ke704agte Posted December 12, 2011 Report Share Posted December 12, 2011 (edited) My 4agte Ke70 recently blew up its 2nd standard diff. So i decided to do a conversion I Recently completed my diff conversion in my ke70. R31 skyline lsd disc brake diff. After much research i found that everyone was either taking both diffs to an engineering shop to get the mounts changed over, or making up a jig. Both options are quite expensive/time consuming. Being low on cash i did the conversion a cheaper way and wanted to tell others- (this is the reason for this post). I first marked a centre line on both diffs (went between the upper trailing arms on the ke, and between the sway bar mounts on the r31 to work it out). Then marked a reference line along the diff (to get the right angle). Then took measurements for the upper trailing arms on the ke. Cut the mounts off the r31 (except the sway bar mounts, coz i will be using the r31 sway bar, as the ke one wont fit). Then welded the ke upper trailing arm mounts onto the r31 using the measurements. These were the only two mounts i measured. For the rest of the mounts to line up, i put the diff back in the car and bolted it in with the two welded mounts. Then i put the spring seat on the diff with the spring on top, then lowered the floor jack until the spring found its place. For the lower trailing arm mounts i bolted them onto the arms of the car, then bolt the shocks on as well. The mount should now find its place. So i am actually using the car as the jig! Same deal for the panhard rod- but drop the car off the jack so the ride hight is correct. Then check that the diff is centered (this also eliminates the need for an adjustable rod). When all looks good tack weld everything. Then remove from car and do fin al weld. The hand brake cables from the ke were used by cutting the retainer thing off (it flares out to hold the cable secure). Slide it through the r31 cable holder and weld the end of the cable to the lever (see photo). I then cut another slot for the return spring to sit in. The driveshaft was then too long- so it had to be shortened (i did this myself) but will pay someone to balnce it. (place at brendale quoted $245 to shorten and balance). The diff pinion flange from your ke can be swapped over to the r31 because they are both borgwarner diffs (saves drilling new holes). The r31 stud pattern is 4x114.3 (same as ke70) but the thread is different. So you'll have to buy new wheel nuts ($1.50each) R31: 12x1.25 Ke70: 12x1.5 Eveything worked out well. I took the centre to a diff shop and paid $250 to get the lsd shimmed up. The wheels just fit under the rolled guards with 215/40/16 tires (without shortening the diff either) The 4agte wont be able to break this one. More info: -Skylines Ratios: Manual: 3.7 and Auto: 3.89 (i used the auto) -Another thing to note is if you want the lsd: these only came out in the R31 silhouette and GTS models- :LSD was factory fitted to other models but not a standard fitted option. Reference: http://motamota.r31s...p?topic=81543.0 Oh and also i forgot to mention the brake lines. If you get the 2nd hand diff without the brakeline 3way t-piece its ok you can use your ke70 one. nissan have a ball type solid line while toyota have a flared type, it still works despite this. The threads are the same also. cost for conversion: r31 diff $200 reshimm lsd centre $250 (its really tight now) heatproof paint for calipers/ diff $20 lsd diff oil $25 will have to get the tailshaft balanced when i get round to it- don't no the cost of that yet??? TOTAL : $495!!! cheap as... hours worked on it: prob about 5-6 solid days work (big job) Questions and comments welcome -------------------------------------------------------------------------------------------------------------------------------- Next job is to take out the weak t50 gearbox and replace with w series. anyone know if this can be done without buying an aftermarket 4a to w bellhousing???? ($695 on ebay) maybe by modifying another bell housing???? or another stong box to use?? Ke70 standard diff Edited December 13, 2011 by ke704agte Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted December 12, 2011 Report Share Posted December 12, 2011 Well done! Nice engineering ideas and a good article. Do those diffs whine like my R31 Pinara does?? The wrecker wouldn't sell me one as he said all Pintaras whine... Quote Link to comment Share on other sites More sharing options...
ke70dave Posted December 12, 2011 Report Share Posted December 12, 2011 very nicely done, some people would pay more than that for a standard T series! Quote Link to comment Share on other sites More sharing options...
