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  #13  
Old 10-20-2010, 12:49 PM
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Re: 4.0 vs.4.7

Like said earlier...with proper maintenance...both are excellent runners.

I had 2 4.0L's and now a 4.7L HO.

As for fuel economy...the 4.7L HO gets me about 17 average in city/suburb driving. 4.0L got 15, period...highway, city, didn't matter.

Lots more power, and better gas mileage? I like my HO....
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  #14  
Old 10-20-2010, 06:25 PM
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Re: 4.0 vs.4.7

What rear gears are in the average 4.0?

Could that be a difference

i'm thinking about getting 2wd grand cherokee so a change to highway gears wouldn't bother me as there is no interest to go off road.

Could the 4.7 have different gears ?
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  #15  
Old 10-20-2010, 06:30 PM
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Re: 4.0 vs.4.7

3:55 on stock Cherokee automatic, 3:07 manual

3:73 wrangler automatic, 3:07 manual, 4:10 rubicon

3:73 grand cherokee

Some 2wd cherokees and grand cherokees had 4:10s

The WK 4.7 has 3:73s
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  #16  
Old 10-22-2010, 05:42 PM
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Re: 4.0 vs.4.7

i wonder why in 2wd they would put 4:10's
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  #17  
Old 10-22-2010, 08:52 PM
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Re: 4.0 vs.4.7

Quote:
Originally Posted by NHWK05 View Post
3:55 on stock Cherokee automatic, 3:07 manual

3:73 wrangler automatic, 3:07 manual, 4:10 rubicon

3:73 grand cherokee

Some 2wd cherokees and grand cherokees had 4:10s

The WK 4.7 has 3:73s
I believe some automatic 4.0L Grand Cherokee's had 3.55s.
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  #18  
Old 10-23-2010, 07:13 PM
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Re: 4.0 vs.4.7

Love my 4.7/545rfe tranny combo. Just plain out fun to drive. I find myself shooting out of stop signs and lights just to feel the acceleration and sound. My 5.2's just never had that kind of power.

I've never had a 4.0.
I've got a couple of 4.0's that I'm in the process of building and can't wait to join that club. If anything I just want the reliability for my wife's daily driver.
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  #19  
Old 10-25-2010, 03:44 PM
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Re: 4.0 vs.4.7

Quote:
Originally Posted by Gn300 View Post
i wonder why in 2wd they would put 4:10's
I believe it was to give them a better advantage and torque because they were 2wd so obviously they dont have a low range either.

Quote:
Originally Posted by JeepMe View Post
I believe some automatic 4.0L Grand Cherokee's had 3.55s.

Yes, i think you are right i forgot about that. There are also a handful of 93/95 ZJs with the 4.0 and a 5 speed manual and 3:07 gears.
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  #20  
Old 11-08-2010, 09:55 PM
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Re: 4.0 vs.4.7

i had a 89 cherokee 4.0 and have a 99 WJ 4.7, love both, the WJ gets better gas mileage, seems to have only a barely noticeable increase in power, but is definitely not quite as responsive throttle or transmission wise. The 89 was unkillable. Had to put in a manual clutch fan at about 180K, and was even in a situation where it was ran out of tranny fluid, till it wouldn't drive any more, patched the hole, filled it up and it was like nothing was ever wrong. I'm even thinking of buying my neighbor's (only has 80k) for 2000 because it was such a killer truck... sigh* i miss that truck... as much as I love my WJ
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  #21  
Old 11-08-2010, 10:20 PM
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Re: 4.0 vs.4.7

I put 195K miles on my 4.0L ZJ when I sold it. Never had a problem with the engine at all.
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  #22  
Old 11-09-2010, 04:01 PM
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Re: 4.0 vs.4.7

Ive had 2 cherokees,1 wrangler,and now my WJ and all have had the 4.0,i just love this motor,yeah it's down on hp compared to 4.7 it's a straight six and you are comparing it to v-8 but for me that's not what's it about for me,these motors RUN forever.I would have liked to try the 4.7HO (no subsitute for v-8 sound) but i wanted select trac 4wd and those are hard to find (at least around here) so i got 4.0 with select trac (2wd,part time 4wd) witch are a lot easier to find
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  #23  
Old 11-10-2010, 08:27 PM
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Re: 4.0 vs.4.7

Here is my thing. I never had the 4.7. But i do have the 4.0 I6 and i am rather upset about it. I bought the jeep with 60,000 on it. It cost me 14,000 after tax title and all that crap.
After 123,000 miles, my #1 cy. exhaust lifter collapsed. following that it then actually worn the #1 lobe on the cam almost to a perfect circle. The valve would not open since the lifter had died. $1900.00 later, my water pump went! $300.00 later I just found out that my right brake light bulb holder has melted. So now i have to purchase a new plug for that tail light.
But with all this, I love my jeep. call me foolish but its a damn sexy ride. o yea, its a 04 Laredo.
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