Postby waynosworld » Sat Aug 29, 2015 9:03 pm
I am kinda surprised that no one mentioned the best way to make a short shaft 5 speed for your "L" block powered truck/car that is not weak like the dogleg, which are getting hard to find anyway.
So, in 1980 the 720 came with an L20b, it also came with both the 4 and 5 speed longshaft transmissions, the front case/front cover/lower cluster gear bearing is needed off either the 4 or 5 speed transmission, one might be able to use the later 620 5 speed case also, but I have never used that case myself.
Next you need a shortshaft 5 speed out of a 1985/86 Nissan 720 regular cab/short box 2wd, it has a napZ case on it, so what you do is take the napZ case off the short shaft 5 speed, and put the 1980 "L" case/front cover/bearing from the long shaft 4/5 speed onto it, now you have a short shaft 5 speed that will bolt onto any "L" block.
In my opinion one should buy the best lower bearing(cluster gear bearing) one can buy when doing this conversion, the lower bearing is the weak spot on these transmissions, I wrote an article on how to do this above, just not sure if I should post a link to another forum.