Kind of hate to resurrect this old thread, but it's the one that led me to this site looking for help finding a good used Saginaw 4-spd to which to adapt my Saginaw 3-spd OD unit! It's based on that very 2-page, April 1975 Hot Rod article, referred to earlier in this thread and which I thankfully tore out and copied at the time! . . . been "Rodding" since the mid-'50s!Hello,OK...well... only problem with installing a 3 SPEED cluster gear into a 4 SPEED trans is with a 4 SPEED input/output shaft assembly, there isn't a gear on the cluster for a 4th GEAR.
Yes, Saginaw 3 speed case is same as a 4 speed case, and both 3 and 4 speed side covers bolt to either case, but if you only have 3 gears to work with on the cluster, then that is all you get, NOT 4.
Also, I have NEVER seen a "planetary" in a Saginaw manual transmission, only in automatics.
I found some more info on the od trans, today but it doesn't look so good.
My friend found the GM order and Im not to sure about any of this, but it's
81-86 light trucks with an RPO MY6. Its supposed to be 4 speed manual od but apparently they were New Process units to GM specs . . . I guess nothing Saginaw about it. I'm not sure about splines or any thing yet.
But Im still looking for the Saginaw version but it's certainly looking bad. I can't even find a general parts diagram or reference for one. If anybody stumbles across any parts info I would appreciate it.
. . . well, I hope at least that I put to bed some misconceptions in the earlier posts here . . . that's what you get from an "old fart!" Now that I think of it, when you locate that article in your Hot Rod archives, perhaps you could make a much clearer scan of the pages to clear up the illustrations and exploded views. Mine were copied off the original pages back in the late '70s and scanned off that old double-sided copy. Today's equipment is SO much higher resolution and, if scanned directly off the original, should produce much better copies!Excellent! I knew I had seen that before. I have all the old HotRods and now I know what issue to look for. I think this may go in the Archive.