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Unread 09-02-2012, 11:07 PM   #31
Mike78cj7
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Sounds like you need to confirm gear ratio. 3,300 to 3,400 at 62-64 MPH is really high RPM's if you say you have 33" tires and 4.56 gears

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Unread 09-10-2012, 07:29 PM   #32
tevans59
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I dont have much to offer but I disagree with the one that said 4.56 was not a low gear, but in my day 4.56 and 4.88 were racing gears and I would not want my jeep to be screaming thru the gears, mine is loud enough as it is , that would be like driving in 3rd all the time. good luck man
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Unread 09-10-2012, 08:09 PM   #33
OldTexas
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Just an off thought, have you replaced the coolant with a 50/50 mixture of water and ethelyne glycol (anti-freeze)? If it's straight water, 100% coolant, or old coolant, those will reduce your cooling capacity.

May want to take a good look at your fan clutch too. It needs to be between free enough to idle at highway speeds so as not to create an air dam and tight enough to pull air at lower speeds and when idling. When you say "heavy duty fan clutch" that concerns me a little bit.

Is there any indication the PO had pulled the heads for a vlave job? It may sound silly but I've seen reversed head gaskets block water jackets.

If you haven't already, a really really good cooling system flush might be a good idea. It can be amazing what some people can put in their radiators sometimes.

Finally, check the pressure on the radiator cap and be sure it is correct for your 360. Too high a pressure cap will not permit the heated coolant to expand into the overflow and coolant, the higher the pressure, becomes less and lkess effective at dissipating heat.
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Unread 09-10-2012, 08:45 PM   #34
mike_breaker_5
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Quote:
Originally Posted by OldTexas View Post

If you haven't already, a really really good cooling system flush might be a good idea. It can be amazing what some people can put in their radiators sometimes.
this is no joke. i had an hour long argument with a co-worker about putting salt in the radiator in the winter time. no crap, this guy was having similar problems with his 4.0 2door Cherokee. he said it was overheating very easily. since i'm known as the jeep guy at the plant he came to me.

i asked him similar questions as all of you. then he told me he uses salt in the winter to keep the water from freezing. after i picked my jaw up off the floor i told him to flush the coolant system immediately. he reported back that it didn't work, then proceed to show me a picture of the coolant ports under the head in a pic on his phone the next day. there was a little bit of cylinder head left in his chunk of rust.
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Unread 09-11-2012, 10:55 AM   #35
turbogus
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Semper Fi, Old Texas. I like your Ronald Reagan quote.
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Unread 09-11-2012, 06:57 PM   #36
OldTexas
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Originally Posted by turbogus View Post
Semper Fi, Old Texas. I like your Ronald Reagan quote.
Semper Fi...

Down here a lotta folks will put pepper in their radiators as a temporary way to stop a leak.
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