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Swapping ford diff for landrover diff
scoop - 19/7/11 at 12:42 PM

Is the swap to the landrover 4.1 diff a straightforward one from the sierra 3.62 i have in at the moment and if so whice one do i want?

MK9R - 19/7/11 at 02:13 PM

are you on about a freelander diff? if so they are 3.21:1

scoop - 20/7/11 at 08:29 AM

I have read many times about people using the freelander 4.1 diff but didnt know if it just bolted in and you use the sierra drive shafts

MK9R - 20/7/11 at 08:35 AM

the freelander 1 diff will require different drive shaft and prop lengthening. The ratio is 3.21.:1 not 4:1, they only made one ration

[Edited on 20/7/11 by MK9R]

Doctor Derek Doctors - 20/7/11 at 12:51 PM

quote:
Originally posted by MK9R
the freelander 1 diff will require different drive shaft and prop lengthening. The ratio is 3.21.:1 not 4:1, they only made one ration

[Edited on 20/7/11 by MK9R]


I'm sure Westfeild did a 4.1 Ratio Freelander Diff, but it may have only been for the LSD's they supplied, I say this becuase I'm actually picking one up tonight from another LCB'er so I'll confirm that it is 4.1:1 ratio.

As for the conversion it will be a case of some new mounts (not to hard) and some new driveshafts, these will either have to be made bespoke or you have to cut them and have them sleeved and welded.

Some stuff from WSCC here about 4.1 ratio Freelander Diffs

http://boardroom.wscc.co.uk/cgi-bin/ikonboard.cgi?act=Print;f=3;t=76141

MK9R - 20/7/11 at 04:53 PM

Maybe there is an aftermarket 4.1 freelander crown wheel and pinion set, but in standard form landrover only ever supplied a 3.21 in the freelander 1.

sjmatthews - 20/7/11 at 06:23 PM

Scoop

Why not just change the ratio of you Sierra diff, which would be a lot less work?

I have a 3.92 7" open Sierra diff you may be interested in. It's in excellent condition, just removed it from my Fury to fit a 3.62.

Steve

Kev36 - 20/7/11 at 06:56 PM

newbie question whats the difference between 3.61 to a 4.1 anyway.

adithorp - 20/7/11 at 07:06 PM

quote:
Originally posted by Kev36
newbie question whats the difference between 3.61 to a 4.1 anyway.


One does 3.61 turns of the input shaft (prop) for one turn of the output shafts (halfshaft/driveshaft/wheel). The other does 4.01... In other words a 4.01 is lower geared and revs higher for a given speed.

[Edited on 20/7/11 by adithorp]

Kev36 - 20/7/11 at 07:20 PM

thanks , so for economic motorway driving, diffs in the low 3s are best?

daniel mason - 20/7/11 at 07:43 PM

depends what engine your running kev! some engines would be a waste of time with a diff ratio in the low 3's

Kev36 - 20/7/11 at 08:00 PM

ive got a 1600 xflow , seems to rev high when doing 70. 5 gears type 9

sjmatthews - 20/7/11 at 08:56 PM

How many revs at 70?

Kev36 - 20/7/11 at 11:40 PM

the rev counter is a bit knackered it hovers between 3500 and 5500 back and forward,