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Thread: Swapping parts between axles RRC (1977) to Discovery (1993)

  1. 2nd January 2015, 11:19 PM #1
    stirlsilver's Avatar
    stirlsilver
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    Swapping parts between axles RRC (1977) to Discovery (1993)

    Hi all,
    I'm in the process of pulling apart a front axle that came out of a 1977 range rover and transplanting some of the bits into the axle of the car I'm building (1993 Discovery).

    Why am I doing this? Because the Range Rover axle has:
    *24 Spline ARB locker
    *HTE 24 spline/ 23 spline shafts
    *23 spline to 10 spline CV's (which i understand are reasonably strong?)

    Initially I planned to simply roll the range rover axle straight onto the discovery. However this was not possible because the radius arms are different (the range rover radius arms have smaller pins at the chassis side and are thinner at the axle side).

    I've started pulling both axles apart and I'm noticing a few differences:
    *Swivel balls are smaller on the range rover/ compared to the disco
    *Differential assembly has a thick flange on the range rover but the disco is thinner down the sides (and has 4 shorter studs)
    *Range rover has a 2 part CV with a stub that has an integral drive flange, the disco has a splined drive flange with a single piece CV
    *Range rover stub axle is longer than the discovery stub axle

    Below is a photo showing the shafts, CVs and drive flanges between the range rover axle and discovery:



    I have a few specific questions:
    1. Can I fit the differential assembly from the range rover axle onto the discovery axle? Is all that is required is for the shorter studs to be changed to longer studs?
    2. Can I fit the range rover CVs into the discovery axle? It looks like I would need to fit the range rover axle stub and wheel hub to allow this. Is this correct? Would I run into problems anywhere else? i.e. misalignment of the break disc with the caliper?

    Any information would be greatly appreciated!!

    Thanks,
    Stirling
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  2. 3rd January 2015, 12:05 AM #2
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    landy
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    Hi Sterling,
    Correct me if I'm wrong. You want to put the ARB locker from the RR into the Disco?
    The ARB locker is a 10 spline and the half shaft is the top one in the bottom photo. You can't swap the side gears between diff centres obviously and you can't use the RR half shaft minus CV joint as the inner axle seal runs on sections of the half shaft that appear to be located at different locations along each half shaft.
    You can't swap CV joints because they are completely different.
    I've never actually tried this conversion but I don't think it's possible given the parts you have available. You might possibly be able to buy a pair of suitable half shafts but I don't think it would be worth it.
    I really think you are better off selling your locker and buying the correct one for your disco.
    I've been involved with people that mix and match and it rarely works well.
    Do it properly and do it once. It will make sourcing axles so much easier if you break one on the tracks.
    Good luck whichever way you go.
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  3. 3rd January 2015, 07:45 AM #3
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    stirlsilver
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    Hi Nino,
    Thanks for the info. According to the KAM website, it looks like all shafts for discos and range rovers prior to 1994 are the same?

    The differential in the Range Rover axle is a 24 spline differential. The shafts that came out are the bottom ones in the second photo.

    Thanks,
    Stirling
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  4. 3rd January 2015, 09:38 AM #4
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    AllTerr
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    The guy I bought my D1 from tried using the CV's from a RRC on the axles (MD) with catastrophic results. The CV's, while able to fit, are considerably weaker. Below is the result of said experiment to save $$

    Hmmm... Won't let me upload any photos of any size.

    Anyways, I wouldn't do it if it were me. I'd spend the $$ and buy the upgraded axles and CV's. Otherwise it'll end up like mine and you'll have a cracked cv, and an axle that looked like it went through a grinder...


    Sent from my iPhone using AULRO mobile app
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  5. 3rd January 2015, 10:02 PM #5
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    Lockee
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    I prefer the early rangie cvs and the outer mushroom short axles as they are the weak link easy to replace. Most winch challenge guys swapped from later ones as broke more cvs
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  6. 4th January 2015, 06:21 PM #6
    ROAMER_AUS
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    Hi Sterling!!

    I think I bought complete front and rear housings from you long while ago.

    I just installed rear diff and front drive shafts few days ago

    I hope you finished your project by now!!!
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