I have a relative who overheated her engine in her 2006 v50. I was able to buy a complete, but wrecked, 05s40 from an insurance auction. When I replaced the engine,I decided to just reuse her transmission, as I knew it was working fine, but had a lot of miles and very dark fluid. Some how, I didn't get the driver's axle seated correctly in the splines. So after the splines were damaged, I decided to swap in the trans from the part car. This transmission looked to have been rebuilt fairly recently. The torque converter had a build date of only a 1 1/2 years from when I got the car. The vb pan also had a gasket, instead of sealer. So I was very hopeful I could put this transmission in and be done with this car for a while.
They drove it for about a month, with no problems. Then they tell me it's just reving and not shifting. I check it out and figure it's a bit low on fluid, so maybe it's that. I used Valvoline max life fluid, when I did the swap. Even topped off, it still was very slow to shift up from 1st to 2nd. If I put it in manual shift mode, I could count any where from 3 to 5 seconds from when I shifted up to 2nd and the transmission actually shifting. Plus the shift was very harsh.
I decided it was either a solenoid or vb issue. So I swapped the old vb and solenoids into the this transmission. The old transmission worked fine, and was only removed because of the axle not being seated and messing up the splines. At the same time, I drained as much of the Valvoline as I could, and replaced it with aisin transmission fluid.
Got it all back together and it's pretty much just as bad as before. Delayed up shifts from 1st to 2nd. It wasn't setting the transmission service urgent, red triangle as often, but I only drove it around my neighborhood several times, in case it failed on me.
So 2 different vbs and solenoids, and the trans had the same shifting problem. Is there anything I can do to salvage this transmission? And advice on the cause of this?