gerg 10,871 Posted October 21, 2015 There is a setting you use by measuring the deflection of the caps with a dial gauge on a magnetic base, once you spread them that is. A couple of thou is about right (see specs). Another method is to measure the bearing drag of the carrier using a spring scale and some string wrapped around it. The required torque to spin the carrier is measured and compared to specs. By now you're probably thinking that it's all getting a bit technical... Well there's a reason why there are diff specialists. You could just put it together with new bearings but use the same shims that came out of it. Works for me. But you'll need a spreader if installing tight new bearings. Share this post Link to post Share on other sites
gerg 10,871 Posted October 21, 2015 Slight vibration on take-off: sounds tailshaft-related. Gear misalignment will be horribly noisy and whiney. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted October 21, 2015 thanks,i rang the local diff shop and he said did the open centre have the vibration and i said no,then he said check your pressures in the rear tyres make sure they are the same ,because you have a LSD now that sounds like a common complaint to him,so off i go to the servo and yep the back left was down a bit on the other one ,so after fixing the pressure it didnt vibrate at all ! 2 gerg and deankxf reacted to this Share this post Link to post Share on other sites
deankxf 20,288 Posted October 22, 2015 never heard of that, but have experienced noise from different diameter spare wheel being used breifly. intersting stuff Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted October 22, 2015 yeah this mob have been in the game for 30 years and im gunna drop the car off to get it all soughted out by the pro's ,he said for $650 you get all new bearings,LSD pulled apart and checked ? and 2nd hand set of what ever gears came out,and correctly shimmed and right ware pattern on the gears so i guess just get it done. Share this post Link to post Share on other sites
gerg 10,871 Posted October 22, 2015 Yeah best to do that. If you're not sure about what you're doing, it could cost you a lot more than that if it all turns to shit. Share this post Link to post Share on other sites
bear351c 10,270 Posted October 22, 2015 Sounds like Uni is cactus, Turn tailshaft 180*, and reinstall. (if vibration is still there) Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted October 26, 2015 I want to give this another go,just mainly to save money,i will pull it all out again and get new carrier bearings fitted,new wheel bearings,i have not touched the pinion at all ,so about $250-$300 for bearings and i will re install it all,at $650 plus what ever it needs which is gunna be a grand i will give it another shot. Share this post Link to post Share on other sites
deankxf 20,288 Posted October 26, 2015 I want to give this another go,just mainly to save money,i will pull it all out again and get new carrier bearings fitted,new wheel bearings,i have not touched the pinion at all ,so about $250-$300 for bearings and i will re install it all,at $650 plus what ever it needs which is gunna be a grand i will give it another shot. this is why most of the time i have just bought a diff with the ratio i wanted second hand. i had an XE ghia diff ratio changed to 3.45 due to the engineer wanting to keep ventilated disc brakes(otherwise i'd have just fitted an EB XR6 diff) and i had a 3.45 center done to a leaf spring diff due to not being able to find that ratio for sale(rarer combo)(in hindsight, 3.23 or 3.27 would be close enough) labour charges at $80+ hr and GST on top adds up fast Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted October 26, 2015 This is the only diff i have ever had to do work on,like you said just buy the complete ratio one to start off with,all the diffs i have bought have been perfect in the past just bolt em in and change the oil,but its a good learning curve about shims and mesh ect.... 1 deankxf reacted to this Share this post Link to post Share on other sites
Stu5766 394 Posted November 2, 2015 Deankdx, for future reference, you can get XH XR6 diff which are leaf spring & 3.45 ratio. Take your time chestnut, you will get there. I changed the ratio in my XD from 3.45 to a 3.9 while the diff was still bolted in the back of my XD. I carried out the required shiming of the pinion, swapped the crown wheel & pinion ( matched set ) & checked the mesh with bearing blue. Everyone said that it can't be done. I might have got lucky, but it dosnt wine, clunk or howl. Just not very driver friendly with a 3.9 behind a healthy 351 & toploader, but I can only blame myself for that. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 2, 2015 I just pulled it all out again,axles,centre, ect... only took 1 hour and half,on wed im dropping the LSD centre off at the diff shop and they are putting new carrier bearings and new wheel bearings,then i hope this will be sorted,i will try and find a cheap diff spreader ,i have the shims that came out but i think it might need a bit more preload on the new bearings,i could get the centre out with a couple of jults with a big crowbar,so i dont no if it was enough preload ? Share this post Link to post Share on other sites
Stu5766 394 Posted November 2, 2015 That's all it's taken to get out on the couple of BW diffs I have played with. You don't want to much preload. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 2, 2015 ok cant wait until the test drive on saturday,do you put grease or oil on the new bearings ? or just fit 'em and thats it ? Share this post Link to post Share on other sites
Stu5766 394 Posted November 2, 2015 Oiling them won't hurt, but will make it slippery if you do it before fitting the hemisphere. I personally fill the diff with oil & rotate the wheels by hand to get everything rotating & oil through the bearings & recheck the oil. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 2, 2015 I see what you mean,good idea,i will do that then take it for small drive around the block,hopefully the noise will be gone and then check the oil again on the diff. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 5, 2015 I picked up the carrier and axles,new bearings ,i fitted them allready and noticed the shims were harder to install this time,so i guess a bit more preload,thats good. Share this post Link to post Share on other sites
Thom 6,651 Posted November 5, 2015 Did you check the pinion bearing while you had ir apart? Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 5, 2015 nope,i figured just leave it,the diff shop guy went for a spin in the car and said its just carrier making the noise so i got the wheel bearings done to,i wasnt going to spend massive money they quoted so i just wanted to give it a go myself,now i see why a 9 '' carrier is so easy because the whole centre just comes out ,not like the b/w but its good having a go yourself. Share this post Link to post Share on other sites
Stu5766 394 Posted November 5, 2015 How did you fit the bearing retainers on the axles?? I hope you didn't use an oxy. I knew of a wanker who calls himself a mechanic. Used an oxy to fit the bearing retainers. Axle slid out of the housing whilst going around a corner. Made a mess of the rear quarter on an XW. 1 gerg reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted November 5, 2015 I picked up the carrier and axles,new bearings ,i fitted them allready and noticed the shims were harder to install this time,so i guess a bit more preload,thats good. Good thing you didn't have to hammer the shit out of the shims to get them in (I assume). I've heard of someone smashing a shim trying that. Did you check backlash and/or tooth contact? Doesn't have to be perfect but if it's way out, that's another noise created. I just use a bit of spray paint on the crown teeth and wind it over a few times back and forth to see the tooth pattern. 2 Stu5766 and winton reacted to this Share this post Link to post Share on other sites
Stu5766 394 Posted November 5, 2015 I used bearing blue, but same sort of deal gerg. 1 gerg reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 6, 2015 what is the bearing retainer ? i just got the diff shop to install the gear,and i fit it. Share this post Link to post Share on other sites
Stu5766 394 Posted November 6, 2015 The retainer is the ring that sits behind the axle bearing. They would have pressed it on. Share this post Link to post Share on other sites
CHESTNUTXE 7,311 Posted November 6, 2015 yup you can see that in the picture,im going out to the garage now to put the brakes back on and the diff cover. Share this post Link to post Share on other sites
