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Thread: Caravan PTU info

  1. #21
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    Re: Caravan PTU info

    Now I run the 2.4 block, I thought I read it needed very little clearance on the case.

  2. #22
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    Re: Caravan PTU info

    That may be true. I think there is more clearance for the 2.4.

  3. #23
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    Re: Caravan PTU info

    I talked to Gary at Peloquin hes on board for me sending diff in to make it direct swap for 3 speed. I just wish ptu ratio was a more common ratio.

  4. #24
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Caravan PTU info

    Quote Originally Posted by Reaper1 View Post
    Because of the position of the ring gear being on the input shaft, the case protrudes past the adapter plate/bearing carrier of the transmission. This causes interference with the oil pan rail on the engine and part of the block if it's a 2.2/2.5 or a 3.0 V6. Grinding can clearance things, but I'm not too big of a fan of that solution as I'm unsure about the compromise to any strength of the parts by doing this. I'm sure for low power stuff and soft launches it'll be fine, but start abusing things...well...who knows? For this reason, that is why I like the Pacifica unit. I just recently found out that the newer Jeep Cherokee PTU is designed in a similar way, but it includes electronically controlled hi/low ranges. According to this video it's 2.92:1 instead of the 3.xx:1 of the van and Pacifica https://www.offroadxtreme.com/featur...e-14-cherokee/
    Having a KL Cherokee 4x4 now, I wondered how well that could swap into one of the car bodystyles. With the 3.2 v6 being like 271hp, I wondered how the driveline would handle about 350hp, and in a lighter body. Or, swap the 3.6 in it's place and get better torque.
    I've only got like 3500 miles on mine, so I haven't really even got on it hard yet. But it moves pretty good in normal mode. I bet sport mode is punchier.

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  5. #25
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    Re: Caravan PTU info

    Quote Originally Posted by boots View Post
    I talked to Gary at Peloquin hes on board for me sending diff in to make it direct swap for 3 speed. I just wish ptu ratio was a more common ratio.
    I wonder if he'd be willing to make just the case part for existing OBX/Quaife/Peloquin/TU units for AWD use? I inquired about this when TU was doing their run, but it wasn't in the cards.

  6. #26
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    Re: Caravan PTU info

    I don't follow? Why would he make OBX/Quaife parts? He will make anything if the money is right. If I have him make the AWD diff for the 3-speed auto, I will be putting $6000 up. Hes not going to do everything and sit on 10 units.

  7. #27
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    Re: Caravan PTU info

    The only difference between the regular diff and the AWD diff is that the case on the right side has the drive splines for the PTU and the larger bearing/seal surfaces. I have looked at it over and over and there's no way to simply "add" that on. So, if just that side of the thing was made and could accommodate the already existing guts, I would think that would cut down on cost and labor.

  8. #28
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    Re: Caravan PTU info

    If that's all that is needed, then that's the route gary will go. He just wanted a sample piece in his hand. But the 41TE is taller end to end when compared to the 3 speed correct? Does the large bearing/adapter fit into the 3 speed passenger case bore?

  9. #29
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    Re: Caravan PTU info

    Quote Originally Posted by boots View Post
    If that's all that is needed, then that's the route gary will go. He just wanted a sample piece in his hand. But the 41TE is taller end to end when compared to the 3 speed correct? Does the large bearing/adapter fit into the 3 speed passenger case bore?
    I believe the 41TE is taller due to a thicker FD ring gear. It's been a while since I've read up on this. There was a thread about adapting the OBX to the 413 a long time ago.

    I honestly don't know if it is the same bore size. I *think* so, because it fits the 5-speed cases without modification from what I remember. You just have to drill/tap 1 or 2 holes for the bolts. Crap...I gotta go read that thread again! LOL Maybe Brent and I can much with it some. He has at least 1 A670 and a number of 5-speeds.

  10. #30
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    Re: Caravan PTU info

    I need to get my hands on an adapter and do some fitting. More than likely will have to reproduce them so Im not searching junk yards.

  11. #31
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    Re: Caravan PTU info

    Quote Originally Posted by boots View Post
    I need to get my hands on an adapter and do some fitting. More than likely will have to reproduce them so Im not searching junk yards.
    OK, so Friday afternoon I went and re-read a bunch of the AWD threads. Carlos bored out the bearing retainer, but I think that's because he used a 5-speed one instead of the AWD one for some reason. I am still a little lost on that. The bolt holes on the retainer/adapter don't line up to the case, so those need drilled, but that's not a big deal.

    Seems like the 3.0 V6 works with the van PTU with a little interference, but not bad. The 2.4 needed some clearancing, but also not bad. It seems the 2.2/2.5 is the "problem child". If the weather ever frigging breaks, I'll give it a go. I am SO done with the d@mn rain!

  12. #32
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    Re: Caravan PTU info

    Yea my understanding was he bored the driver side retain due to the larger bearing. Nothing stated about pass side for the awd adapter.

  13. #33
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    Re: Caravan PTU info

    Quote Originally Posted by boots View Post
    Yea my understanding was he bored the driver side retain due to the larger bearing. Nothing stated about pass side for the awd adapter.
    OOHHH!!! Driver's side! I thought that was the same size for some reason. That makes more sense! Duh!

  14. #34
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    Re: Caravan PTU info

    Quote Originally Posted by Reaper1 View Post
    OOHHH!!! Driver's side! I thought that was the same size for some reason. That makes more sense! Duh!
    Apparently it depends on the year or some other difference. My 93 AWD diff worked with out modifying the transmission case beyond drilling the new holes for the PTU mount/bearing housing.



    Here's a pic of how much I had to relieve the block for the lump on the back of the caravan PTU to clear.


  15. #35
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    Re: Caravan PTU info

    Thanks for sharing that! I was always curious how much grinding had to be done. That honestly doesn't scare me all that bad. I am really curious about the 2.2/2.5 block. If the weather stays clear this weekend I might actually try it. I have a junk block specifically for doing mock-up stuff I can use and grind on with no fear.

  16. #36
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    Re: Caravan PTU info

    I know that Carlos said the 2.2 block was a no go but I never tried it, my plan was to go 2.4 all along. Hopefully I get some things sorted out this year and can get this project rolling again.

  17. #37
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    Re: Caravan PTU info

    I'm trying to get my shop built at my house this year, then plan to focus on making a awd setup for the car. I just don't think I can make both happen. I'll at least get the LSD figured out for the 3 speed auto.

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