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Old 05-19-2007, 05:25 PM   #1
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Question cams and valve train.

I was just thinking does anybody make aftermarket cams for the 4.0? I think crane cams does. Would a performance cam be worth it in a 4.0? Has anybody tried a aftermarket cam? Also does the 4.0 have hydraulic or solid lifters.

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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-19-2007, 08:11 PM   #2
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If yoru going to go that far, you should just get one of those 4.7 stoker kits Or even a v8 conversion...

or or or...

Yes a 4.7 stroker conversion should do just fine

Edit: The 4.0 has solid lifters as far as I know. Very old, reliable design.

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Old 05-19-2007, 08:32 PM   #3
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I don'y really want one I was just wondering if there are any. I would love to stroke it but it's alot of$$$$$$.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-19-2007, 08:46 PM   #4
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yep for a stroker.. rather get a v8..
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Old 05-20-2007, 08:17 AM   #5
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I do not know of any mass produced vehicle made today that uses solid lifters, they require regular maintainence/adjusting and that is not listed in the manual. Maybe you are wondering if they are roller lifters or not. that I cannot help you with.
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Old 05-20-2007, 09:52 AM   #6
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I thought the 4.0s had solid lifters? I was under the impression we had to use regular dino oil because we had solid lifters, not hydraulic, and oils without certain minerals caused the lifters to wear the cams flat quick fast and in a hurry?

I havent tore one down so I dont know for sure, but thats what I have been told.
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Old 05-20-2007, 10:49 AM   #7
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Solid lifters are a solid piece of metal and you can adjust the gap between the rocker and pushrod , hydraulic lifters use oil pressure internally to maintain the proper gap, both types use regular motor oil not hydraulic oil, hydraulic oil is used in pumps like a floor jack, I hope this clears things up for you.
here is a very good writeup better than I can explain,
http://www.speeddemonmotorsports.com...onversion.html
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Old 05-20-2007, 11:24 AM   #8
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Upon further research I have found that the camshaft is of the hydraulic flat tappet design with the lifters being the same as the amc 360, in my experiance with drag racing mopar v-8s, a new camshaft is an good way to increase horse power
But there is a trade off, more horse power is gained at higher rpms with a corresponding loss of torque down low where a Jeep usually needs it. You maybe able to find a cam designed for towing which will boost torque. A call to the manufacturers describing your vehicle ie: gears, tranny, intended use, will allow them to set you up with the proper cam.
I have had good experience with mopar performance cams, your choice of cams may also hinge on if they are street legal.
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Old 05-20-2007, 02:45 PM   #9
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Ya it might be worth the 200+ bucks to get one for more power in the lowend.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-24-2007, 02:37 AM   #10
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Seems someone here has been doing his homework.. Anyway, I think it is not bad to have an aftermarket crane cams... Had installed that kind of crane cams in my Jeep and it was not bad at all... And I think you had a misconception about hydraulics from solid lifters... There could be a hydraulic for a 4.0 but I never heard of a solid lifters on a 4.0... Goodluck!!!

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