Strik3r Posted October 21, 2009 Share Posted October 21, 2009 So after my hunting around for gts4 diffs to transplant the crown wheel and pinion from into the GTR diffs, I found that these items are becoming harder and harder (AND more expensive) to come by. Particularly seeing as you have to buy the entire GTS4 rear diff and front sump and diff just to get the crown wheel and pinion out of both of them (nobody actually wants the viscous gts4 diff). I was originally going to Cryotreat my CWP's to make sure they were up to the task, but after talking to a friend who has access to a CNC machine, we discussed the possibility of digitizing the crown wheel and pinion from the front and rear diffs out of a gts4 (4.375 ratio) and having a engineer produce replacement CWP's for people wanting taller diff ratio's. To the best of my knowledge, these diffs would suit 32's, 33's and 34's (rwd cars could just use the rear diff, while GTR's/Stagea's would use the front and rear). Another big advantage would be that the new CWP's would be constructed out of stronger materials, effectively upgrading the strength of the diff. I'm no expert on any of this, but can possibly relay any questions that people might have. At the moment, i'm just trying to find out if there is enough interest to have this done. We will be able to set it up as a group buy and it should work out very cost effective. I havent done any number crunching, but to defray the cost of the cnc'ing and digitizing over the produced CWP's, i'm guestimating we'll need around 10 people in the group buy to make the process worthwhile. The more people we have, the cheaper it becomes. If i get enough interest in this thread, i'll have a chat to my friend and work out how much each CWP will cost. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/ Share on other sites More sharing options...
bigmikespec Posted October 21, 2009 Share Posted October 21, 2009 I would be interested, price dependent of course. It is not just that they are hard to source, it is also the fact they these gears may be 19 y.o. and done 100,000km or more. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4892058 Share on other sites More sharing options...
XRATED Posted October 21, 2009 Share Posted October 21, 2009 I'm keen dependant on price. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4892103 Share on other sites More sharing options...
NickR33 Posted October 21, 2009 Share Posted October 21, 2009 interested, let us know when you have a ball park cost:) Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4892301 Share on other sites More sharing options...
N1GTR Posted October 21, 2009 Share Posted October 21, 2009 Same as above, keen dependant on price. What's the timeframe here? Got a fair bit of work happening to the gtr soon and would love to do these at the same time Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4892864 Share on other sites More sharing options...
Guilt-Toy Posted October 21, 2009 Share Posted October 21, 2009 send me the samples and i will be able to get them made cheap Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4892919 Share on other sites More sharing options...
9krpm Posted October 25, 2009 Share Posted October 25, 2009 Depending on the cost and reliability, I am keen for a set as well Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900137 Share on other sites More sharing options...
Swiper the Fox Posted October 25, 2009 Share Posted October 25, 2009 Depending on the cost and reliability, I am keen for a set as well me too Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900214 Share on other sites More sharing options...
J'z-R33 Posted October 25, 2009 Share Posted October 25, 2009 Interested, will any testing be done? or is it too early to be asking... Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900241 Share on other sites More sharing options...
aDrew_C Posted October 26, 2009 Share Posted October 26, 2009 Can I ask why people wan't a shorter ratio? I've got 4.375:1 right now and find it a bit too snappy and violent for an rb25. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900332 Share on other sites More sharing options...
Strik3r Posted October 26, 2009 Author Share Posted October 26, 2009 Ok so I talked with my contact about the crown wheel and pinions and after some research, he told me that his machine isn't specific enough for the job. We were referred to Albins Off Road gear - www.albinsgear.com.au who do a lot of work for the v8 supercars and rally cars. They basically said that it isn't going to be a cheap exercise unless we are talking about resonably high volume stuff. The ball park figures we were quoted were $5000 for a 1 off CWP, and around $10000 if we got 5 CWP's. Presumably, it would continue to scale up, but at best guess we would need to be ordering something like 20 or 30 units before the per-unit cost got down to what I would consider reasonable levels (<$1000 per unit). I would have investigated further, but these sort of figures require more responsibility and co-ordination than I am willing to undertake at this point in time. If someone wants to continue to investigate this and organize a large-scale group buy, then I would be interested, but I'm not willing to take it on myself. Thanks for the interest, and if someone wants to organize it, feel free to contact albins yourself. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900375 Share on other sites More sharing options...
bigmikespec Posted October 26, 2009 Share Posted October 26, 2009 Probably better off sending it to someone who is more suited to runs of 1-10 sets of parts instead of a company who wants (or needs) at least 30+ to make it at all viable as their machine time is worth a lot more. Thanks for the effort! Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4900560 Share on other sites More sharing options...
N1GTR Posted October 26, 2009 Share Posted October 26, 2009 Albins Off Road gear - www.albinsgear.com.au $2000 for an end if there's an order of 10, so rear plus front = $4000 each person Or $5000 for one end on a one off order. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4901114 Share on other sites More sharing options...
bigmikespec Posted October 26, 2009 Share Posted October 26, 2009 $2000 for an end if there's an order of 10, so rear plus front = $4000 each personOr $5000 for one end on a one off order. Out of interested what material? Any heat treatment after? Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4901186 Share on other sites More sharing options...
N1GTR Posted October 26, 2009 Share Posted October 26, 2009 Unsure of material, yeah heat treatment included. The guy i spoke to was a Steve, he said the parts from them would be stronger than the OEM parts for sure Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4901208 Share on other sites More sharing options...
shanef Posted October 28, 2009 Share Posted October 28, 2009 Out of interested what material? Any heat treatment after? Something flash. Shot peened plus a magnitude of other treatments all included in the price. Unsure of material, yeah heat treatment included. The guy i spoke to was a Steve, he said the parts from them would be stronger than the OEM parts for sure Yeh Steve is the guy i spoke with aswell. They also do gearsets. Dog arrangement with forks, shafts etc between 8-9k. They list a synchro on their site but i didnt get a price on them. Axles and shafts they can do aswell, again didnt get price. Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4905870 Share on other sites More sharing options...
Swiper the Fox Posted October 28, 2009 Share Posted October 28, 2009 Has anyone approached PPG? Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4905883 Share on other sites More sharing options...
Mr GTR-32 Posted October 28, 2009 Share Posted October 28, 2009 i have a great set of Gts4 front and rear ratios which i purchased 2 years ago for $500 shit now they have gone up to $800 to $1000 the only secong hand item i purchased that actually went up in value haha Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4905963 Share on other sites More sharing options...
SilverECR33 Posted October 30, 2009 Share Posted October 30, 2009 Cant we buy it off the shelf at all? Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4910059 Share on other sites More sharing options...
33gtst Posted October 30, 2009 Share Posted October 30, 2009 Can I ask why people wan't a shorter ratio? I've got 4.375:1 right now and find it a bit too snappy and violent for an rb25. same here,well may be not snappy and violent(cause mine is welded) but I have one in my 33 and really really hate it. Instead of using 3rd I now have to rely on 4th more for everyday street driving, and my 4th is a little bit special. Cant wait to get the diff out. LOL Link to comment https://www.sau.com.au/forums/topic/292865-eoi-on-4375-ratio-diff-gears-for-skylines/#findComment-4910253 Share on other sites More sharing options...
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