Guest Garfy Posted January 11, 2010 Share Posted January 11, 2010 I will be swapping my diff over this weekend, (I hope) and I've noticed that the bolts that secure it to the rear subframe are allen key type, I will need to purchase the correct size for this, so does anyone know what size it is? thanks Garath Quote Link to comment Share on other sites More sharing options...
spartan Posted January 11, 2010 Share Posted January 11, 2010 I think it's 12mm - see from page 66 onwards in the service/repair guide here. Hope that helps. Let us know how it goes - I've got a Torsen unit sat in my garage that's been waiting to go on the car for over a year, I just haven't had the courage to do it myself! Quote Link to comment Share on other sites More sharing options...
Guest Garfy Posted January 11, 2010 Share Posted January 11, 2010 Excellent, thanks fella Quote Link to comment Share on other sites More sharing options...
Terminator Posted January 14, 2010 Share Posted January 14, 2010 Don't forget the bolts that hold the diff to the subframe are stretch bolts, so one use only and according to Toyota should be replaced Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted January 14, 2010 Share Posted January 14, 2010 Right enough, so are the two that connect to the subframe further towards the front of the car. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 14, 2010 Share Posted January 14, 2010 Don't forget the bolts that hold the diff to the subframe are stretch bolts, so one use only and according to Toyota should be replaced Right enough, so are the two that connect to the subframe further towards the front of the car. Borracks Didn't know this... Yet another order heading Mr T's way! Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted January 14, 2010 Share Posted January 14, 2010 (edited) If you are using the same Toyota service manual PDF that I have, if you go to page 63/111 you will notice the 'Non-reusable part' star is not present like it is on the other diagram pages, rather it is just an empty space. You can still highlight the space where it should be however and if you highlight the whole page's text you can see what is meant to have the little star next to it. If someone else could confirm that star's missing on theirs and it's not just mine that would be great. Edited January 14, 2010 by TTRickeh (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted January 14, 2010 Share Posted January 14, 2010 If you are using the same Toyota service manual PDF that I have, if you go to page 63/111 you will notice the 'Non-reusable part' star is not present like it is on the other diagram pages, rather it is just an empty space. You can still highlight the space where it should be however and if you highlight the whole page's text you can see what is meant to have the little star next to it. If someone else could confirm that star's missing on theirs and it's not just mine that would be great. Just checked the full Toyota service manual and on SA-86 it has all 4/5 bolts listed as non-reusable. Annoyed at myself that I missed this... Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted January 15, 2010 Share Posted January 15, 2010 Just checked the full Toyota service manual and on SA-86 it has all 4/5 bolts listed as non-reusable. Annoyed at myself that I missed this... Me too, I only just realised after Terminator said and I went to double check the manual and realised the star was missing. Back to Toyota it is then... I guess we have different manuals, the diagram I am talking about is on SA-63, and on SA-86 there's no mention of re-usable parts on mine it's more the internals of the diff. They are not the hardest bolts to get at it could be worse Quote Link to comment Share on other sites More sharing options...
spartan Posted January 15, 2010 Share Posted January 15, 2010 (edited) If you are using the same Toyota service manual PDF that I have, if you go to page 63/111 you will notice the 'Non-reusable part' star is not present like it is on the other diagram pages, rather it is just an empty space. You can still highlight the space where it should be however and if you highlight the whole page's text you can see what is meant to have the little star next to it. If someone else could confirm that star's missing on theirs and it's not just mine that would be great. It took me a while to understand what you meant but I got there in the end (on other diagram pages, there is a black star/diamond next to the words "Non-reusable part" in the bottom corner; on this diagram the words are there but the mark is missing but if you click and drag across the text from top-left to bottom right, you see a little highlighted 'space' next to the words and also next to some of the part numbers!) - very well spotted! Part numbers are (to be confirmed - the last two digits indicate the quantity): 90110-14003-01 "BOLT, NO.2 (FOR REAR DIFFERENTIAL CARRIER SET)" 90110-14003-02 "BOLT, NO.3 (FOR REAR DIFFERENTIAL CARRIER SET)" 90105-12218-02 "BOLT, NO.4 (FOR REAR DIFFERENTIAL CARRIER SET)" N.B. these are the part numbers and descriptions for the JDM model; the part numbers for the Euro. model are the same but the description of 90105-12218-02 changes to "BOLT, NO.1 (FOR REAR DIFFERENTIAL CARRIER SET)" Also, 90110-14003 seems to have been superseded by 90110-14007 "BOLT, HEXAGON SOCKET" - three (3) of these required in total. Incidentally, according to the service manuals for the prop. shaft (here), you're meant to re-check the joint angle when doing things like replacing the diff (see PR-15 onwards). This requires adjusting shims, special tools and generally looks 'nasty'. Is it really necessary? Edited January 15, 2010 by spartan Footnote! (see edit history) Quote Link to comment Share on other sites More sharing options...
dude Posted January 15, 2010 Share Posted January 15, 2010 Feck me if I replaced mine each time I had the diff out it would cost more than the fuel!!! Quote Link to comment Share on other sites More sharing options...
