p.mole1 Posted January 3, 2019 Share Posted January 3, 2019 I have managed to get hold of a cheap Quaife ATB and a spare Serria 3.6 diff. Is it possible to fit a LSD without specialist tools? Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 3, 2019 Share Posted January 3, 2019 I think I have a pdf manual somewhere. If you PM your email I’ll send it over laterIan Link to comment Share on other sites More sharing options...
p.mole1 Posted January 3, 2019 Author Share Posted January 3, 2019 Many thanks I have sent you my email Link to comment Share on other sites More sharing options...
p.mole1 Posted January 4, 2019 Author Share Posted January 4, 2019 Does anyone know where I can get hold of the tool to remove the bearing pre-load retainers, the threaded castelled nut things. Link to comment Share on other sites More sharing options...
Rob D. Posted January 4, 2019 Share Posted January 4, 2019 https://www.ebay.co.uk/b/Differentials-Parts-/33731 Link to comment Share on other sites More sharing options...
p.mole1 Posted January 6, 2019 Author Share Posted January 6, 2019 Hi Rob thanks got the tool and found the paint for the tooth contact. Link to comment Share on other sites More sharing options...
p.mole1 Posted January 6, 2019 Author Share Posted January 6, 2019 I have a 6 speed box and my car has a 3.9 diff with 14 inch wheel and gives around 16 mph per 1000 rpm and it seems to pull 6 th gear easily on track days. I was going to use a 3.6 diff with my LSD but I not sure if this spoil the top gear acceleration by much. I think the 3.6 diff will give around 18 mph per 1000 rpm so not a large increase.On the road the gears are ridiculous I can pull away in 3 rd gear. When I have finished with the engine I hoping for maximum power at around 7000 rpm so that would give a theoretical top speed of around 126 mph does that sound over geaded? Link to comment Share on other sites More sharing options...
rptruman Posted January 11, 2019 Share Posted January 11, 2019 Hello Wrightpayne,I’m looking to replace my very noisy LSD with something a little quieter. Could I also have a copy of the manual please?Thank you. Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 12, 2019 Share Posted January 12, 2019 Rptruman,Yes of course - if you send me a private message with your email address I'll send it over.RegardsIan Link to comment Share on other sites More sharing options...
p.mole1 Posted January 19, 2019 Author Share Posted January 19, 2019 Any gearbox experts out there.I have the the crown wheel built up and ready, I know how to measure the gear backlash and pinion contact but I can't seem how to fathom out the bearing pre-load? .Also I'm not sure what oil to use, it's an ATB diff so their aren't any friction plates, EP90 GL5 ? there are a lot of gears inside these diffs. Link to comment Share on other sites More sharing options...
Bricol Posted January 19, 2019 Share Posted January 19, 2019 Which preload - on the diff or the pinion?All the diffs I've played with, which hasn't included the Sierra yet, measure the spread of the bearing supports either side of the diff? Link to comment Share on other sites More sharing options...
p.mole1 Posted January 19, 2019 Author Share Posted January 19, 2019 Just the diff I haven't touched the pinion, if the tooth contact is out I will have to send it away as it's beyond my capabilities. Link to comment Share on other sites More sharing options...
SM25T Posted January 20, 2019 Share Posted January 20, 2019 I recently refilled my diff (with Quaife LSD) with Castrol B373 oil. Link to comment Share on other sites More sharing options...
TRP Posted January 20, 2019 Share Posted January 20, 2019 The preload on the crown wheel bearings is set by turning one bearing housings 4 castellation teeth further on one side (make sure you preload the correct housing). This will then alter the backlash which if set correctly before preloading the bearings will now be within spec. I’ve seen people in the past post that the backlash in a Sierra diff has to be 0.01mm, this is incorrect and if you set your final backlash this tight it will undoubtedly destroy your diff. I seem to remember the final backlash should be something like 0.12mm. Also measure this in at least three points around the crown wheel incase you have excessive run out. Link to comment Share on other sites More sharing options...
p.mole1 Posted January 21, 2019 Author Share Posted January 21, 2019 Great, thanks that makes sense. I was worried I would not be able to get the old bearing races out of the housings as they seemed a very tight fit. I waited till my wife was out then put them in the oven at 120 degrees and the races just about fell out. Link to comment Share on other sites More sharing options...
p.mole1 Posted January 21, 2019 Author Share Posted January 21, 2019 I have checked the Castrol 373 and it states it is for cars with LSD's. Technically the Quaife is not a LSD it has no friction plates just gears although I don't suppose it really matters? Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 21, 2019 Share Posted January 21, 2019 I just use the oil suitable for the sierra diff - currently have ford ranger oil in mine! Link to comment Share on other sites More sharing options...
p.mole1 Posted January 21, 2019 Author Share Posted January 21, 2019 Great thanks I'll pay a visit to the Ford dealers, EP 90 is very hard to get hold of! Link to comment Share on other sites More sharing options...
ECR Posted January 21, 2019 Share Posted January 21, 2019 From Quaiffe Feb 2009: Please use either the standard oil as recommended by the manufacturer of your vehicle or Silkolene Silktran Syn 5 (Fully synthetic API GL4/5 SAE 75W/90). Link to comment Share on other sites More sharing options...
p.mole1 Posted January 26, 2019 Author Share Posted January 26, 2019 How the hell do yo get the crown wheel and ATB back in, I've tried for about an hour and it's not going back in, no way!I Link to comment Share on other sites More sharing options...
Bricol Posted January 26, 2019 Share Posted January 26, 2019 You might need to give a little more info . . Diff upright . . . lower diff in, non-CW end first, into output shaft opening, lower other side, engage CW with pinion, let it rotate as you lower it in . . wind cups in from either side ? How did it come out . . . reverse it . . . Link to comment Share on other sites More sharing options...
p.mole1 Posted January 26, 2019 Author Share Posted January 26, 2019 I think it may be the fact that I am using an ATB Quaife diff. It is too large to fit back in!It is not even close to fitting back into the housing? Link to comment Share on other sites More sharing options...
EEK Posted January 26, 2019 Share Posted January 26, 2019 You sure you're not trying to get a 7.5 diff into a 7" casing? Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted January 26, 2019 Area Representative Share Posted January 26, 2019 p.mole1,Have you ground any material out of the inside of the casting anywhere?I recall "TRP" grinding quite a bit out of his casting to replace his open diff with a ZF LSD. Link to comment Share on other sites More sharing options...
TRP Posted January 26, 2019 Share Posted January 26, 2019 I’d guess the Quaife ATB is dimensionally similar to my ZF so you will need to remove some material from the sides of the casing where the back plate goes on. I seem to remember shaving something like 5mm off. Link to comment Share on other sites More sharing options...
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