dandan Posted July 21, 2012 Share Posted July 21, 2012 I know I could probably find this with a good search but could anyone please answer a few q's about swapping to a big diff? Do I need to swap both driveshafts or.just one? If it's one .......which one? Can I just swap half of a big diff prop onto my little diff prop or do I need to swap the whole thing? I'm removing the little.diff right now so any replies are hugely appreciated Thanks Dan Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 21, 2012 Share Posted July 21, 2012 I'm pretty sure it's just the passenger side that's shorter, I did read that they are different thickness an all so could be worth changing both, I'd not split the prop either as they are balanced. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 21, 2012 Share Posted July 21, 2012 Big difference in length. Quote Link to comment Share on other sites More sharing options...
Jos Posted July 21, 2012 Share Posted July 21, 2012 ^^ Is that not a right hand and a left hand driveshaft?, as far as I know the left big diff driveshaft is 5 mm shorter than the small diff, as stated in the manual, there are members on here who have fitted the small diff driveshaft on the big diff. If you compare the width of the small diff with the large diff you will find that the bigg diff is also 5 mm wider. I did post this same question some time ago, since I'm also swapping for a big diff, and got no real answers, but after measuring everything up I'm confident there is still enough play for the 5mm longer driveshaft to fit without issues. But I would also like to know other people's ideas about this Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 21, 2012 Share Posted July 21, 2012 Yeah they are both from a big diff car. Quote Link to comment Share on other sites More sharing options...
Jos Posted July 21, 2012 Share Posted July 21, 2012 Yeah they are both from a big diff car. Any chance you could please measure the shorter driveshaft as in this thread http://www.mkivsupra.net/vbb/showthread.php?267375-big-diff-driveshaft-measurements-please&highlight=driveshaft+big+diff? I am still curious if there really is a difference in the big diff and the small diff driveshaft, as the trsm says. Quote Link to comment Share on other sites More sharing options...
sdistc Posted July 21, 2012 Share Posted July 21, 2012 When I swapped from A03B (late model 6 speed diff) to B03B (early model 6 speed diff), I bought a brand new US spec LHS driveshaft/axle from Curt Aigner as the RHS one is identical. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 21, 2012 Author Share Posted July 21, 2012 Thanks fellas. Got everything loose and just about to drop out the old shafts. I'll do some measurements side by side. Diameter of all shafts is the same on mine. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 21, 2012 Share Posted July 21, 2012 (edited) About 660mm and 715mm long, that's not including the buldged bit that sits inside the diff. They are 30mm thick. Edited July 21, 2012 by JamieP (see edit history) Quote Link to comment Share on other sites More sharing options...
dandan Posted July 21, 2012 Author Share Posted July 21, 2012 When I swapped from A03B (late model 6 speed diff) to B03B (early model 6 speed diff), I bought a brand new US spec LHS driveshaft/axle from Curt Aigner as the RHS one is identical. Did you change the prop too? Quote Link to comment Share on other sites More sharing options...
Jos Posted July 21, 2012 Share Posted July 21, 2012 About 660mm and 715mm long, that's not including the buldged bit that sits inside the diff. They are 30mm thick. Thanks, will compare them with my small diff ones on monday, since my driveshafts are at work. I measured mine from the abs ring, hence the remeasure. Quote Link to comment Share on other sites More sharing options...
mark newman Posted July 21, 2012 Share Posted July 21, 2012 the small diff driveshafts,will fit the large case diff, I know that as that is what Im running on my car . the thickness is the same from small diff drive shafts, to 6 speed drive drive shalfs 30mm. that is what I have found out in the lat years of drag racing. after changing diffs and drivshalfs all he time. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 21, 2012 Author Share Posted July 21, 2012 Thanks mark. I have shafts and prop from a big diff car so I will defo fit the shorter passage shaft seen as it's all apart now. I'm not convinced yet that I need.to swap props as they look similar. Do people only change props when going na to tt diffs? Mine is a facelift tt and I just wa t to fit a pre facelift big diff. Quote Link to comment Share on other sites More sharing options...
Jos Posted July 21, 2012 Share Posted July 21, 2012 The big diff prop is 2 cm smaller than the small diff prop, so I doubt it will fit Quote Link to comment Share on other sites More sharing options...
dandan Posted July 21, 2012 Author Share Posted July 21, 2012 (edited) 100% correct there jos. I knew the facelift one was longer so I'm not sure why today I thought they were the same! Wishful thinking I suppose. What a crap job to do on your back, under the car, outside. It's turning into a full day to fit this diff Edited July 21, 2012 by dandan (see edit history) Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 21, 2012 Share Posted July 21, 2012 Whats with the diff change Dan? trying a different ratio or just upgrading to a stronger diff? Thanks, will compare them with my small diff ones on monday, since my driveshafts are at work. I measured mine from the abs ring, hence the remeasure. To the ABS ring i get about 545mm and 587mm Quote Link to comment Share on other sites More sharing options...
Jos Posted July 21, 2012 Share Posted July 21, 2012 To the ABS ring i get about 545mm and 587mm Then Toyota really made the big diff shaft 5 mm smaller, I measured 550 mm, thanks for clearing that up. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 21, 2012 Author Share Posted July 21, 2012 I bought a trd diff Jamie and decided I might as well change to a big casing at the same time seen as I'm running the best part of 600lb.ft through it so I went the whole hog Shouldn't need to even think about the diff again now. This one is a 3.538 though so a bit shorter than my original 3.266 - hopefully it'll be ok...if it's too short I'll have to get the 3.266 parts. We'll see. Quote Link to comment Share on other sites More sharing options...
sdistc Posted July 22, 2012 Share Posted July 22, 2012 I bought a trd diff Jamie and decided I might as well change to a big casing at the same time seen as I'm running the best part of 600lb.ft through it so I went the whole hog Shouldn't need to even think about the diff again now. This one is a 3.538 though so a bit shorter than my original 3.266 - hopefully it'll be ok...if it's too short I'll have to get the 3.266 parts. We'll see. Just make sure you get those axles far enough in when you reinsert them! Mine has been leaking like a sieve. Quote Link to comment Share on other sites More sharing options...
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