animator Posted April 5, 2008 Share Posted April 5, 2008 Hi, I've fitted 1500 Spitfire engine in my Herald and now I have got round to upgrading the 4.11 diff to a 3.63, so I started to take off the old one, then realised that the flanges (for the half shafts) on the 3.63 diff are bigger. So what are my options? will the spitfire halfshaft flanges fit on the Herald UJ's ? are 1500 Spitfire halfshafts bigger as well? neede some ideas on the cheapest way to do this. Link to comment Share on other sites More sharing options...
marktheherald Posted April 5, 2008 Share Posted April 5, 2008 Hi, I've just completed this on my 13/60. 1500 engine, Spit Mk4 O/D 3 rail g/box and 3.63 diff. The main differences on these later diffs is the flanges, as you have discovered. The input flange needs to have a matching one on the prop. You will need to source a larger yoke flange for the prop and fit it together with a new U/J. The output shafts can be removed from the 3.63 and the original ones from the 4.11 diff are a straight swap. UNLESS you had an EARLY 4.11 diff, which had smaller/weaker output shafts. Just withdraw one of each, and if you are lucky, the splines will match. Dead cheap so far! You won't have to do anything to your half shafts but it will be worth- while checking your U/Js at the time. Worst case scenario:- 1x prop flange. 2x output shafts. 3x U/Js..... Best case:- AS LITTLE AS POSS!! Good luck, Mark. Link to comment Share on other sites More sharing options...
animator Posted April 6, 2008 Author Share Posted April 6, 2008 Great! Thanks for your reply,I'll start looking for some output shafts.Anymore tips on this operation? The diff doesn't want to drop out even though i've undone all the nuts and bolts! Link to comment Share on other sites More sharing options...
seth Posted April 6, 2008 Share Posted April 6, 2008 This might sound silly but have you unbolted it from the rear spring? I recently nearly forgot about that one! If you're sure everything is undone then it might just need some levering where it mounts to the chassis at the back. Link to comment Share on other sites More sharing options...
elm-phoenix Posted April 6, 2008 Share Posted April 6, 2008 you can swap the shafts of the old diff over thats what iv done to make my 3. into smaller shafts, and its been fine for 2 years use so far Link to comment Share on other sites More sharing options...
marktheherald Posted April 7, 2008 Share Posted April 7, 2008 Apologies if my reply was unclear, but as phoenix says, your 4.11 shafts should fit straight in to the 3.63 diff. Mine did, they were out of a 13/60 diff. Mark. Link to comment Share on other sites More sharing options...
animator Posted April 9, 2008 Author Share Posted April 9, 2008 OK, Thanks everybody. Link to comment Share on other sites More sharing options...
Tim Bancroft Posted April 9, 2008 Share Posted April 9, 2008 When attempting to get the rear lugs of the diff back into the chassis apertures, smear a bit of rubber grease (Don't use petroleum based grease)around the bushes-really helps.Also use a good trolley jack to lift it up into place-I also use cable ties to secure the diff onto the jack-works for me-makes the job very simple! Link to comment Share on other sites More sharing options...
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