Wez Posted January 6, 2010 Share Posted January 6, 2010 Hey All, Maybe a stupid question but I have searched without success. If I wanted to change to the NA/Auto final drive ratio from my large TT TRD diff would I also need to buy a new TRD unit or does everything else around it change? My diff code is B03B and I have a TRD diff fitted. Crown Wheel Size: A (8'' - 203mm), B (8.7'' - 221mm) Differential Ratio: 01 (4.083:1), 02 (3.769:1), 03 (3.267:1) Differential Type: A (Standard open differential), B (Torsen LSD) Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 7, 2010 Share Posted January 7, 2010 Yes, you would need a different LSD assembly as the LSD part supports the crown wheel, and the bolt PCD's are different. Link to comment Share on other sites More sharing options...
Wez Posted January 7, 2010 Author Share Posted January 7, 2010 As I have an NA auto sat here am I correct in assuming I have everything needed to swap them over but would then require a new TRD diff for the auto casing. Link to comment Share on other sites More sharing options...
Nic Posted January 7, 2010 Share Posted January 7, 2010 You'll also need the drive shafts to fit the other diff. Link to comment Share on other sites More sharing options...
TLicense Posted January 7, 2010 Share Posted January 7, 2010 I think what Wez is looking to do is to swap the ring and pinion gears over from the NA to the TT diff in order to change the final ratio. The question is, will just the gears swap over? This way he should be able to keep everything else that he has the same... Link to comment Share on other sites More sharing options...
Nic Posted January 7, 2010 Share Posted January 7, 2010 The question is, will just the gears swap over? Basically no, Wes has the larger early model 6spd 2JZGTE diff fitted which has a larger diameter crown wheel (221mm), compared to all other models which were fitted with the smaller diff/crown wheel (203mm). Link to comment Share on other sites More sharing options...
TLicense Posted January 7, 2010 Share Posted January 7, 2010 I wasn't sure if that was the internal diameter of the gear, or the diameter at which the pinion gear mated with it or something else. I've not had a look at how the crown ring actually bolts to the diff so wasn't sure if the smaller one would just fit onto it. Link to comment Share on other sites More sharing options...
Wez Posted January 7, 2010 Author Share Posted January 7, 2010 Basically no, Wes has the larger early model 6spd 2JZGTE diff fitted which has a larger diameter crown wheel (221mm), compared to all other models which were fitted with the smaller diff/crown wheel (203mm). Nic do you know what diffs are available for the smaller NA auto casing, ie TRD, Kaaz, Cusco etc? Link to comment Share on other sites More sharing options...
Nic Posted January 7, 2010 Share Posted January 7, 2010 Nic do you know what diffs are available for the smaller NA auto casing, ie TRD, Kaaz, Cusco etc? TRD, Kaaz, Cusco and ATS all do LSD's to fit the smaller casing. Link to comment Share on other sites More sharing options...
Wez Posted January 7, 2010 Author Share Posted January 7, 2010 Top stuff thanks Link to comment Share on other sites More sharing options...
Wez Posted January 7, 2010 Author Share Posted January 7, 2010 TRD, Kaaz, Cusco and ATS all do LSD's to fit the smaller casing. To add to the list there is also OS Giken and Carbonetic units available, quite a lot of choice really Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 8, 2010 Share Posted January 8, 2010 The OS Giken ones are superb, but costly. I can do a bit of discount on Giken stuff though, if you decide to take the plunge I can also do full spares back up on them, too, which is something to consider. Link to comment Share on other sites More sharing options...
Nic Posted January 8, 2010 Share Posted January 8, 2010 I'd forgotten about OS Giken, they, Cusco, Kaaz and ATS are all similarly priced, surprisingly the TRD LSD is a fair bit cheaper. TRD and ATS I know do rebuild parts, not sure about the others. Link to comment Share on other sites More sharing options...
Wez Posted January 8, 2010 Author Share Posted January 8, 2010 Chris & Nic, any chance of putting some prices up here? Link to comment Share on other sites More sharing options...
Nic Posted January 8, 2010 Share Posted January 8, 2010 Sorry Wes I'm not trading at the moment. If you have a look at the links above you'll find the Japanese Yen prices to compare each, think you'll find the TRD LSD to be the cheapest and easiest to get hold of. Link to comment Share on other sites More sharing options...
JamieP Posted January 8, 2010 Share Posted January 8, 2010 If you dont fancy wasting a trd diff on the na i will buy it from you and give you a diff in exchange plus cash, i have many diffs mate. Link to comment Share on other sites More sharing options...
Wez Posted January 14, 2010 Author Share Posted January 14, 2010 OK I have managed to source a diff from here http://www.mkivsupra.net/vbb/showthread.php?t=206979 What else do I need to swap this over, is it just the drive shafts? Link to comment Share on other sites More sharing options...
Wez Posted January 14, 2010 Author Share Posted January 14, 2010 Anyone? Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 14, 2010 Share Posted January 14, 2010 Is the back 1/2 of the propshaft the same? Nic is the expert on these diff swaps Link to comment Share on other sites More sharing options...
JamieP Posted January 14, 2010 Share Posted January 14, 2010 Na diff is not a direct fit on a tt mate. Donut is different as is the bolt spacing to the prop which means you also need a na prop, better to use a tt diff for the swap. Link to comment Share on other sites More sharing options...
Wez Posted January 14, 2010 Author Share Posted January 14, 2010 I guess that means I will need the drive shafts and prop then Link to comment Share on other sites More sharing options...
Homer Posted January 14, 2010 Share Posted January 14, 2010 I guess that means I will need the drive shafts and prop then I am pretty certain the driveshafts are the same between the NA and TT non-early-6spd. I've fitted a mixture of TT and NA driveshafts over the last year to mine with the NA diff, there was no difference in fitment. The prop sounds like another matter though as Jamie said (didn't know that until recently!) Link to comment Share on other sites More sharing options...
Wez Posted January 14, 2010 Author Share Posted January 14, 2010 I am pretty certain the driveshafts are the same between the NA and TT non-early-6spd. I've fitted a mixture of TT and NA driveshafts over the last year to mine with the NA diff, there was no difference in fitment. The prop sounds like another matter though as Jamie said (didn't know that until recently!) My TT has the larger diff casing which I think is different Link to comment Share on other sites More sharing options...
David P Posted January 14, 2010 Share Posted January 14, 2010 This might be useful info. http://www.soarerworld.com/forum/showthread.php?t=27570 Link to comment Share on other sites More sharing options...
Wez Posted January 19, 2010 Author Share Posted January 19, 2010 This might be useful info. http://www.soarerworld.com/forum/showthread.php?t=27570 Thanks Link to comment Share on other sites More sharing options...
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