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As you can see there are two ways of removing the O/D you can pull it off the collar bolted to the B-B0x casing, or unbolt the collar from the box.
When you unbolt the collar from the box the mainshaft can come back slightly, the frontmost sunchro sliders drop out of place and you have to strip the box.
When Volvo uprated the box they made the diameter of the layshaft axle bigger (easy to spot without dimantling) first gear was changed, as was reverse. Therefore all the gears must be kept together, and you need the approprate case because of the diameter of hole the layshaft axle goues through.
Mainshafts are overdive dependent, ie you must have one for a J type if thats the overdrive you have. There is nothing to stop you fitting any age of gearset to any age of mainshaft.
Equally you can fit any age of overdrive collar to any age of gearbox casing. Swapping gears on the mainshaft is no biggy, whatever you do you're going to have to strip the box. The only specialist tool you need are snap ring pliers.
Reverse gear should be part numbered. If you have it out mail me the number, I may well have a serviceable one loose somewhere. Or not....
Regards
Pete
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