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I have an XF wagon on LPG with a 3 spd auro b/w gear box. Am looking at options to improve economy (many highway km's travelled)and hear that the b/w Model 40 g/box fitted to the ZL fairlanes had an internal o/drive - ie you could not select o.d. from gear selector. Does anyone know if this is true ? Other option is to change to a lower diff - any thoughts?
thanks
Andrew
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from what i know there is no difference between a xf and zl box.i have never heard of an overdrive in these boxes.a 2.77 diff would make a difference if your car doesn't already have 1.a manual would also be cheaper on fuel but you'd have to find 1 then c
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i was once asked how do i want t spend to save? fitting a new gearbox could cost a bit to get it all work properly..
I would suggest that jsut make sure things like timing is right, plugs are good, oild is good etc etc, as these certainly wont help econ
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No the b/w model 40 found in XF's and ZL's doesn't have an over drive. 3rd gear is a 1:1. later model g/boxs from late EA and up to AU have a 4th gear over drive but fitting one of these boxs may be difficult and expensive. a better option may be to get a
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They weren't very popular and the aren't very strong. A few people have them behind their V8's.
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E series gearboxs wil be harder to fit to X series cars because the starter motor is on the other side (passengers side) of the motor on E series...
Just a quick thought...
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Thanks Tuff 250,
The 2.77 diff seems the way to go, to a layment what's the difference between an LSD and a normal diff and would one fit onto a wagon?
Would i be able to use my same axels (with discs) and just replace the diff itself. Do you know
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sorry mate i didn't realise you had a wagon.xf sedan and wagon diffs are different because a wagon has leaf springs and a sedan has coils(which means different mounting points).a lsd spins both wheels where a normal diff only spins 1 on dry bitumen.it don
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QUOTE: "an LSD spins both wheels". A more adequate description would be: An LSD delivers power to the wheel with the most traction. If for instance a vehicle has one rear wheel on the road and the other on the gravel shoulder. initial accelerati
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