R25 v6 gearbox
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Thread: R25 v6 gearbox

  1. #1
    farmerdave
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    Icon5 R25 v6 gearbox

    Hi all,
    What manual gearboxes are suitable to replace a dead auto on a 1986 R25 v6?
    I've come up with UN1-03, NG9 from a quick google search.
    Any other options which will take the torque of the v6? UN1 (4cyl), NG3?
    Anyone have one?

    Regards,
    Farmerdave

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  2. #2
    Budding Architect ???? pugrambo's Avatar
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    where are you going to get a flywheel from
    i'd start with locating one of them first then look for a box
    V6 flywheels are just about made from unobtanium unless you have a source somewhere either tomato or BBQ
    i may be able to find a flywheel for you but the freight is the killer
    i do have ideas on how to make one though but see how you go
    it all comes down to how much of a hurry you are in
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  3. #3
    Simon's Avatar
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    Besides the ones that you have mentioned, there is also the Type 369 from the Renault 30 V6. However that may require a bit more adaptation for things like the gearchange not being original equipment to a Renault 25 etc..

    As for where to find one, I'd say there is more chance finding one in NZ than AUS as neither the 30 V6 nor the early series 25V6 were sold in AUS. We only got a handful of the 25 Mark 2 in automatic form, even then the impossible to sell unsold ones were exported to NZ when new.

    Failing that the next likely choice would be a euro wrecker that exports.....

    http://www.wattel.com/us/default.asp

    In AUS there were a few bought in for the off road buggy scene, with a V6 motor attached they do pop up occasionally but are few and far between.

  4. #4
    1000+ Posts Haakon's Avatar
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    I reckon youre only chance is to import one from the uk, along with a pedal box, linkages etc.

    Could ask an Alpine specialist such as Alpine Affair or Rennosport in Melbourne if they can find or import a gearbox.

    Ask the friendly chaps at www.renault21turbo.com if they can help out, as I'm sure they know where to get odd reno bits in the uk!
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  5. #5
    Fellow Frogger! deja vu 25's Avatar
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    Guys

    I think the UN1-03 will suffice. I don't see why the UN1 from an R25 GTX, which you should be able to find in NZ pretty easily would not do?

    That's what I stuck in my GTX auto.

    The V6 only hass 144 hp compared to the GTX 123hp. The box would be fine.

    I used the Auto flywheel, and it woked a treat. You could do the same I am sure.
    Cheers - Luke

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  6. #6
    1000+ Posts Europa's Avatar
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    Quote Originally Posted by LukeCass
    Guys

    I think the UN1-03 will suffice. I don't see why the UN1 from an R25 GTX, which you should be able to find in NZ pretty easily would not do?

    That's what I stuck in my GTX auto.

    The V6 only hass 144 hp compared to the GTX 123hp. The box would be fine.

    I used the Auto flywheel, and it woked a treat. You could do the same I am sure.
    Driven gently, it should be fine. It's the extra torque that makes the V6 harder on boxes I think you'll find...

  7. #7
    Simon's Avatar
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    Quote Originally Posted by LukeCass
    Guys

    I think the UN1-03 will suffice. I don't see why the UN1 from an R25 GTX, which you should be able to find in NZ pretty easily would not do?

    That's what I stuck in my GTX auto.

    The V6 only hass 144 hp compared to the GTX 123hp. The box would be fine.

    I used the Auto flywheel, and it woked a treat. You could do the same I am sure.
    As Europa has indicated torque is the likely killer for the 4 cyl gearbox used on a V6. There are a number of different spec components in a 4 cyl box and V6 UN1.

    Also I'm confused by "I used the Auto flywheel, and it woked a treat. You could do the same I am sure."

    Foregoing the fact that there is likely a difference between the attachment of the flywheel between a 4 and a V6 to the crank, the auto "flywheel" is a combination of a sheet steel driveplate that attaches to the crank and the torque converter which attaches to the driveplate. Methinks using the auto driveplate attached to a clutch would be a bit more difficult than using a Fuego flywheel for a 25 4 cyl gearbox conversion. Also I doubt the clutch plate would last very long scraping on the driveplate, as well as the driveplate being very flexible!! Perhaps that is where the rattle under the car is coming from :-) !!

