hi Todd
A few points to consider: A '68 GT6 and '79 Spit differential are similar but not identical. I don't think you can swap the guts from the Spit into the GT6 diff case as the early crownwheel carrier won't fit the late model nosecase. Even if they did match up, the swap requires special tools and precision adjustments; a job best left to those with both the tools and expertise to acomplish the task. You can still use the Spit differential in the GT6, if you choose to after reading the folowing caveats: The Spit will have had a swing spring held on by 4 studs, the GT6 will use a fixed spring held on by 6 studs. If you're going to use the fixed spring on the Spit diff case, you should plug the two unused holes in the case - use a short (about the thickness of the top of the diff case) threaded cutoff from a bolt/stud screwed in flush with the surface of the spring seat and straked/locktited so it can't keep threading itself in and drop into the works. (Not recommended to use the swing spring from the Spit as it will be too soft to hold up the heavier GT6 back end and its lower roll rate will make the already bad GT6 understeer even worse). The GT6 will have had a 3:27 ratio, the Spit will likely be a 3.89, so if you swap diffs, the engine will be revving quite a bit higher at highway speeds (about 20% faster). As a tradeoff, acceleration will be a tad livelier. There may also be some difference in the size of the stub axles and/or their bearings, but this shouldn't matter as the GT6 halfshafts should still mate up with the Spit stub axles OK and by '79 the Spit diff was about as strong as they got. Assuming you have the old diff and spring out of the GT6, the various bits of power train and suspension links removed, and have taken off the nuts/studs fastening the spring to the case, the only thing holding the spring on is dirt and/or corrosion. Apply penetrating oil and a bit of friendly (BFH) persuasion and the two should part company. good luck Scott > Date: Fri, 27 Mar 2009 10:37:54 -0700 > From: [email protected] > > Hi All, > > Since I blowed up the diff in our '68 GT6, I went out & purchased a diff from a '79 Spit. I went ahead & pulled the back off the blowed up punkin...not good inside there! I wanted to use the case from the GT6 diff with the 6 studs rather than the 4 stud Spit case. Well, not being an expert on these cars, I decided against tearing the Spit case apart. The problem is, I cannot separate the spring from the diff. I see there's some sort of pin in the center...certainly it's not holding the spring to the case? How is this done? I'm going to use the GT6 spring. > > Cheers, > Todd Bermudez #596 _________________________________________________________________ Reunite with the people closest to you, chat face to face with Messenger. http://go.microsoft.com/?linkid=9650736 _______________________________________________ Support Team.Net http://www.team.net/donate.html [email protected] http://autox.team.net/mailman/listinfo/spitfires http://www.team.net/archive
