1997 Hilux LN167R IFS Front Differential Torque settings, Crown wheel, Carrier bearings etc

get the workshop manual or go see a diff repair shop
depending on the make of diff
some pinions are measured by a preload as the bearing spacer collapses to a set distance to give that preload
others have a solid spacer to get the setting
with the side bearings it is a preload measured at the crown wheel
everything is explained in the workshop manual

all differentials are all set to the same specifications as to pinion bearing preload , carrier bearing preloads and back lash between the crown wheel and pinion
the contact pattern is always the same as is the torque measurement of the drown wheel to carrier bolts
so any workshop manual that has a differential repair section will have what you want
find yourself a ford workshop manual and follow the section as to rebuilding a diff
Note --the pinion will have a + or - measurement on the end and that denotes the thickness of the spacer under the pinion between the pinion and the bearing inner race
you will have to get that right or the contact pattern will be out
3.7 ration is in utes or station wagons so it may be simpler to get one out of that vehicle and re-race it as all you will need then is new bearings and a collapsable spacer and a good tension wrench and a spring balance to get the pinion bearing preload correct

remove the axles, undo the back plates from the housing. remove the diff carrier bolts . take care to keep shims to the same side of the bearings. pull the diff centre out. remove crown wheel from the diff carrier . fir crown wheel to the new diff carrier (limited slip centre) . Refit carrier into diff housing. Best advice --have an accredited diff shop do the job for trouble free operation.

time to pull the diff centre as the noise is from incorrect positioning of the crown wheel and pinion. This happens from failed pinion bearings or side carrier bearings.. Could be lack of oil or the wrong oil if it is a limited slip diff.

Here's a link to your front suspension,you will need to join their site to see,it's free. Repair Guides 4wd Front Suspension 4wd Front Suspension AutoZone com

If you are talking the crown wheel carrier bearings in a differential then the cost to repair is 4 bearings and a pinion seal kit. The cost will come in if the ring gear and pinion teeth have been damaged. I suggest a second opinion from an accredired transmission specialst that does differentials

Adjustment to crown wheel and pinion has to be done after bearing replacement on the pinion and carrier. It is a method that unless you have done a lot of diff repairs will amount to a trial and error procedure to get it right. Fortunately any work shop manual that you can borrow will have the way to set up the diff and there will be photos and directions on which to move to get the setting right. It is important to get the reading right as correct gear mesh will ensure a long lasting quite diff operation.

A howling noise from a diff is an indication of the gear mesh( pinion to crown wheel) is not correct. Several reasons being worn pinion bearings--loss of preload on the pinion bearings --- crown wheel carrier bearings failing ---not sufficient preload on the bearings---wear on the teeth from incorrect diff oil in use. or simply wrong diff oil. The grade should be 80w90 OEP for normal or special oil for limited slip diffs.

Specifically which torque settings are you referring to. There are thousands to choose from. Please give an example such as "differential carrier", "cylinder head", "exhaust manifold to engine block" etc.

Depends on 2wd or 4wd, type of hub, friction, etc.
Here is a description of one:

http://www.hilux4x4.co.za/simon/overhaul_front_axle/front_axle_3.php

Here is another that says to adjust based on rotation drag:

http://www.4x4community.co.za/forum/showthread.php?t=7131