Bry Posted July 18, 2020 Share Posted July 18, 2020 Bought an OS giken LSD and 4.08 gear set so thought today I'd whip out the diff and diff sub frame diff mount bush. All safe and secure I only had to remove my exhaust back boxes. I also removed the rear brace and disconnected the ARB but left it resting on the exhaust. What now should have been an hour's work took 3 fooking hours due to the 17mm nut that bolts to the diff mount stud being done up by king f*****g Kong himself. 2 different compressors, a 2 foot long breaker bar with 2 of us hanging off it still couldn't shift it. Eventually the inevitable happened and the bolt rounded, oh crap. Contemplating dropping the subframe which was not appealing. Taking a reciprocating saw to cut between the the diff cover and diff mount stud was an option but probably last resort. As a one last try on the nut my mate hammered a 5/8ths socket on it and Hallelujah it came off, no idea why it was sooooo tight. Now came the messy part Drilling out that subframe bush is the most dirty disgusting filthy job I've ever done . probably only took about half and hour but I reckon I swallowed half the silicone oil that came out and filled my ear holes up with all the fillings too. Tomorrow I'll saw out the outer race of the bush then as soon as my new bush arrives I can fit this. I'll report back when I'm finished 2 Quote Link to comment Share on other sites More sharing options...
ShortPaul Posted July 18, 2020 Share Posted July 18, 2020 Jeez looks a nightmare of a job buddy 1 Quote Link to comment Share on other sites More sharing options...
Mikey_S Posted July 18, 2020 Share Posted July 18, 2020 Oh my that picture of you caked in crud made me laugh!!! 1 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 18, 2020 Share Posted July 18, 2020 Most garages have an induction heat tool which makes light work of seized nuts/bolts. I use mine on a regular basis but I still sometimes revert to the old tried and trusted oxy/acc method, however with the confined space of the diff nut the induction method works great. Removing the bushing can be a messy job as you know, but once you put a cut in the outer shell it will just fall out. Remember and stick your new solid bush in the fridge/freezer overnight Quote Link to comment Share on other sites More sharing options...
andybp Posted July 18, 2020 Share Posted July 18, 2020 got to do mine this year oh joy 1 Quote Link to comment Share on other sites More sharing options...
pintopete58 Posted July 18, 2020 Share Posted July 18, 2020 Great bit of advice there alex shrinkage 1 Quote Link to comment Share on other sites More sharing options...
Umster Posted July 18, 2020 Share Posted July 18, 2020 Fair play to ya for doing it yourself. 1 Quote Link to comment Share on other sites More sharing options...
nissanman312 Posted July 18, 2020 Share Posted July 18, 2020 Great job isn't it I've just done the z1 subrame collars as well and the vibratechnics gearbox mount car feels great now removes all the vagueness from the 370 1 Quote Link to comment Share on other sites More sharing options...
Bry Posted July 18, 2020 Author Share Posted July 18, 2020 5 hours ago, ZMANALEX said: Most garages have an induction heat tool which makes light work of seized nuts/bolts. I use mine on a regular basis but I still sometimes revert to the old tried and trusted oxy/acc method, however with the confined space of the diff nut the induction method works great. Removing the bushing can be a messy job as you know, but once you put a cut in the outer shell it will just fall out. Remember and stick your new solid bush in the fridge/freezer overnight Yeah, I don't have a heat induction thingy, just a big fooking hammer for emergencies. The bush will spend the night with my captain Birdseye fish fingers for sure Quote Link to comment Share on other sites More sharing options...
Bry Posted July 19, 2020 Author Share Posted July 19, 2020 Got the outer bush race out with the reciprocating saw this morning which took about 5 mins and then had a tidy up. Now just waiting for the bush to arrive Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 19, 2020 Share Posted July 19, 2020 On the home straight, time for a tinnie Quote Link to comment Share on other sites More sharing options...
Bry Posted July 19, 2020 Author Share Posted July 19, 2020 8 minutes ago, ZMANALEX said: On the home straight, time for a tinnie Agreed Quote Link to comment Share on other sites More sharing options...
Bry Posted July 20, 2020 Author Share Posted July 20, 2020 19 hours ago, ZMANALEX said: On the home straight, time for a tinnie Alex, do you know if the driveshaft and stub axle bolts require thread lock when reassembling ? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 20, 2020 Share Posted July 20, 2020 3 hours ago, Bry said: Alex, do you know if the driveshaft and stub axle bolts require thread lock when reassembling ? Fit them dry mate and just torque to the recommended torque setting. The crown wheel bolts are the only ones that require thread lock. 1 Quote Link to comment Share on other sites More sharing options...
Bry Posted July 20, 2020 Author Share Posted July 20, 2020 Thank you for sharing that Alex, much appreciated Quote Link to comment Share on other sites More sharing options...
dave_7 Posted July 21, 2020 Share Posted July 21, 2020 Oh dear, i had best set a side of full day for doing mine. Great tip on putting the new bush in the freezer! Quote Link to comment Share on other sites More sharing options...
Bry Posted July 21, 2020 Author Share Posted July 21, 2020 Put the diff in this evening. That was a scary job balancing it on my Jack and using my leg to jack it up whilst fanagling the diff into position. Will finish it off tomorrow. Oh and my $10 bush insertion contraption worked great . 1 Quote Link to comment Share on other sites More sharing options...
Bry Posted July 25, 2020 Author Share Posted July 25, 2020 Finished the Install today. Took it for a little drive and my first impressions are. 4.08 gears are great, think I would have been disappointed with 3.9 gears. The OS Giken diff has given me alot more confidence in the car. The stock vlsd was quite erratic in its operation and provided a bare minimum amount of lock up. The OS diff is very predictable and made the car feel more planted, and if you want be a hoon it loves going sideways. The solid aluminium diff mount bushes transmit a small amount of diff whine into the cabin which I'm hoping I get used to otherwise I can always swapping them out for poly items. I always compare my 370z to my E46 M3 which wasn't really fair as I'd done a hell of a lot to the M3. My main observation was that the harder you drove the M3 the better it got where as, the harder I drive the 370 the more it felt out of its comfort zone. stock for stock I'd say they were pretty similar and now I've done a fair few mods to the zed I reckon if I had my old M3 on track against my Zed now, then I wouldn't bet on the M3 but it would be close. I now have a noisy ,uncomfortable 370z that I love to bits 2 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 25, 2020 Share Posted July 25, 2020 Looking good Bry: 1 Quote Link to comment Share on other sites More sharing options...
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