How Much UnderDrive is TOO MUCH

[CheekyD1]

With several members now with extreme underdrives fitted I am looking for the answer to the question....
What is your total final drive ratio and how do you find it works?

Thanks

Gaz :)

[Psimpson7]

Hey Gary

Std low range in mine is 43.4:1
underdrive is 116.76:1

(269% lower)

I am running std 3.54 cw+p's

The biggest advantage of the Underdrive is that it doesnt mess up your existing gearing

At the Springs the other weekend the Underdrive was awesome.... I could idle everywhere including up the rock tracks behind the house.

At the wet levuka a few weeks earlier not so much!

You are more than welcome to have a go in it next time we catch up.

[Outlaw]

How much is TOO much??? Maybe when the snail on the ground is beating you :p

[Grimace]

80:1 is good

120:1 is great

150:1 is gettin silly but still cool :D

anything over 180:1 is too much!

[Presto]

Landy bits are doing them! :)

Land rover underdrive | eBay (http://www.ebay.com.au/itm/Land-rover-underdrive-/200758099727?pt=AU_Car_Parts_Accessories&hash=item2ebe1d7f0f#ht_500wt_665)

....you know you want one! :p

[CheekyD1]

Landy bits are doing them! :)

Land rover underdrive | eBay (http://www.ebay.com.au/itm/Land-rover-underdrive-/200758099727?pt=AU_Car_Parts_Accessories&hash=item2ebe1d7f0f#ht_500wt_665)

....you know you want one! :p

Love this bit



Pls note, although the Underdrive will fit the Disco LT230 transfer case it will foul the rear footwell so the bodywork will have to be modified to clear.


Pass the Sledge hammer please :p

[Presto]

I wonder how much 'adjustment' it needs? :)

[Timj]

Probably about a 10lb sledgehammer's worth. :)

[blitz]

I think Grimace summed it up pretty well.

If you go too low you can do as much damage because to the torque multiplying factor, I saw a brilliant youtube a while back of a jeep flipping over in slow motion because it just didnt stop - up up and over. it was going up and over a rock

[disco_thrasher]

No thats just a driver who has no idea what to do with all the toys he has on his truck

I saw a brilliant youtube a while back of a jeep flipping over in slow motion because it just didnt stop - up up and over. it was going up and over a rock

[CheekyD1]

I think Grimace summed it up pretty well.

{snip}

Yes I think so Too, that and Pete's answer has made up my mind

I have two choices of underdrive box 2.7:1 (final Drive Ratio 79.8) or 4:1 Underdrive = Final Drive of 118.2
The Stock-ish final drive as it sits now is 35.2

I was thinking that 118 might be too much.. Thanks Guys for seting me straight :angel:

Additional up side of the 4:1 Underdrive is that it gives three choices of Final Drive Ratio of 35.2, 43.8 and 118.2

[Presto]

Sounds like the Cheeky shed has some grand plans!? :twisted:

[harry]

Sounds like the Cheeky shed has some grand plans!? :twisted:

it's a jeep thing,
i don't understand.:wasntme:

[CheekyD1]

it's a jeep thing,
i don't understand.:wasntme:
Judging from the great example at the side of you house yesterday, me thinks you understand more than you let on :cool:

[LowRanger]

I have an Underdrive and 4.1 diff centres in my Defender and a final drive ratio of 135:1 and love it :D
And as Pete says,it is great to be able to just idle up places where previously you had to put your foot down.

And seeing that the truck is only a 200Tdi,it is great to be able to bring the revs up in a low gear to bring the turbo on,and still be doing no more that walking pace:cool:
Once you have had one,you won't go back

[blitz]

No thats just a driver who has no idea what to do with all the toys he has on his truck

To be fair to drivers who do know what they are doing with theirs mods, your quite right