1986 International Cargostar - Allison auto tranny problems?? And power steering gearbox shaft leak. Hi guys, I just picked up a clean 1986 international cargostar cabover with a DT466 and Allison automatic transmission, it's the perfect truck for what I need and I want to get it going right. I was very excited about the truck when I first bought it. It seems clean. The transmission felt fine when I tested it before buying it at the auction, it shifted from neutral to drive to reverse to drive and back to drive smoothly with no clunking..and was very responsive and felt good when pulling it forward and back 10-15 feet in the parking lot... BUT now I am unfortunately discovering after buying it and driving it down the road that it won't shift from gear to gear automatically. It won't stay in overdrive (5th i think it is). I can get it to run in overdrive if I shift up to it and then am not going up a hill and if I'm not pressing the pedal too hard, but otherwise it keeps coming out. It also will not shift from any gear to another gear. I have to shift it all manually. It doesn't shift right is basically what I'm saying. Could this hopefully be something other than the torque converter or transmission itself.? I would really like to avoid a transmission specialist telling me that it needs a $3,000-4,000 transmission or torque converter rebuild or replacement job, if possible!?!? (fingers crossed!) My question for any of you experts is could it be something like a trans computer or a speed sensor , or some other sensor or modulator or something other than the tranny itself? Is there anything like that you guys know of? I am reluctant to bring this to a transmission place before I know the answer to this question, because I know what they'll most likely say of course. Do any of you guys know much about this set-up? Is there any such thing you all have heard of that would cause such a problem? The fluid actually looks very cranberry colored, and does not smell bad in particular, although it looks very milky, whitish, like some cream was poured in there or something, basically that type of color, but again, not low or doesn't smell bad at all . Someone told me that that could be from a little water getting in though. Any professional opinions? ? Also, the power steering gearbox is leaking through the shaft seal right up against the frame rail there. I wonder if that's a simple rebuild where I can just get a seal someplace and just take it apart and fix it for cheap ... Or is that some hard project and difficult thing for an average mechanic to do and I'm better off taking it someplace who rebuilds such specialty items, or do I need to just put in a whole new remanned one , and will cost me a lot to find a part that's rare. Basically guys what's the easiest and cheapest way out of this one? Thanks. The truck is awesome! I'm very excited about it!