KE70+AE92 Posted December 12, 2011 Report Share Posted December 12, 2011 Awesome conversion, i will definitly be using this thread as a reference when i do my r31 diff conversion. Also what model r31 comes out with disc rear end?? Quote Link to comment Share on other sites More sharing options...
ke704agte Posted December 13, 2011 Author Report Share Posted December 13, 2011 Well done! Nice engineering ideas and a good article. Do those diffs whine like my R31 Pinara does?? The wrecker wouldn't sell me one as he said all Pintaras whine... Thanks mate, yeah i went for a drive in it today. It wines a little but nothing that noticable. Maybe mine is quiet because the centre is reconditioned?? Unless diff whine comes from the bearings?? The car feels a lot more rigid and has more traction (probably due to the bigger wider wheels that are on the rear with new tires). Quote Link to comment Share on other sites More sharing options...
ke704agte Posted December 13, 2011 Author Report Share Posted December 13, 2011 very nicely done, some people would pay more than that for a standard T series! yeah exactly why i thought i'd give it a go myself. And besides i don't think t series diffs could handle a 4agte-what do you think? Quote Link to comment Share on other sites More sharing options...
ke704agte Posted December 13, 2011 Author Report Share Posted December 13, 2011 Awesome conversion, i will definitly be using this thread as a reference when i do my r31 diff conversion. Also what model r31 comes out with disc rear end?? Pretty sure they are all disc brake rear end. More info: -Skylines Ratios: Manual: 3.7 and Auto: 3.89 (i used the auto) -Another thing to note is if you want the lsd: these only came out in the R31 silhouette and GTS models- :LSD was factory fitted to other models but not a standard fitted option. Reference: http://motamota.r31skylineclub.com/index.php?topic=81543.0 Oh and also i forgot to mention the brake lines. If you get the 2nd hand diff without the brakeline 3way t-piece its ok you can use your ke70 one. nissan have a ball type solid line while toyota have a flared type, it still works despite this. The threads are the same also. Quote Link to comment Share on other sites More sharing options...
BUZ440 Posted December 13, 2011 Report Share Posted December 13, 2011 Very informative and helpful writeup, will provide alot of insight for those wanting to change, The R31 diffs are very similar to the live diffs found in VL/N/P 10 bolt I was under the belief the wagons came with 4.11 LSD??? You can buy mounting brackets to suit the standard corolla housing and mount 31 calipers, you wont be able to get the backing plate on, and the spigot will need to be shaved, and have a complete blank rotor, if you want the look that is.... Great write up otherwise :y: Quote Link to comment Share on other sites More sharing options...
ke70dave Posted December 13, 2011 Report Share Posted December 13, 2011 i believe KAAZ make an aftermarket 2 way that fits in the R31/commondore housing as well. Quote Link to comment Share on other sites More sharing options...
BUZ440 Posted December 13, 2011 Report Share Posted December 13, 2011 Yes they do Dave, and are a trick piece of gear, the Aussie diff shop on the Gold Coast do a similar conversion, I got mine done for $450 for a gemini, shorten and transfer brackets onto VL diff, My Hilux diff was alot more, given how much i intended on throwing at it, Still great option Quote Link to comment Share on other sites More sharing options...
ke70redevil Posted February 14, 2012 Report Share Posted February 14, 2012 hey mate what master cylinder you running? cheers Quote Link to comment Share on other sites More sharing options...
ke704agte Posted April 1, 2012 Author Report Share Posted April 1, 2012 hey mate what master cylinder you running? cheers Just standard master cylinder, and ive also got s13 front brakes up front. All works fine in my opinion Quote Link to comment Share on other sites More sharing options...
XIX OLLIE XIX Posted April 22, 2014 Report Share Posted April 22, 2014 Hey mate nice work with the rear end I have just purchased a r31 rear end to put in my ae71 is it at all possible to send me the messurements of the of the upper trailing arm mounts you re welded ie. How far out from the diff centre did you make them on each side thanks Quote Link to comment Share on other sites More sharing options...
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