Engine Swap

[HoltzKJ]

Where can I find a v8 engine suitable for a swap into a 2004 kj?

 

[tommudd]

How much time and more importantly money do you have available?

 

[HoosierJeeper]

Pretty much any V8 will work, just go the junkyard and see what they have. It's a pretty easy swap. The older the engine the better. It'll be a weekend project.







I crack myself up

 

[tommudd]

Pretty much any V8 will work, just go the junkyard and see what they have. It's a pretty easy swap. The older the engine the better. It'll be a weekend project.







I crack myself up

I know a guy who told his wife he was dropping a older SBF in his, would take less than 30 days.................:icon_lol:

 

[04Liberty]

How much time and more importantly money do you have available?

Definitely this, so far we're what, kinda 0 for 3 (did that one down in South America actually get running on the road?)

Pretty much any V8 will work, just go the junkyard and see what they have. It's a pretty easy swap. The older the engine the better. It'll be a weekend project.







I crack myself up

Ha!

I know a guy who told his wife he was dropping a older SBF in his, would take less than 30 days.................:icon_lol:

And I have a bridge I want to sell you...

 

[CalcityRenegade]

Put a 6.2L Vortec in her!

 

[CactusJacked]

Definitely this, so far we're what, kinda 0 for 3 (did that one down in South America actually get running on the road?)

Yes it did, a 4.7 swap with video proof. I believe he hinted that he wouldn't do it again, the small performance difference he experienced wasn't worth the effort. Should have instead put in a big block Chevy with a blower! :happy175:

 

[CalcityRenegade]

Yes it did, a 4.7 swap with video proof. I believe he hinted that he wouldn't do it again, the small performance difference he experienced wasn't worth the effort. Should have instead put in a big block Chevy with a blower! :happy175:

Do you know what year 4.7 he used? If he has used a 4.7 H.O or 2008+ 4.7 he should have a good 100 more HP & TQ over the 3.7 given the engine was in perfect order. I also do guess for the amount of work he completed 100 HP & TQ would not be worth it though.

 

[tommudd]

Do you know what year 4.7 he used? If he has used a 4.7 H.O or 2008+ 4.7 he should have a good 100 more HP & TQ over the 3.7 given the engine was in perfect order. I also do guess for the amount of work he completed 100 HP & TQ would not be worth it though.

He used the 4.7 H.O. but wasn't worth the effort, time or money in the end really
and he used a brand new , well new rebuilt engine shipped from the states

 

[Hockeygoon]

Do you know what year 4.7 he used? If he has used a 4.7 H.O or 2008+ 4.7 he should have a good 100 more HP & TQ over the 3.7 given the engine was in perfect order. I also do guess for the amount of work he completed 100 HP & TQ would not be worth it though.

So it had about the same power as other good V6s?

 

[CalcityRenegade]

So it had about the same power as other good V6s?

Pretty much. Probably the best power gain a KJ is going to get though.

 

[CactusJacked]

So it had about the same power as other good V6s?

If he used the 03-07 vintage, 235 hp @ 4,500, then yeah. Compare it to the 3.7's 210 hp @ 5200. The max hp rpm difference makes for an apples to oranges hp comparison though. The 4.7 also has 65 lb-ft more torque (a 28% increase over the 3.7), which you should certainly feel that difference off the line. Still a lot of work for those gains.
EDIT: he (Honduras) used a 2004 Grand Cherokee 4.7 HO. 265 hp., 325 torque. Maybe he didn't have it tuned right, that engine should have made a noticeable difference.

 

[HoosierJeeper]

I thought he decided it was too much power for the KJ and so many other things went wrong from having that much power that he decided it would just be more enjoyable to have the V6, since with the V8 if you used all the power stuff went wrong.

 

[HoltzKJ]

The engine possibilities seem endless, but what else would need to be swapped out to compensate for the power gains and not be tearing up the whole drivetrain of the KJ?

 

[tjkj2002]

The engine possibilities seem endless, but what else would need to be swapped out to compensate for the power gains and not be tearing up the whole drivetrain of the KJ?

Trans,t-case(that matches trans),and front diff.pretty much the entire drivetrain has to go and be replaced with much more robust components.The rear 8.25 will handle a stock V8(under 400lbs-ft of torque) without to much trouble but still not advisable to keep it if your close to that 400lbs-ft mark.

My KJ is SFA'd,35" tires,D60 rear and HP44 front,and Atlas t-case which all said and done weighs well north of 6200lbs and the stock 3.7 V6 does just fine here in Colorado at 6200'+.I'm not going to win a drag races but it's not that much worse then a KJ with 265/75R16's with stock gearing.