I have a 923a2 that I bought for the engine but found a machine shop that the owner needed a trade of services so a rebuild on my 925a2s engine became a no brainer. Only thing wrong with the 923 is the tranny doesn't shift right. It will go through 1st and 2nd and will try for 3rd if it is pushed but when I let off it drops back to 2nd. Reverse is fine. My question is what controls the shifting? Selonoids? Vacuum? Governor? The truck is to nice to part out.