Posted by Paul (in NY) [12.64.134.25] on Thursday, September 12, 2013 at 08:51:25 :
In Reply to: 5.9 in a '77 w200 cc - engine and drive-shaft angles posted by dj in WA [174.240.6.199] on Thursday, September 12, 2013 at 03:00:39 :
When your installing a engine/tranny/married tcase, you do not install the combo first. You must first start at the rear differential. Measure the angle of the differential pinion. On all my old iron this angle was between 5 and 7 degrees UP.
The engine/tranny/T case output must be parallel to the rear differential which means, if the rear differential pinion is UP 7 degrees, then the output out of the T Case must be 7 degrees DOWN. Now everything is parallel. You DO NOT want the rear differential pinion to be in a direct straight line to the T case output.
Once you know the rear pinion angle, you then adjust the angle of the engine/Transmission/T case so they are parallel. You will NOT have the engine sitting exactly level in the frame. Once you get everything parallel, then you can measure the actual drive shaft angle between the T case output and the rear differential pinion. When you have that angle measurement you can determine if the shaft is within operating angles of the U Joints or if you need CV joints......or if your angle is simple to great and has to be reduced.
I am sorry to say, but you started on the wrong end and will have to change/modify your engine/tranny/t case mounts to give the required angle.
If you need help, email me and we can do a phone call and I will help.
Paul
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