DaveR Posted August 29, 2013 Share Posted August 29, 2013 I've paid a deposit for an OS Giken 1.5 way LSD through TDI in Essex. Despite the fact that there seems to be only 4 different types of diff' for all Supra models (link here), only 2 of which apply to a turbo'd Mk4 and that I've sent all of the details of my car from my VIN plate, OS Giken are saying they need a number of different measurements before they can spec the correct one and send it to me... Since removing my diff to take these measurements isn't a five minute job and the whole point of pre-ordering like I have was so I didn't have my car off the road for ages, I'm hoping someone on here has access to the relevant measurements of my stock B03B torsen LSD... The measurements I need are shown on this diagram and explained in the box on the top right of the image (I've already sent through the various vehicle details thy've asked for in the other box): PLEASE HELP!! Quote Link to comment Share on other sites More sharing options...
DaveR Posted September 1, 2013 Author Share Posted September 1, 2013 Seriously... Anyone? Quote Link to comment Share on other sites More sharing options...
Slutters Posted September 1, 2013 Share Posted September 1, 2013 Speak to Sam at TDI mate, I am sure he can help you. Quote Link to comment Share on other sites More sharing options...
DaveR Posted September 1, 2013 Author Share Posted September 1, 2013 Speak to Sam at TDI mate, I am sure he can help you. It's the staff at TDI who have forwarded the diagram on to me to try and find the info because they don't have it. Clearly they could very easily take my car, strip the diff off and measure everything but we're all keen to avoid that - it would then be another two weeks until the OSG one is delivered during which either I'm without my car and TDI have to store it, immobile and taking up a ramp and / or workshop space OR they have to put it all back together just to take it apart again when the new parts arrive. I don't want that! Quote Link to comment Share on other sites More sharing options...
Dnk Posted September 1, 2013 Share Posted September 1, 2013 Are there no engineering shops near you that could do the measurements for you ? Looks pretty straight forward to me if they had a cnm machine and take under 1 hr to do Quote Link to comment Share on other sites More sharing options...
DaveR Posted September 1, 2013 Author Share Posted September 1, 2013 Are there no engineering shops near you that could do the measurements for you ? Looks pretty straight forward to me if they had a cnm machine and take under 1 hr to do It would need stripping though surely? Quote Link to comment Share on other sites More sharing options...
Dnk Posted September 2, 2013 Share Posted September 2, 2013 It would need stripping though surely? Yes sorry i skim read your post a tad, you'd need to take the diff out the casing and remove a few parts but not necessarily a total strip Quote Link to comment Share on other sites More sharing options...
Guest Roger NE Posted September 2, 2013 Share Posted September 2, 2013 (edited) Personally I can't understand WHY they want these dimensions? If you're buying a complete new Diff from them to fit your Supra, the internal dimensions of parts of your current one are surely irrelevant? As long as the external dimensions are correct, such that it bolts to the Sub-frame, flywheel and drive shafts correctly, that's surely all that matters? If they OFFER diffs for Supras, you'd think they'd either have those dimensions, or at least have a scrap old Diff to match the external dimensions. (unless they have never supplied one to anyone before) I agree with you, I certainly wouldn't be doing all that work for them ! When you buy a new Reconditioned gearbox (as I have a few times for different cars over the years), they don't ask you to strip yours and measure everything, they have all the correct spec already. Edited September 2, 2013 by Roger NE (see edit history) Quote Link to comment Share on other sites More sharing options...
DaveR Posted September 2, 2013 Author Share Posted September 2, 2013 Yes sorry i skim read your post a tad, you'd need to take the diff out the casing and remove a few parts but not necessarily a total strip Gotcha. Still something I'm keen to avoid if I can, but it looks like I may have to go down this route... Personally I can't understand WHY they want these dimensions? If you're buying a complete new Diff from them to fit your Supra, the internal dimensions of parts of your current one are surely irrelevant? As long as the external dimensions are correct, such that it bolts to the Sub-frame, flywheel and drive shafts correctly, that's surely all that matters? If they OFFER diffs for Supras, you'd think they'd either have those dimensions, or at least have a scrap old Diff to match the external dimensions. (unless they have never supplied one to anyone before) I agree with you, I certainly wouldn't be doing all that work for them ! When you buy a new Reconditioned gearbox (as I have a few times for different cars over the years), they don't ask you to strip yours and measure everything, they have all the correct spec already. You know what? Me too! There're two options specified on the website, the difference being the length of driveshaft only, which I know from my VIN plate. Why anything else is relevant is anyone's guess... Quote Link to comment Share on other sites More sharing options...
Justin Bieber Posted September 2, 2013 Share Posted September 2, 2013 http://www.injectedperformance.com/osgiken/osgikensuperlocklsdforsupra.htm Hope this helps: Two variations are available: * 8.5" Rear End, fits 5MT or AT * 9" Rear End, fits 6MT, but requires modification to the side flange Quote Link to comment Share on other sites More sharing options...
