41 PM   #12
davbytrace
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4k is redline on mine.
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Unread 03-04-2013, 09:12 PM   #13
82JeepCJ7
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I'll have to come up and have a look at it.
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Unread 03-05-2013, 07:48 AM   #14
Newbjeep
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That'd be ok with me maybe this weekend my buddy works till like six every day and he drives it to work
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Unread 03-05-2013, 07:52 AM   #15
CSP
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Quote:
Originally Posted by Newbjeep View Post
I read that it does have a 18 is there some thing I an get pics of to show you to know
Are you talking about yours or your buddie's? Kinda hard to follow who you're talking about.

Have you looked anywhere else on the internet for this information? Google Dana 18 Warn overdrive. You can find all kinds of pictures.
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