Diff ratios

meanfalcon
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Posts: 19
Joined: August 23rd, 2008, 9:00 pm

Diff ratios

Unread post by meanfalcon » May 29th, 2010, 12:22 pm

I guess at some stage almost everyone thinks about it. Now that my tyres are 90mm (diameter) larger than they once were, I sure am. Low range engine braking, combined with the auto, is only good for about a 20 degree decline and the highway towing is difficult having to maintain 120 kph in top gear for the engine to develop enough torque to cope on the flat ground. There is KAM and Ashcroft. What will be the best economical outcome? I expect 4.1:1 is the most common with the ideal towing speed being 80-90 kph.

Disco_S.two
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Joined: May 2nd, 2008, 3:19 pm
Location: Toowoomba

Unread post by Disco_S.two » June 2nd, 2010, 4:30 pm

Diesel or petrol?

I have the diesel with 265/75R16s and when I went to larger tyres I just got my ECU re-mapped and just stay on 91 speedo = 100 road. (you can get a Truspeed unit to correct this error if you want).

I think 3.54:1 is std, I believe there is a 3.8:1 option. the 4.11s are for if you've gone to 285/75R16s or bigger.

Waz

meanfalcon
Getting to know the place
Posts: 19
Joined: August 23rd, 2008, 9:00 pm

Unread post by meanfalcon » June 12th, 2010, 2:33 pm

I have the V8 petrol. I can get a chip to help the engine for $600. Anyone tried this? or replace diff gear sets from $2800 - $3700.
Or Buy a series 4 for $85,000.
Or **** the economy just drive around burning 20-25 litres per 100kms.

Mick.

disco_thrasher
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Joined: December 26th, 2006, 6:38 pm
Location: @ work

Unread post by disco_thrasher » July 13th, 2010, 12:17 pm

meanfalcon wrote:I have the V8 petrol. I can get a chip to help the engine for $600. Anyone tried this? or replace diff gear sets from $2800 - $3700.
Or Buy a series 4 for $85,000.
Or **** the economy just drive around burning 20-25 litres per 100kms.

Mick.
i dont know where you got those prices from day light robbery
Great basin Rovers in the US Salt lake city landed in oz for $990
give Bill a ring
Cheers Kelvin
[color=black]TD5 disco2 4 big black things which are 35" stuff locked up front and out back 49%maxidrive rock crawler reduction gears 4.14:1 diffs and others stuff too yada yada[/color]

meanfalcon
Getting to know the place
Posts: 19
Joined: August 23rd, 2008, 9:00 pm

Unread post by meanfalcon » August 2nd, 2010, 6:56 pm

That price is fully installed.
Ashcroft gears-$1200
Getting them set up in the diffs-$600
Remove and replace also a conversion on
the tailshaft to remove the rubber thing-$1000

Sound any better.

I got the bruce davis ecm fitted.
Hardly notice the difference.
I''ll run a couple more tanks and
post some results later.

disco_thrasher
Been here a while
Posts: 142
Joined: December 26th, 2006, 6:38 pm
Location: @ work

Unread post by disco_thrasher » August 4th, 2010, 10:47 am

meanfalcon wrote:Remove and replace also a conversion on
the tailshaft to remove the rubber thing-$1000

.

holy moly 1000 for that yell them they dreaming
[color=black]TD5 disco2 4 big black things which are 35" stuff locked up front and out back 49%maxidrive rock crawler reduction gears 4.14:1 diffs and others stuff too yada yada[/color]

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