transmission

[scouse lanny]

hi there all just been reading the new landrover owner mag and come across this bit saying ANOTHER SOLUTION IS TO REPLACE THE GEARS IN THE TRANSFER BOX.THE HIGHER RANGE GEARS FROM A DISCO ARE A LOWER RATIO THAN THOSE FITTED TO A DEFENDER ,MEANING THAT TOP SPEED ON ROAD CAN BE INCREASED WITH OUT ALTERING THE LOW RANGE GEARING. anyone know how much would b looking at to get that done sick of plodding along not bothered going just going home when u ar staving and tried starts getting to u  :lol:

[Xtremeteam]

right,to do that you need to fit a discovery transfer box which is a 1.2 ratio as your current Tbox will be a 1.4 ratio,now by doing this it will increase the highrange gearing but low box is the same across the range in all the Tbox's,only thing with doing this is if you have 750's or 235/85/16 or bigger tyres you may find that your motor will struggle to pull 5th,

[scouse lanny]

cheers mate think i will leave it iwas going to pm you wanted to no if u get a lot more power with u have no exhaust boxs fitted  just been reading about it have u or do u no any other good ways of getting more power  :lol:

[Porny]

cheers mate think i will leave it iwas going to pm you wanted to no if u get a lot more power with u have no exhaust boxs fitted  just been reading about it have u or do u no any other good ways of getting more power  :lol:

Wind the boost up to 1 bar and tweak the pump... will go quite well then!

Removing the large centre silencer makes a difference, not huge.... but noticeable...  

There are other things too.....    :D


Ian

[scouse lanny]

come on porny tell me more my friend  :lol:  do u think by gettin disco top end gears would gmake it fast cos i had a 300tdi with big mud tyres and that still went well or should i just stick to mod the engine

[tonycougar]

right,to do that you need to fit a discovery transfer box which is a 1.2 ratio as your current Tbox will be a 1.4 ratio,now by doing this it will increase the highrange gearing but low box is the same across the range in all the Tbox's,only thing with doing this is if you have 750's or 235/85/16 or bigger tyres you may find that your motor will struggle to pull 5th,

How would I be able to tell if this has already been done? Mine sometimes seems to lack a bit of pull in 5th especially under load, not too bad without any trailler. Can get 70/80 out of it then.

[paul_humphreys]

If its still there, theres a lable on the transfer box.

Paul

[smo]

right,to do that you need to fit a discovery transfer box which is a 1.2 ratio as your current Tbox will be a 1.4 ratio,now by doing this it will increase the highrange gearing but low box is the same across the range in all the Tbox's,only thing with doing this is if you have 750's or 235/85/16 or bigger tyres you may find that your motor will struggle to pull 5th,

How would I be able to tell if this has already been done? Mine sometimes seems to lack a bit of pull in 5th especially under load, not too bad without any trailler. Can get 70/80 out of it then.

I'll bet yours is standard, 70-80 unloaded is normal with 1.4 gearing, no supprises about it when towing!

I had a 1.2T-box in my 110 and it went really well, it did however have a huge allisport intercooler and chip tho (and was a TD5).

If you want better road speed or lower revs for current road speed then do the change (or get it done for you) and then tweek the engine a bit too :D The cost is about £450-500+vat to get it done though, so not the cheapest of mods.

[graham2306]

If you do a lot of miles the £450-£500 shouldn't take long to save with current deisel prices.  Having just put a 200Tdi engine in my 90 to replece the 2.5NA I am now thinking about the Disco transfer box as I seem to have plenty of power but fuel consumption is just as bad as it was before.

Other option is an overdrive, I know I can't fit a Series one but weren't there some Range Rovers fitted with overdrive?  And GKN do a bolt on goodie too.

Graham

[smo]

Youll not make the money back, it saves you 1-2mpg, which even in LR terms is naff all so itll take many many hundreds of thousands of miles to recoup the cost, the overdrive option is even worse as it costs double and only returns the same saving as the gearing change.

[Xtremeteam]

rangie ones dont fit either as they were designed for the 4 speed box   ,

if you are running 205/16's in a defender with  tdi then fitting a disco Tbox will give it the same gearing as a disco (tyres & gear ratios) so should do disco MPG,i was planning on fitting my transferbox today but having just got up i think ill be doing it another day

[graham2306]

Thanks for that guys.  The bit I can't work out is that last winter I went up to Wales with a mate in his Discovery.  Cost me £90 in diesel for the 2.5 NA and him £60 in diesel for his Disco.  By my calculations that is £30 saved over about 400 miles.  So £500 quid should only take 6,666.66 miles to payback.

OK it's a bit of a crude calculation but 6K or so miles looks like the payoff point.

By the way Mike, thanks for the help with the airfilter.  In then end I found one from a Peugot 307 diesel in a skip and it mounts perfectly on the air conditioning mounts on top of the timing belt cover.  Popped in a K+N filter and trunked it over to the turbo.  It's taking in air from the coldside of the engine and it runs a treat.  Now I'm looking for the right size pipework to make up a snorkel for it.

Graham

[smo]

I'll bet you the cost of 6666.66 miles of diesel that you dont save THAT much, gearing and tyres are only half the story, aerodynamics, weight, driving style, road, condiitons etc all dictate MPG and i know from experience that although the Q gears make the drive either faster or more plesant they dont increase MPG by a massive ammount. :)