  8. #8
    Fellow Frogger! deja vu 25's Avatar
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    No rattle fixed. It was the driveshaft nut coming loose!!!!

    I am only telling you what I know about the auto flywheel. The mechanics said this is what they used. Maybe they didn't. Must check the left over spares under the house.

    I still wouldn't have thought the little bit of extra torque from the V6 would hurt the gearbox. After all, don't they attach the R20 and R25 boxes to Commodore engines in the buggies etc??
    Cheers - Luke

    1990 Renault 25 V6 Baccara - Gunmetal Grey
    1974 Renault 17TS (1317) - Silver

  9. #9
    Simon's Avatar
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    Quote Originally Posted by LukeCass
    I am only telling you what I know about the auto flywheel. The mechanics said this is what they used. Maybe they didn't. Must check the left over spares under the house.

    I still wouldn't have thought the little bit of extra torque from the V6 would hurt the gearbox. After all, don't they attach the R20 and R25 boxes to Commodore engines in the buggies etc??
    I'd be wary of a mechanic that didn't know the difference between a driveplate and a flywheel :-)

    Those buggy gearboxes are likely to be 369 R30 and UN1 V6 type gearboxes. A fair number were bought in attached to Renault V6 motors for the off road buggy's.

  10. #10
    1000+ Posts Haakon's Avatar
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    Quote Originally Posted by Simon
    I'd be wary of a mechanic that didn't know the difference between a driveplate and a flywheel :-)
    I agree. I certainly hope he meant something else, as there is absolutly nothing common at all b/w auto and manual from the crank to the hubs.
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  11. #11
    1000+ Posts Europa's Avatar
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    Quote Originally Posted by Haakon
    I agree. I certainly hope he meant something else, as there is absolutly nothing common at all b/w auto and manual from the crank to the hubs.
    Well, he'd have to, wouldn't he - of course there is no way the torque converter driveplate could be used as a flywheel/clutch surface!

    As Lukes R25 was a 4 cyl, I'd say he'd have sourced one from a wrecker. Fuego flywheel would have fitted?

  12. #12
    Simon's Avatar
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    Quote Originally Posted by Europa
    As Lukes R25 was a 4 cyl, I'd say he'd have sourced one from a wrecker. Fuego flywheel would have fitted?
    I just love how mechanics describe things to their clients :-)

    Fuego or 20TS would be the easiest source in AUS for the 4 cyl conversion, in the absence of a 21 or 25 direct replacement.

  13. #13
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    Hi farmerdave,
    The UNI Transmission was used on the V6 Modells and the 4 Zylinder GTX (5 Stud wheels). All other 4 Zylinders Engines of the R25 are equiped with the NG3 Transmission.
    Any UN I Transmission should be strong enough for the V6 engine. But do get a V6 Tranmission as the bellhouse of the 4Zylinder would not fit. Only the final drive ratios of the UNI differ. As far as a know for an auto- manual conversion you would also need a new flywheel and a different ECU. (apart from pedals etc) If you have more specific questions just ask: I have got the complete workshop manual for the R25.
    A cheap german source would be www.madcom.tv. That is a german wrecker specialised on Espace, R25 and R21. Andreas should know English. Anything under 20 kg (flywheel??) would cost 60 Euros to be send over.
    I believe that I would be easier to fix the gearbox. Cheap parts are avaiable at VWs dealers- as the same transmissions were fitted to some Audis and VWs.
    I myself drive a Renault 25 td (89) with 400tkm with severe rust problems. I just got a new R25 auto (1989) with leather interior for 30 Euros (engine missing) to drop in my diesel engine and gearbox. You can see my car under
    http://renault25.de/DanielsTDX.htm

    Best regards,
    daniel
    p.s. I lived in rural Victoria for 15 month but hardly ever came across french cars.

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