DaveR Posted September 3, 2013 Author Share Posted September 3, 2013 http://www.injectedperformance.com/osgiken/osgikensuperlocklsdforsupra.htm Hope this helps: Two variations are available: * 8.5" Rear End, fits 5MT or AT * 9" Rear End, fits 6MT, but requires modification to the side flange You would think, wouldn't you? But it's actually OS Giken that are asking for this info not TDI as the supplier. This is why I'm a bit baffled about it because surely it's either one or the other...? Quote Link to comment Share on other sites More sharing options...
Justin Bieber Posted September 3, 2013 Share Posted September 3, 2013 Are you a member of Supraforums mate? OS Giken are a lot more popular over there, someone must have the measurements there! Quote Link to comment Share on other sites More sharing options...
Jellybean Posted September 4, 2013 Share Posted September 4, 2013 Might be useful info for you Interesting OsGiken Install Issues http://www.supraforums.com/forum/showthread.php?693386-OS-Gilken-Diff&highlight=osgiken+LSD+install This has to do with proper installation of the OS Giken Super Lock LSD and a mod that is apparently required for some JZA80 diffs to make it fit right, but it's not clear to me what diffs need this mod. On their site http://www.osgiken.net/techcenter.php Long story short, the actual axle stubs that Toyota used with these differentials have a surprising amount of variety, considering the consistencies everywhere else in the car. For instance, when installing a clutch type LSD in a Supra or Soarer that came with the 200mm diff and a factory LSD, the axle stubs from LSD-equipped cars are slightly too long for a proper fit with a TRD or other clutch type LSD. For the most part, this is usually taken up by tolerance creep between parts and no problems are experienced, and the tension from the installed axle halfshafts themselves usually keeps the axle stubs in place, but this sometimes becomes problematic when wheelhop, etc, is experienced and the axle stubs actually pop out just enough to induce a gear oil leak, and because of that possibility, many LSD makers list a need for the factory Toyota OPEN differential axle stubs to be used when installing a clutch type LSD. Since the 220mm diff as found in the pre-'minor change' JDM 6-spd TT models (which includes ALL of the US TT 6-spd's and European delivered TT big diff vehicles, I should mention) always came with a Torsen LSD, the axle stubs are also slightly longer than would be used with most clutch type LSD's. The TRD LSD was probably designed to accommodate those stock axles, but because of possible fitment issues, OS Giken has published this just in case a tolerance issue arises and those axles have occasion or cause to pop out under wheelhop conditions, etc. As long as your LSD is working normally and no leaks or problems with the axle stubs popping out has been experienced, I'd say you're probably just fine. But if you go back into the diff for any other reason, probably wouldn't be a bad idea to take the stubs to get milled down as shown in the pics to ensure that it never becomes a problem later on. Cliffs: If you've got a clutch type LSD in a 220mm diff, and you're experiencing an issue where the axle stubs pop out after hard launches, high speed pulls, or after wheelhop, and thus cause an oil leak, pull both axle stubs and have them milled in accordance with the pictures. The TRD LSD was probably designed to accommodate the stock axle stubs though. If you're installing an OS Giken Super lock into a 220mm diff, you might as well have your axles modified 'while you're in there' during the installation. The modified axles will not affect the stock torsen LSD should you chose to revert to the OEM Torsen for any reason. OsGiken Super Lock LSD **Not too sure if the output shafts are modified? Output Shafts: http://www.rhdjapan.com/toyota-oem-differential-output-shaft-24020-aristo-supra-soarer-60904 LSD: http://www.rhdjapan.com/os-giken-1-5-way-super-lock-lsd-spec-s-jza80-jzz30-jzz31-uzz30-60873 Brand: OS Giken Product: Super Lock LSD Spec-S 1.5 Way JZA80 JZZ30 JZZ31 UZZ30 Part Number: D-TD102061405-S PRODUCT NOTES: - Required for all vehicles: Toyota OEM Output Shaft (41309-24020) x2 needed for installation COMPATIBILITY NOTES: - JZA80: Only for Vehicles before 5/96 Interesting On http://www.osgiken-jp.com/eng/products/superlock.html Part Number: D-TD102061405-S notes except '93/5 to '96/5 6spd According to Whifbitz website http://www.garagewhifbitz.co.uk/index.php/os-giken-lsd.html http://www.garagewhifbitz.co.uk/index.php/toyota-differential-side-shaft.html Toyota Differential Side Shaft for 6 speed 1993-1996 cars. Used on auto and VVTi cars when fitting an aftermarket LSD, not required on 1993-1996 6 speed cars though. Quote Link to comment Share on other sites More sharing options...
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