4.7 V8 / 545RFE swap

**Wheelin98TJ** · 02-16-2009, 08:54 AM

Got started this weekend on my 4.7 V8 swap from a WJ.

Not much done yet, but this thread will be updated as it progresses.

Me and a friend worked for 2 1/2 hours on Sat and were able to make some good progress.

**Unlimited04** · 02-16-2009, 08:56 AM

well theres your problem!

im interested to see how this 545RFE works...its pretty long.

**Wheelin98TJ** · 02-16-2009, 08:58 AM

Quote:

Originally Posted by Unlimited04

well theres your problem!

Maybe my thread title should be "My TJ will not crank over. What is wrong?".

**chadsmeltzer** · 05-03-2009, 03:42 PM

any updates?
I just got a call about a 4.7 with trans and tcase for $500. Engine needs some work but I am thinking about it...

**Jerry Bransford** · 05-03-2009, 03:54 PM

That's awesome. If you can get it running, which I expect you will, you'll dig that 4.7L. We're on our second JGC with the 4.7 and it's really a sweet running engine. I'd love to have it in my TJ, that is for sure.

**rubidriver** · 05-03-2009, 04:25 PM

With that long of a tranny, I envision vibes that are very hard to get rid of. Do we have a plan yet for that?

**Jerry Bransford** · 05-03-2009, 04:31 PM

Quote:

Originally Posted by rubidriver

With that long of a tranny, I envision vibes that are very hard to get rid of. Do we have a plan yet for that?

A V8 block is significantly shorter than an I6 block so that will help.

**rubidriver** · 05-03-2009, 04:34 PM

Quote:

Originally Posted by Jerry Bransford

A V8 block is significantly shorter than an I6 block so that will help.

Didnt think of that. Will the output shaft be where it would be stock? Or farther forward or backward?

LJameson · 05-03-2009, 05:27 PM

Is it a HO 4.7 or the regular?

IMHO, this engine is the best swap candidate for a TJ as far as V8's go. They're silky smooth, lots of grunt for it's relativly small size and very reliable.

**rubidriver** · 05-03-2009, 05:38 PM

Quote:

Originally Posted by jeepfreak4life7

Is it a HO 4.7 or the regular?

IMHO, this engine is the best swap candidate for a TJ as far as V8's go. They're silky smooth, lots of grunt for it's relativly small size and very reliable.

I guess if your talking about a budget swap, but if price doesnt matter Hemi takes gold.

**chadsmeltzer** · 05-03-2009, 10:48 PM

Quote:

Originally Posted by Jerry Bransford

That's awesome. If you can get it running, which I expect you will, you'll dig that 4.7L. We're on our second JGC with the 4.7 and it's really a sweet running engine. I'd love to have it in my TJ, that is for sure.

I guess it has low compression in one cylinder, I talked to the owners friend about it so I don't know everything yet.
At the school I go to, I have to rebuild an engine in class. This seems like a good opportunity to do it. I know I would love a little more HP on the dunes.

My friend (I am sure he will post in here soon) has a WJ with the 4.7 HO and it is a great engine, plenty of power.

**Arcticcat843** · 05-03-2009, 10:59 PM

Quote:

Originally Posted by chadsmeltzer

My friend (I am sure he will post in here soon) has a WJ with the 4.7 HO and it is a great engine, plenty of power.

We deff need updates.....Ive been trying to convince him todo this all day. I really want to help with it. Ive never done a engine swap before.

We are pretty sure its just a bad valve....Worse case its got a hole in a piston so a new set of pistons, bore it out and new rings...Whats that? 4-500 bucks? still not to bad. Plus if it has a select trac attached to it he could sell it for almost that. I bet we could get it for closer to 300. oh and its out of a 2000 so its deff not a HO. But still, they make like 265 horse (or somewhere around there) Only difference between the ho and non is the intake and cams.

Anyways, what are you doing about the little stuff, like guages? fuel pump? could you set up the mount to still run the same drive shafts? Stock shifter hook up? Its looking like the hardest part is going to be wiring....I really dont think it will be that bad. I think we can figure it out, and if we cant im sure we can find friends that can.

Let us know how it goes

**Wheelin98TJ** · 05-04-2009, 08:32 AM

Oh brother, now I have to admit how long I've been draggin my feet on this. I was just going to delete this thread and start a new one when I made some more progress.

I just ordered a few parts this week so I can get back in to this project.

Quote:

Originally Posted by rubidriver

Didnt think of that. Will the output shaft be where it would be stock? Or farther forward or backward?

Its going to end up pretty close to where it was previously with the I6 and 32rh.

Like Jerry said, the V8 block being shorter (about 5" shorter) makes up for the 6" longer 545RFE tranny.

Quote:

Originally Posted by jeepfreak4life7

Is it a HO 4.7 or the regular?

IMHO, this engine is the best swap candidate for a TJ as far as V8's go. They're silky smooth, lots of grunt for it's relativly small size and very reliable.

Its the regular 4.7.

**Wheelin98TJ** · 05-04-2009, 08:44 AM

Quote:

Originally Posted by Arcticcat843

Anyways, what are you doing about the little stuff, like guages? fuel pump? could you set up the mount to still run the same drive shafts? Stock shifter hook up? Its looking like the hardest part is going to be wiring....I really dont think it will be that bad. I think we can figure it out, and if we cant im sure we can find friends that can.

Let us know how it goes

I'm using the stock WJ gauges. I'll have to modify the TJ dash so they can fit, but I think I'll be able to use all the TJ trim so it should look real clean when its done.

Fuel pump will be the stock TJ unit. WJs run on the same fuel pressure as TJs do. (49.2 +/- 5 PSI)

I suppose I could set it up to use the same driveshafts, but I'm not taking that route. The motor will be placed in the optimum position and the driveshafts will be considered last when the Jeep is back on the ground with the weight on the springs.

The shifter I'm using is the stock TJ shifter.

I too think that wiring will be the most difficult part of the job.

**Arcticcat843** · 05-04-2009, 09:10 AM

Are you making motor mounts?
Isnt the Wj cluster quite a bit bigger than the tj one?

Well you said with the length differences that they are about the same length so it doesn't sound like you are going to have a ton of room to move it around. Chad deff doesn't want to have to buy new driveshafts.

How does the Wj trans compare to a 42rle in size, like around, chad has a tummy tuck skid, think it would fit without to much modification?

I take it you are using the wj computer and most of the harness from that? What other stuff do we need from the wj? We arent going to get a full vehicle so i guess we need to knoew what other little crap we are going to be missing later....Do you have a full jeep or did you just buy the engine?