Vario 814 gearbox 5 or 6 speed ?

814da

Overland Dreamer
#1
Hi all I have a dilemma that I am looking to solve I have a 2003 814 vario with a 5 speed zf s5-42 gearbox Center top shifter and would like to fit a 6 speed box also with the Center top shifter !

Question what 6 speed gearbox was fitted to the vario ? Is it the zf s6 -850 ? As this appears to have the shifter on the side and requires a oil cooler?
I have asked mb uk with no luck as they wanted a chassis number off a 814 with a six speed box to work from

Any ideas are welcome thanks mark
 

Sitec

Adventurer
#2
Hi Mark. What's the reason for the change? More speed or just better ratios? I believe the ZF 5-42 is already an 'overdrive' box, as it's the same gearbox found in the old Leyland Daf Roadrunner truck... and it's sat behind a 150hp 5.9 Cummins 6 cylinder, so is a strong box. I fitted the Cummins/ZF combination into my 101 Land Rover and never had an issue with the box...
 

814da

Overland Dreamer
#3
Hi thanks for the reply I want to improve my road speed ratios as I about to switch the transmission on my truck from 2 to 4 wheel drive I have a donor 814 da 4x4 but having done the maths on the ratios will lose 20% of my top road speed requireing me to do over 2000 rpm to maintain a 56mph cruising speed, if I switch the gear box to a six speed this will bring my top road speed back to 56mph at at 1700 rpm,

The question is which six speed gearbox did Mb fit to the vario ?
 
#5
There is virtually no difference between the top gear ratio on ZF S5-42 and current Ecolite 6 spds. Save your money and spend it on changing the diff ratio to your liking.
The S5-42 with deeper 1st had 5th at 0.76. The S6-650 used in some American pickups for a while had 6th at 0.72, only 5.25% faster, not 20%
 

Sitec

Adventurer
#7
And if you get really stuck, I designed a conversion plate to make a Land Rover LT230 full time 4x4 transfer case fit a ZF 5-42. This gives you full time 4x4, High, Low and a choice of ratios. There's a group on Facebook called Cummins Land Rover Group (CLRG). One of the fella's on there (Reece Myers) has marketed my kit and the billet gear to convert the ZF output splines to the LT 230 transfer case. :) ZF to LT.png
 
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