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You wont want this advice but here it is anyway....
That's a spit diff, so belongs on a spit. Ripping its innards out to stick in an 1850 axle is seriously dim.
You'll have to take off the flange to remove the front support beam, carefully counting the threads as you go and put it back exactly as it was to keep the collapsible spacer intact. The nut is done up seriously tight and I very much doubt you will have the kahunas to get it off without the case being bolted to a Spitfire...
Then you have to take out the little half shafts and get the diff thing off the back case. You need an allen key to do the small retaining bolts - pretty fiddly.
Is there nobody who will sell you a TR7 4 speed axle? Or even an 1850 manual or late 1500 one?
Spit diffs in 3.63 form a pretty good currency for GT6's and vitesses and other heraldry. I'd sell it on....
Sprint diff is also of interest...3.45:1 and as strong as you'll ever need. Must be one of them about too...
Jonners
Dear oh dear Jonners, are you getting old and losing your sense of adventure?
An angle grinder will remove the front plate without disturbing the pinion - cut just outboard of the securing bolts!
Dolomite 3.63s are getting hard to find, ditto the early TR7 4 speed diff (which was superceded early anyway)
A Sprint diff will necessitate further modification of Phil's custom 1500 prop. And give problems with oversize rear brakes.
So this is the best and cheapest way of raising the final drive ratio by not-too-much to suit the installed engine.
Steve