Scooter Posted August 17, 2020 Share Posted August 17, 2020 Does anyone know the measurements of the driveshaft bolt holes on a big diff? I have a small diff with 'oversize' flanges ie the small diff/normal driveshafts bolts don't match up, the flanges and its bolt holes being a larger diameter? I'm trying to ID the flanges basically so if anyone has a large case diff or driveshafts lying about I'd appreciate some measurements. (does a LS400 or anything use larger flanges?) Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted August 17, 2020 Share Posted August 17, 2020 Have a chat with Mr P, he will more than likely know or take a look at his transmission group. It’s bound to be in there Quote Link to comment Share on other sites More sharing options...
David P Posted August 17, 2020 Share Posted August 17, 2020 (edited) Yank-ism can degenerate this subject into confusion, because they call both types of shafts driveshafts. Diff prop-shaft flange. This comes in two different sizes, N/A Supra has the smaller size and all T.T. Supra's have the larger size, which has been all the info I have ever needed. I have never measured either but the larger one is around 10mm more between bolt holes. Diff drive-shaft flanges. These too come in two different sizes, but I have yet to identify which, where and why and have never measured the difference? Either/or, each flange is interchangeable from one diff to another. Edited August 17, 2020 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 17, 2020 Author Share Posted August 17, 2020 These too come in two different sizes, but I have yet to identify which, where and why and have never measured the difference? Either/or, each flange is interchangeable from one diff to the other. Cheers David, this is what I have the flanges are interchangeable, and look to be the same but are in fact similar to the prop flange the bolting is just bigger/wider. As the only driveshaft options I know of for the Supra are the prefacelift manual and large diff/shafts or the standard small diff/NA ones, I'd really appreciate it if someone does have larger diff they can measure flanges of. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted August 17, 2020 Share Posted August 17, 2020 Hi Scott, Just been out and took these pictures for you. The diff drive shaft flanges are from a large case diff (UK Spec). I can confirm these do fit UK Spec drive shafts. Quote Link to comment Share on other sites More sharing options...
David P Posted August 17, 2020 Share Posted August 17, 2020 (edited) That's a Pukka Tech answer that deserves to be in "Technical" as a rare resolved thread? I admit that I fancy stealing borrowing those pics for posterity in the Transmission Group. Edited August 17, 2020 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 17, 2020 Author Share Posted August 17, 2020 Ta Matt, top man I'll compare to mine! Quote Link to comment Share on other sites More sharing options...
David P Posted August 17, 2020 Share Posted August 17, 2020 (edited) Cheers David, this is what I have the flanges are interchangeable, and look to be the same but are in fact similar to the prop flange the bolting is just bigger/wider. As the only driveshaft options I know of for the Supra are the prefacelift manual and large diff/shafts or the standard small diff/NA ones, I'd really appreciate it if someone does have larger diff they can measure flanges of. I can't remember who's Supra it was, yet once came across a small-case Torsen diff that had the larger sized driveshaft flanges, which didn't pair up to the driveshafts in the Supra that it was going into, so I just swapped the flanges with/from the small-case open diff that had just been taken out. After which, I never got around to wondering about this enough to inspire my Nerd instinct into researching as to why? Even-so, this does reveal that larger driveshaft flanges are not exclusive to large-case diffs. Edited August 17, 2020 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 17, 2020 Author Share Posted August 17, 2020 Looks like they are indeed the larger ones I have, thanks Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 17, 2020 Author Share Posted August 17, 2020 I can't remember who's Supra it was, yet once came across a small-case Torsen diff that had the larger sized driveshaft flanges, which didn't pair up to the driveshafts in the Supra that it was going into, so I just swapped the flanges with/from the small-case open diff that had just been taken out. After which, I never got around to wondering about this enough to inspire my Nerd instinct into researching as to why? Even-so, this does reveal that larger driveshaft flanges are not exclusive to large-case diffs. yeah that's what I had to do. Someone is after the larger flanges and I could do with the normal/common ones to swap into mine (although I should 100% check first it's all the smaller fixings on mine after all this!) Cheers all Quote Link to comment Share on other sites More sharing options...
David P Posted August 17, 2020 Share Posted August 17, 2020 P.S. If it was diff prop-flange info & dimensions that you were after, there's a whole page about that in the Transmission Group. https://www.mkivsupra.net/vbb/group.php?discussionid=129&do=discuss Quote Link to comment Share on other sites More sharing options...
np89 Posted August 25, 2020 Share Posted August 25, 2020 (edited) please create a wanted thread for this - mods Edited August 26, 2020 by Gaz6002 rule break (see edit history) Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 25, 2020 Author Share Posted August 25, 2020 Hi, I am happy to let mine go but (and sorry to be a bit of an arse!) would want some small case ones sent to me first, if you or anyone can send them to me, covering the postage is all I ask. Quote Link to comment Share on other sites More sharing options...
np89 Posted August 25, 2020 Share Posted August 25, 2020 I'll send you a pm here Scooter, thanks Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 25, 2020 Author Share Posted August 25, 2020 Ok need some clarification.............will the large case flanges slot straight into a small case diff? I know the driveshafts are thicker diameter but are the flange spines (inside the diff) different? Quote Link to comment Share on other sites More sharing options...
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