Kev W Posted February 18, 2015 Share Posted February 18, 2015 Hi all, I've got a MK3 roto GT6 and I'm having the diff reconditioned but to keep the car on the road I've got a replacement diff. Thing is, the one on the car has 6 stud mountings and the spare I've got is a 4 stud probably off a swing spring (same ratios). Is it a case of fitting the 4 stud and leaving 2 studs off or is that not an option?Cheers for any help!Kev Quote Link to comment Share on other sites More sharing options...
RobPearce Posted February 18, 2015 Share Posted February 18, 2015 It's certainly possible to fit a four stud diff just by leaving two studs out. I did it on a Herald estate (1500 engine so we fitted a 1500 Spitfire diff) and I think my Vitesse is also that way.I need to replace the diff on my GT6 too, but I need to get hold of a 3.63 (or 3.27) one first. It's currently a 4.11 off a 13/60... Quote Link to comment Share on other sites More sharing options...
Royboy66 Posted February 18, 2015 Share Posted February 18, 2015 Kev , The 2 empty stud holes in the diff can be plugged with a couple of 3/8" UNF grub screws/blanks about 1/2" long, made from some old 3/8"UNF bolts, with a screwdriver slot hacksawed in the end. Loctite them in.Roy 8) Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 18, 2015 Author Share Posted February 18, 2015 Cheers guys!@Roy, 'tis the other way around, the replacement diff has only 4 stud holes, I don't suppose this will affect rigidity with all the other fixing points? :o Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 18, 2015 Author Share Posted February 18, 2015 9716 wrote:It's certainly possible to fit a four stud diff just by leaving two studs out. I did it on a Herald estate (1500 engine so we fitted a 1500 Spitfire diff) and I think my Vitesse is also that way.I need to replace the diff on my GT6 too, but I need to get hold of a 3.63 (or 3.27) one first. It's currently a 4.11 off a 13/60...Rob, the guy I got my diff from says he has both of those diffs, I'll PM you his details. Quote Link to comment Share on other sites More sharing options...
mikeyb Posted February 18, 2015 Share Posted February 18, 2015 The GT6 rotflex spring has fixed leaves like the Herald/ early Spitfire standard ones. Therefore I would be wary to fit it to a 4 stud diff as experience has shown if you do the same to a Herald etc ie. fit a fixed spring to a 4 stud diff, then the clamp plates have been know to snap. Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 18, 2015 Author Share Posted February 18, 2015 Yikes! I don't like the sound of that Mike! :o Quote Link to comment Share on other sites More sharing options...
thescrapman Posted February 18, 2015 Share Posted February 18, 2015 You could fit a 6-stud rear case to your spare diff, only take 10 mins and a new gasket.There ought to be plenty of rear cases floating about. Quote Link to comment Share on other sites More sharing options...
GT6 M Posted February 18, 2015 Share Posted February 18, 2015 OR, use the OE diff plate, and drill some extra wols init.dont have to go right thru, some are, some arnt.the cast is soft enuff to drill by hand held drill toojust mek sure its verticle in both planes, 2 watchers will help tell ye this.M Quote Link to comment Share on other sites More sharing options...
Martin M Posted February 19, 2015 Share Posted February 19, 2015 :) :) Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 19, 2015 Author Share Posted February 19, 2015 thescrapman wrote:You could fit a 6-stud rear case to your spare diff, only take 10 mins and a new gasket.There ought to be plenty of rear cases floating about.Great idea! I could use the rear case of the one I take off for now. I have a horrible image of a load of cogs falling out onto the floor when I open it, I take it the pinion wheel and the rest are located in the front of the case?! ??) Quote Link to comment Share on other sites More sharing options...
RobPearce Posted February 19, 2015 Share Posted February 19, 2015 Yes, all the complex works are assembled in the front part, the rear casing then fits over and holds the output shafts. The nose piece and 'works' are common with the small Dolomites, where they fit a live axle. Quote Link to comment Share on other sites More sharing options...
Rubce Posted February 19, 2015 Share Posted February 19, 2015 Hi KevWhat's up with your original diff?CheersBruce Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 19, 2015 Author Share Posted February 19, 2015 Hi Bruce, when I last serviced the car I noticed the diff took a lot of oil, so wasn't too surprised when after a run quite a bit of it appeared on the garage floor! I thought the problem was the pinion oil seal so I changed that (it doesn't seem right to take a metal seal out and replace it with a flimsy rubber one!), after a test drive, well the next morning, there was still a puddle on the floor from the centre joint it seemed. When I was replacing the pinion seal I noticed there was quite a bit of play between the wheel moving and the prop moving, add that to the fact that it had started to make a faint noise and I don't know how long it had been running "dry" I thought it best to replace it! You are more than welcome to come round and give it a blast, always nice to have a second opinion! ;)Kev Quote Link to comment Share on other sites More sharing options...
Rubce Posted February 20, 2015 Share Posted February 20, 2015 Hi KevYes I can pop round to give you the opinion of another pair of ears. You can return the favour and listen to the horrible thrumming noise coming from the rear of ours!Bruce Quote Link to comment Share on other sites More sharing options...
Kev W Posted February 21, 2015 Author Share Posted February 21, 2015 Cheers Bruce 8) Quote Link to comment Share on other sites More sharing options...
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