1996 Jimmy Rough Shifting

There are several potential problems with our Jimmy’s transmission, none of them is unsolvable and they aren’t terribly expensive, either.

First, even though the transmission fluid color looks okay, your fluid might be down slightly. If this is the case, then the tranny will be working overtime to add enough pressure to the existing fluid in order to enable that all parts work properly. This, however, does leave some parts exposed at times and can lead to slipping which is the type of problem you are talking about. Check to see fluid level is okay. If it isn’t, then add enough fluid, very slowly to assure you aren’t overfilling the case. A little too much is the same as down just a bit, so be careful.

As to the other problems. It is quite possible there is a plugged gallery in the valve body which is preventing the fluid from flowing correctly and accessing the proper gear. All it takes is a faulty check valve (a spring-driven, light ball bearing style valve) to prevent it.

It is also possible that the gear solenoid actuators are also causing problems. Since these devices are pretty accessible, it is easy to have them checked.

Whatever way you are looking at it, I don’t think there is much a problem with the pricey stuff in the transmission, the torque converter, input-side gearing, output-side gearing, clutches or bands. Instead, you will likely find the problem in the areas we have discussed. The good news for you is that you are looking at a likely maximum cost of about $750 for the works.

I hope this helps you out. Let me know what you find.