whos got the run down for 2005-2010 v6 and v8 engines? - JeepForum.com
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post #1 of 17 Old 01-20-2020, 08:11 PM Thread Starter
02grandy
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whos got the run down for 2005-2010 v6 and v8 engines?

Does anyone have info on the engines and even drivetrains over these years and what to look for and what to stay away from? Also mileage risk factors for the different engines and things to look for when buying used. thanks

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post #2 of 17 Old 01-21-2020, 07:15 AM
jeeptorino68
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For engines:
wkjeeps.com

Buying guide, scroll up and look for the sticky
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Kyle
92 XJ 4.0 HO,AW4, NP242, 30" BFG AT, 1.75 spacer and ZJ coils, double cherokee leaf pack and 2 inch rough country shackles, 2.5 inch dnynomax exhaust, magnaflow cat, front hooks & rear hitch, gas skid, front skid, warn t-case skid, 99+ intake, bored TB

02 KJ Limited, 255 70 16s, front skid, LS/373 gears
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post #3 of 17 Old 01-21-2020, 09:25 AM
90grandoneer
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As far as which engine, that is buyer's preference. Personally, I'd have nothing but Hemi's....currently 3 of them. They both have their pros and cons though.

06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, AFE Air Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS and HP tuners, Transgo Shift Kit, ARH Long Tube Hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam w/6* advance/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, TEA ported/milled heads w/new valve seats, SRT Reps with 265/45&295/40X20's. Also 05 Hemi LX modded exactly like WK and Comp Cammed 06 300CSRT8.
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post #4 of 17 Old 01-21-2020, 11:56 AM
Capital AL
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My only complaint with the V6 engine is fuel economy. That is why I chose the V6 over the hemi V8. I average around 15 MPG for mixed city and highway driving, if I knew it would have been so low I would have got the hemi.
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post #5 of 17 Old 01-21-2020, 03:21 PM
stangyog
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Same hear... '07 with 3.7l. Mostly highway and only get around 15.8-16.2.
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post #6 of 17 Old 01-21-2020, 05:52 PM
Rtbrjason
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They all get similar mpg not including the diesel or srt models.

https://www.fueleconomy.gov/feg/bymo...Cherokee.shtml

The difference in power is significant though, as per the attached pic. I see no reason to get the 3.7 ever. Negligible mpg, serious reduction in power, and you lose the 2 speed transfer case.
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post #7 of 17 Old 01-21-2020, 08:50 PM
90grandoneer
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Quote:
Originally Posted by Capital AL View Post
My only complaint with the V6 engine is fuel economy. That is why I chose the V6 over the hemi V8. I average around 15 MPG for mixed city and highway driving, if I knew it would have been so low I would have got the hemi.
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Originally Posted by stangyog View Post
Same hear... '07 with 3.7l. Mostly highway and only get around 15.8-16.2.
Most folks with well maintained Hemi's usually get between 16-19 mpg on the highway and 12-14 mpg around town. With the mods to my Hemi (see signature), driving at 63-68 mph in 4th gear, I usually get 20-23 mpg on the highway and still 12-14 in town with a lot of lead footing.

06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, AFE Air Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS and HP tuners, Transgo Shift Kit, ARH Long Tube Hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam w/6* advance/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, TEA ported/milled heads w/new valve seats, SRT Reps with 265/45&295/40X20's. Also 05 Hemi LX modded exactly like WK and Comp Cammed 06 300CSRT8.
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post #8 of 17 Old 01-22-2020, 05:27 PM
LouC
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getting a WK...HEMI...the only choice!

2017 JK Unlimited Sport 6 spd
2007 WK Limited Hemi QDII
1998 ZJ Laredo 4.0 Selectrac
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post #9 of 17 Old 01-22-2020, 10:38 PM
Bangarng
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2010 HEMI here, and it's 200 smiles for 200 miles. Corny, but you get it.


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post #10 of 17 Old 01-22-2020, 11:58 PM
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We average 13-14around town in our 6.1. @85, it gets 17-18. Either Hemi is the way to go, IMO. There is a reason the 3.7 was short-lived.

19 Sting-Gray WK2 Trailhawk | Hemi | MRR | Ridge Grapplers
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post #11 of 17 Old 01-23-2020, 05:59 AM
Avs
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5.7 hemi much more power and youíre almost burning around the same amount of fuel as a 3.7 and 4.7.
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post #12 of 17 Old 01-23-2020, 08:03 AM Thread Starter
02grandy
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so a 2009-2010 hemi set up 2008 had the old engine?

or possibly a 2008-2010 4.7 set up (with the improved engine) ?
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post #13 of 17 Old 01-23-2020, 08:10 AM
Avs
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Quote:
Originally Posted by 02grandy View Post
so a 2009-2010 hemi set up 2008 had the old engine?



or possibly a 2008-2010 4.7 set up (with the improved engine) ?


05-07
08-10 improved hemi
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post #14 of 17 Old 01-23-2020, 08:23 AM Thread Starter
02grandy
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I think WKjeeps.com said the newer 5.7 came out in 2009 ? If there anything that isn noticeable about the old and new if I'm looking 2008?
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post #15 of 17 Old 01-23-2020, 11:17 AM
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Quote:
Originally Posted by 02grandy View Post
so a 2009-2010 hemi set up 2008 had the old engine?

or possibly a 2008-2010 4.7 set up (with the improved engine) ?
Yes all 2005-2008 hemis are almost the same but the power levels are identical.
2005 and 2006 hemis have some programming changes to the engine and transmissions as they evolved (but nothing major ) and the 2007-2008 hemis should be pretty much the same.

2009-2010 hemi is the VVT engine. in 2010 you could actually get a base model Laredo with a hemi.

In 2008 the 4.7 changed and got a big boost in power. I think itís a better engine then the old version. Old 4.7 doesnít have the longevity of any of the hemis. I think the newer 2008+ ones are closer . Donít overheat either of them though!

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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