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4 speed gearbox vs. 5 speed gearbox

Discussion in 'T3 & T4 Tech Help Clinic' started by bilckster, Jan 28, 2009.

  1. bilckster

    bilckster Member

    Messages:
    157
    Location:
    Sydney, Australia
    I have been mulling over the idea of taking out the original 4 speed gear box from my 82 transporter and putting in a later model 5 speed gearbox.

    The hope is that I will get better fuel economy (only getting 350-400 to a tank at the moment) and a higher max speed (right now it sits on 110 comfortably. I wouldn't mind getting it up to 125).

    I guess the most important question is will a later model, watercooled 5 speed gearbox fit in my '82 Microbus?

    Can I expect to get much better results, especially in terms of fuel efficiency, from a 5 speed gear box?

    Is it worth it? I've seen 5 speed gear boxes for sale on here for about $800 and I imagine it would be about 4 hours labour. Will the resulting savings in petrol cost outweigh the cost of the new gearbox?

    Any thoughts, comments or observations are welcome.
     
  2. kombijon

    kombijon Member

    Messages:
    747
    Location:
    Perth, WA
    yes the 5speed will fit but you will need the gear linkage and i think the selector gate in the base of the gear stick.
    i can sell you a 5 speed box for $500 inc gear linkage but not gear stick bits.
    i'm not 100% sure wether you will save much money on running costs but if thats your intention why not spend the cash on LPG? you wil re-coupe all the money plus some within 12months!

    cheers jon. ps i'm in WA
     
  3. bilckster

    bilckster Member

    Messages:
    157
    Location:
    Sydney, Australia
    Hmmm, good point. I might have to look into the costs for that.
     
  4. Kombi Dad

    Kombi Dad Well-Known Member

    Messages:
    2,445
    Location:
    Bungendore, NSW
    I went over this same issue when I first bought my '82 ten years ago. Advice from Nick out at Volksparts was don't. The later box was not as robust as the earlier 4 speed. The gears are closer spaced so you don't gain much if anything. I remained with the 4 speed and fitted a locking diff which has worked fine for the type of camping I do. Cruise speed is 95 km/h towing the trailer but can do 110. The fuel consumption at 110 is a lot higher so 95 is it. Seems to me that at 95 one can lay back and enjoy the world much more than up at 110 especially in a kombi.

    I have dreamed of fitting a box out of a synchro if I ever came across one that could be restored. That would be quite beneficial in the scrub, methinks.
     
  5. bilckster

    bilckster Member

    Messages:
    157
    Location:
    Sydney, Australia
    Thanks for the feedback. I was a bit apprehensive about it all as I don't like pulling apart something that is working well and in great original condition. I think I'll leave it as is for now.
     

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