pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 I managed to convince a breaker in Chicago to sell me the crown wheel and pinion from a US spec SC300, they have a 4.273 final drive ratio which is the shortest ratio Toyota make for the Supra family of diffs as far as I know. I have it fitted to my NA torsen diff and it works a treat, it should be fun at drag meets and even around Mondello with the 1JZ driving it, top speed will be 150mph tops! The only reason it worked out for me though was because I had a mate visiting relatives in New York at the time, the parts were shipped from the breakers to where he was staying and he very kindly brought them home for me in his luggage, all I had to pay was the excess luggage charge for the extra bag. Other than that the cost of shipping a lump like that from the States would've been prohibitive. The shorter 4.083 ratio from a J-spec NA diff should greatly improve things if you are currently running a turbo diff though, and if it's a J-spec turbo diff (small casing) I'm sure you can actually bolt the crownwheel and pinion straight on to the LSD if thats what you are trying to keep. Quote Link to comment Share on other sites More sharing options...
The-Plethora Posted March 15, 2011 Share Posted March 15, 2011 Looks good Craig, even better now you have ran a sponge over it careful of that biblical pot hole on the way out of yours! Be good to get those vids up when you can. Quote Link to comment Share on other sites More sharing options...
AlexM Posted March 15, 2011 Share Posted March 15, 2011 Well it looks quick.. I expect Round 1 & 2 to be quite fast, Round 3 will be tight and twisty - should give you a little room to try out diff and turbo options. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 I managed to convince a breaker in Chicago to sell me the crown wheel and pinion from a US spec SC300, they have a 4.273 final drive ratio which is the shortest ratio Toyota make for the Supra family of diffs as far as I know. I have it fitted to my NA torsen diff and it works a treat, it should be fun at drag meets and even around Mondello with the 1JZ driving it, top speed will be 150mph tops! The only reason it worked out for me though was because I had a mate visiting relatives in New York at the time, the parts were shipped from the breakers to where he was staying and he very kindly brought them home for me in his luggage, all I had to pay was the excess luggage charge for the extra bag. Other than that the cost of shipping a lump like that from the States would've been prohibitive. The shorter 4.083 ratio from a J-spec NA diff should greatly improve things if you are currently running a turbo diff though, and if it's a J-spec turbo diff (small casing) I'm sure you can actually bolt the crownwheel and pinion straight on to the LSD if thats what you are trying to keep. so i can take the final drive from my na open diff and put it in my lsd so i will have the rite ratio but keep the lsd ? Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 Well it looks quick.. I expect Round 1 & 2 to be quite fast, Round 3 will be tight and twisty - should give you a little room to try out diff and turbo options. i think the car is pretty quick , the only speed issue will be the driver Quote Link to comment Share on other sites More sharing options...
nevins Posted March 15, 2011 Share Posted March 15, 2011 i think the car is pretty quick , the only speed issue will be the driver Let me drive then lol Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 Let me drive then lol i would, but neither of us can do body work Quote Link to comment Share on other sites More sharing options...
nevins Posted March 15, 2011 Share Posted March 15, 2011 It will only be the rear bumper and possibly the quarters lol, sliding ftw Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 so i can take the final drive from my na open diff and put it in my lsd so i will have the rite ratio but keep the lsd ? IF the TT and the NA diff cases you have are the same size then yes I think its possible to do so as the crownwheel has the same overall dimensions and mounting points in both. I'm not sure what is needed to make the pinion, flange and whatever driveshaft you are planning on using fit together, if it's a complete NA driveshaft then there should be no problems there. This is all a bit of an uneducated guess though Craig, I've had absolutely no dealings with any TT diffs, you'll really need to confirm all this theory before you get your hopes up mate. Quote Link to comment Share on other sites More sharing options...
nevins Posted March 15, 2011 Share Posted March 15, 2011 Will be n/a shafts being used more than likely as I'm sure he has some there Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 Well if you can get the particulars of the diff or of the crownwheel and pinion that is in the diff now from somewhere we can compare the dimensions and mounting points to the 4.083 crownwheel and pinion I have here. That will save you some time stripping diffs if it's not going to work. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 well i have both hear so i might as well strip and find out the hands on way Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 well i have both hear so i might as well strip and find out the hands on way Well then get to it young man! I can send you a link to the diff disassembly/reassembley section of the soarer maintenance manual if you need it for torques and such. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 that would be great if you could , cheers Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 The manual starts about one quarter of the way down the page. There is also a link to actual pictures of the job at the bottom of the page. http://www.soarerworld.com/forum/showthread.php?p=216416 Let me know if you have any problem accessing the page. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted March 15, 2011 Author Share Posted March 15, 2011 that looks fun :s, a post for the na lsd in the wanted section could be less taxing Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 15, 2011 Share Posted March 15, 2011 that looks fun :s, a post for the na lsd in the wanted section could be less taxing But not as much fun! In fairness if I could have gotten the whole diff from the States instead of just the crownwheel and pinion I never would've needed to do the swap into my own diff case. So if you think you can get a complete diff for money you are willing to part with I'd go that route alright. Or maybe someone going NA-TT would swap with you for yours. Quote Link to comment Share on other sites More sharing options...
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