Attached pics of the gearbox/bellhousing I just pulled from my 68 1750 Canadian spider. I don't have any history on it except that the guy I bought it from drove it from Canada to Birmingham Al--he has since gone to where ever good alfa guys go. Engine was bulit by Stephen & Bill and Stephen could take trannys apart and put in or swap the 2nd synchro (he did a gearbox or 2 for me many moons ago).
Question is is this an early 105 1750 gearbox or is it a 2 liter box. Can you even tell from an exterior view and if so how? Note the strange (to me) tail bushing. Has original looking oil type sticker--
Hi Frank, I'd bet it is a 1750 box, from the exterior indications. You see the reversing switch wire coming out of the left upper of bell house indicates long shift rails that protrude through o-ringed holes into the bell house. The later 2lt boxes generally if not always had short rails that did not protrude and the switch was mounted on the rear housing tower left side although I have some rememberance of some boxes having 2 switches????
If you are going to separate the box from the engine you can put the box in 5th and rotate out put shaft 10 revs and determine the number of turns the input shaft does to eliminate the possibility of a GTj box which, if from the same era would look the same. A 1750 input shaft shaft would rotate 7.9 to 10 where as a GTj box would rotate 8.6 to 10.
You might find a casting date mark somewhere on one or more of the 4 castings.
Ken Geiger, Toronto
1965 GTA, RHD, Stradale
ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream
2001 BMW Z3 3.0i
Last edited by kengta; 12-30-2012 at 12:11 PM.