Doing front drive shaft swap - JeepForum.com
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post #1 of 16 Old 09-26-2019, 05:53 PM Thread Starter
gsxr800
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Doing front drive shaft swap

So I got the yoke from iron rock Offroad
And a 2004 limited 4.7 front double cardan drive shaft. But the drive shaft is short. But everything I checked said this was the correct length. What gives?


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post #2 of 16 Old 09-26-2019, 06:12 PM
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Well though they probably are, the picture makes them look like they're not lined up exactly on the left side, but at any rate the yoke is going to be different on the right side (as they're pictured the transfer case side), plus there's some give and take in the slip yoke (under the boot). As far as I know, there was only one WJ front propeller shaft with the double cardan and it looks like you have it. The rear propeller shaft is a different story - there are several variants depending upon the combination of 4x4, 4x2, 4.7L and 4.0L.

So, obtain the correct transfer case yoke and when you go to install I think you'll find that it fits just fine.
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post #3 of 16 Old 09-26-2019, 06:17 PM Thread Starter
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Quote:
Originally Posted by 99wjtx View Post
Well though they probably are, the picture makes them look like they're not lined up exactly on the left side, but at any rate the yoke is going to be different on the right side (as they're pictured the transfer case side), plus there's some give and take in the slip yoke (under the boot). As far as I know, there was only one WJ front propeller shaft with the double cardan and it looks like you have it. The rear propeller shaft is a different story - there are several variants depending upon the combination of 4x4, 4x2, 4.7L and 4.0L.

So, obtain the correct transfer case yoke and when you go to install I think you'll find that it fits just fine.


I have a new yoke. Got it from iron rock Offroad. We were at the point of bolting it in place and itís short.


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post #4 of 16 Old 09-26-2019, 06:22 PM Thread Starter
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Now it will go if I pull on the shaft to make it longer just not sure if thatís normal for this swap


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post #5 of 16 Old 09-26-2019, 06:45 PM
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You needed one from a V8 ZJ. It's slightly longer.

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post #6 of 16 Old 09-26-2019, 08:03 PM Thread Starter
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You needed one from a V8 ZJ. It's slightly longer.

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Ughh. That sucks. I got it in and no vibrations but donít like the fact that itís nearly fully extended. And I donít know what will happen with suspension droop.


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post #7 of 16 Old 09-27-2019, 12:02 AM
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I have that propeller shaft in front of both a 242 and 247 and I didn't encounter any fitment issues. As I recall, one transfer case did require it to be somewhat longer than the other. I don't recall which one but if the stretch would create a problem then I doubt Jeep would have used it.

There have been many swaps and posts about the double cardan swap here over the years. As I mentioned before, from my research I could find only one double cardan shaft assembly that was ever used on WJs and you apparently have it. Otherwise, maybe the one you have didn't actually come from a 2004 Grand Cherokee as marked but I doubt it.

I run stock WJs and have had no problems. Anyway, I agree about the ZJ as I believe I've seen that mentioned in past posts here. If you're concerned then maybe that's the way to go.
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post #8 of 16 Old 09-27-2019, 06:02 AM Thread Starter
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Here is a picture of how stretched the boot is on the driveshaft.


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post #9 of 16 Old 09-27-2019, 06:40 AM
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If you're going off road, that's going to be an issue. Just around town not so much as long as you avoid any large dips and ruts where you'd need some articulation.

I'd look for one from a V8 ZJ or buy a new one (buying a stock one for a ZJ would be cheaper than purchasing one specific to the WJ conversion you are doing). I've seen them in the $150-180 range. Used would be considerably cheaper but I'd do new U-Joints and knuckle. By the time you're done it could be close to the cost of a new one.

It's up to you but I'd be concerned with what you have there.

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post #10 of 16 Old 09-27-2019, 06:52 AM Thread Starter
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Doing front drive shaft swap

Quote:
Originally Posted by 007matman View Post
If you're going off road, that's going to be an issue. Just around town not so much as long as you avoid any large dips and ruts where you'd need some articulation.

I'd look for one from a V8 ZJ or buy a new one (buying a stock one for a ZJ would be cheaper than purchasing one specific to the WJ conversion you are doing). I've seen them in the $150-180 range. Used would be considerably cheaper but I'd do new U-Joints and knuckle. By the time you're done it could be close to the cost of a new one.

It's up to you but I'd be concerned with what you have there.

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Oh itís definitely not staying this way. Iím gonna keep looking for an affordable solution.

I found a list of driveshafts and lengths that someone put together on here from all models but donít know which were double cardan or not.

And the longest one from a ZJ was 33.5Ē from 96/98. But were all from ZJ double Cardan.

I am on 4Ē of springs so I assume the shaft gets longer as axle drops.


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post #11 of 16 Old 09-27-2019, 07:02 AM
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I don't remember which model year mine was off of. It's been several years since I did this. 96-98 sounds right though. I think at that time I paid $75 for the driveshaft and maybe $40-50 in parts. So, it was close to new when I added it up.

You are correct on the axle length change when the axle drops.

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post #12 of 16 Old 09-27-2019, 07:39 AM Thread Starter
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Well I just realized that I brought my front axle forward after going up to 4Ē lift. That slipped my mind.

So thatís the reason for my problem. Now to locate a length I can get away with from another Jeep.


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post #13 of 16 Old 09-27-2019, 07:46 AM
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A 4" lift doesn't move your axle forward 4". The DS is at an angle. If it came straight down from the top that statement would be accurate.

I have a 4" lift, 33's and a ZJ DS and it's perfect.

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post #14 of 16 Old 09-27-2019, 07:49 AM Thread Starter
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Quote:
Originally Posted by 007matman View Post
A 4" lift doesn't move your axle forward 4". The DS is at an angle. If it came straight down from the top that statement would be accurate.

I have a 4" lift, 33's and a ZJ DS and it's perfect.

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No but the adjustable upper and lower control arms I put in so I can center the driveshaft did


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post #15 of 16 Old 09-27-2019, 09:01 AM
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No but the adjustable upper and lower control arms I put in so I can center the driveshaft did


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I don't know exactly how much additional length is needed. However, it's actually probably pretty close. There are guys that have ran the stock DS until it blew (I did for about 6 months).

Adjustable CA's are intended to bring your axle and pinion angle back to factory spec. Meaning, it's where it was when the vehicle is at stock height in relation to the forward-back (centered) location in the wheel well. Your axle didn't actually come forward at all. It should be where it was originally.

With adjustable CA's you're typically extending the bottom about an inch or less and pretty close (if not shorter than stock) on the top. That's the reason why many 4"lift kits don't include uppers, just lowers.

Your driveshaft does need some extra length in order to function properly but it's nowhere near 4" you lifted the Jeep. It's probably closer to 2".

We have similar setups. A ZJ shaft will work fine. If you want to spend more getting a specific custom shaft then go for it.

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