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Old 11-06-2013, 05:05 PM   #1
ReedandhisTJ's Avatar
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Location: Schertz, Texas
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questions on a 4.7 swap

So i'm pretty sure i get the jist of how everything works if I installed the 4.7l stroker, and although my 4 banger last forever, i'm getting tired of it. But i've hit a mental dilemma over the power output I'll recieve in a stroked 4.0. My first question is, can I swap all my engine parts from a 4.0 XJ or tj? (radiator is part of my focus) or can I keep all those under the hood goodies where they're currently with the exception of motor mounts and brackets.

2.) would I need to switch transmissions? I feel like that amount of power would destroy my AX-15, I drive in low rpm's (between 2-3thousand)

3.)how would my D35 handle? Would I need to switch to a D44 or Ford 8.8?

thaks for reading this everyone, I appreciate it and look forward to the comments on this questionmy amateur-ness thread!

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Old 11-06-2013, 05:06 PM   #2
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*Destroy my AX-15, despite the fact I drive in low rpms

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Old 11-06-2013, 05:52 PM   #3
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4 banger probably had an AX5 which is a real POS while an AX15 is a decent tranny

Rear end longevity without upgrade depends on gears tires lockers and how you use abuse it but an 8.8 or D44 would be significantly stronger
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Old 11-06-2013, 07:32 PM   #4
Knows a couple things...

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I can count the # of successes getting the 4.7L stroker engine running well on a TJ on zero fingers. Problems normally have to do with getting the computer programmed properly for the stroked engine's requirements.

You'd have to replace the OE AX-5 transmissoin with something stronger like the AX-15, which means you'd either also have to swap in a different 231 tcase or swap your 21 spline input shaft for a 23 spline input shaft to match the AX-15.

Then you'd have that D35c rear axle to contend with....

I'm not so sure I'd go at this project without a lot of patience, time, and $$$ in the account.
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

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Old 11-06-2013, 08:37 PM   #5
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Location: Bakersfield
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Read Jerry's post again a few times..he's telling you straight up.

As an example, several years ago, JP Magazine did a stroker swap into an XJ Cherokee (Project JR). Even with the resources of several vendors and lots of $$, it never ran right due to tuning and injector issues. Hazel said in print that he wished that he had left it alone. It eventually died and was swapped out for a stock 4.0 before it was sold.

Now for my .02...and this is coming from a guy that spent a few dollars on my conversion...I wouldn't spent the $$ on the stroker for whats the gains are. The involved headaches just aint worth it. Live with a solid healthy 4.0 or save the $$ and do a V8 if you've just gotta have the HP. Just another opinion....
98 TJ 5.7 Hemi, 545RFE, G2 D44, HP30, 4.10s & ARBs, RE 4.5 LA, 35 in MTRs on 15x10 alloys, Gen Right G3 Aluminum fenders/rear flares, Warn 9.5 CTi w/ Amsteel Blue, Premier Welder, Savvy rockers, Rampage top, a few other goodies..
Link to build thread..
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Old 11-07-2013, 12:28 PM   #6
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Listen to Bransford. He's truly one of the Jeep gurus and a no BS kind of guy. He knows.

Gale Banks has anew turbo kit for the 4.0L. I don't know anything about it other than it exists.
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Old 11-07-2013, 04:47 PM   #7
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Alright thanks for all the comments! yeah i just started to read into them about a week ago and just wanted to ask the forum for cheap insurance before I did anything I'd regret. Well, if not the 4.7, than what v8 would be the best for my tj? (adapters, conversion kits, power, longevity, weight) I always considered either a 302 or a hemi of some sorts but never put in alot of time into engine research. any thing else you guys could teach me?

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