Terminator Posted January 16, 2010 Share Posted January 16, 2010 (edited) I only mentioned it because I remember ordering some when I swapped my diff for and LSD , as I wanted to do things by the book, that was about 8 years ago. The new ones arrived too late, so I reused the originals, I could not be bothered with changing them, so still have the ones I ordered. They have always been tight when I checked the torque settings. As I have a torque level way above stock, I would have thought they would have given up by now if they were going to. If I recall it was the casing on Dudes diff that gave out on the strip not any of his reused diff bolts. Edited January 16, 2010 by Terminator (see edit history) Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 16, 2010 Share Posted January 16, 2010 feck me if i replaced mine each time i had the diff out it would cost more than the fuel!!! Quote Link to comment Share on other sites More sharing options...
Homer Posted January 16, 2010 Share Posted January 16, 2010 Feck me if I replaced mine each time I had the diff out it would cost more than the fuel!!! dude you are not wrong! Got a price back on a set from Toyota - £64 I'm still using some of the bolts you had on the car and even after a year they didn't need any tightening. Not that the car has had any use.... Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 16, 2010 Share Posted January 16, 2010 Worth fitting new bolts or not then? Lee is fitting my new TRD diff next week and he was gonna order the bolts monday. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 16, 2010 Share Posted January 16, 2010 Worth fitting new bolts or not then? Lee is fitting my new TRD diff next week and he was gonna order the bolts monday. With the amount of money invested in your car it's small fry, so probably worth doing just for reliabilty and safetys sake. Especially so with the hard use it'll get and that the new diff is going to put a lot more pressure on the mounts. Otherwise, no idea... Would like to see what others think. Quote Link to comment Share on other sites More sharing options...
Neil-NA Posted January 17, 2010 Share Posted January 17, 2010 Will the NA use stretch bolts too? Quote Link to comment Share on other sites More sharing options...
spartan Posted January 17, 2010 Share Posted January 17, 2010 dude you are not wrong! Got a price back on a set from Toyota - £64 That price is crazy - according to the site I use in the US, the price for all 5 bolts should be about $15 (or $10 after discount). Quote Link to comment Share on other sites More sharing options...
Kirk Posted January 17, 2010 Share Posted January 17, 2010 LOCTITE job done?? i cant see it doing to much harm if they never been out before... its when they be in and out loads of times id replace them £64 for a set. it cant be that much surely Quote Link to comment Share on other sites More sharing options...
Guest Garfy Posted January 18, 2010 Share Posted January 18, 2010 well, I swaped the diff yesterday, I didn't change the bolts as i can't see any reason to, I will check them next weekend to see if they have worked loose, but I bet there are hundreds of supra's out there that have had the diff's changed without people even realising they are stretch bolts. oh, and changing the diff is an easy job, took me about 3 hours on the drive. Quote Link to comment Share on other sites More sharing options...
Terminator Posted January 18, 2010 Share Posted January 18, 2010 (edited) As a club we must point out what Toyota recommend, it would be irresponsible to do other wise. I think whether to change the diff bolts or not has to be an individuals decision based the research they do. There is evidence that the bolts are fine to used many times over, with torque levels through diffs many times that they were designed for. My reused bolts have been tight for 8 years, and handled auto BPU and now GT74 race engine six speed power levels through a triple place clutch. Dudes bolts bent but did not fail when he ripped his diff apart. I suspect in high power cars the diff internals will give out long before the bolts. £64 for five bolts sound way to high. It is 8 to 9 years ago but I am sure it was closer to £20 when I bought mine. As has been said even at £64, given the money people are willing to pay for other non essential parts, it is a small amount for peace of mind. I have a new set of bolts here so may be we could do some comparison measurements with some used bolts, just to see how much deformation actually takes place. Edited January 18, 2010 by Terminator (see edit history) Quote Link to comment Share on other sites More sharing options...
Neil-NA Posted January 18, 2010 Share Posted January 18, 2010 I'm just going to get some replacement bolts, just to be safe, i know its an NA but i dont want it falling off. The £64 needs double checking, surley they cant be that much. Quote Link to comment Share on other sites More sharing options...
Terminator Posted January 19, 2010 Share Posted January 19, 2010 Let us know how much you pay for them. Quote Link to comment Share on other sites More sharing options...
Neil-NA Posted January 25, 2010 Share Posted January 25, 2010 Sorry to bring this back up but Whifbitz do the bolts fairly cheap - http://www.mkivsupra.net/vbb/showthread.php?t=109403&page=26 Scroll down a bit. Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 25, 2010 Share Posted January 25, 2010 With the amount of money invested in your car it's small fry, so probably worth doing just for reliabilty and safetys sake. Especially so with the hard use it'll get and that the new diff is going to put a lot more pressure on the mounts. Otherwise, no idea... Would like to see what others think. We replaced all the bolts in the end, 5 in toal i think, 3 on the back of the diff and the 2 big bolts that hold it up. ill have to check with Lee on cost. Quote Link to comment Share on other sites More sharing options...
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