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Turbo 350 4x4 transmission8/7/2023 ![]() Basically, I wanted to make the information available and also keep it simple and easy to understand. I set two goals for this book: to provide the information I’ve learned over many years to others and to present that information in a way that puts this task well within reach of the average enthusiast. I don’t give a second thought to stripping any automatic transmission down to a bare case, then putting it back together with my large assortment of hand-crafted custom tools and self-learned special procedures. Over three decades and hundreds of units later, I’m armed with quite a bit more knowledge, and a toolbox full of homemade tools dedicated strictly to transmission work. The story has a good ending although that particular rebuild took me several weeks, and I wasn’t at all confident that the car was going to move under its own power when I lowered it to the ground for a test drive! I managed to find five of the six check balls, and after careful observation could see the tracks in the case where they were supposed to be. At that moment I was really thinking that I should have carried it to a shop, but my income level at that time just didn’t have any room in it for a high-performance muscle car that wasn’t moving because I had fried its transmission. I had removed the valve body and turned the unit over to allow the fluid to drain out. I still chuckle every time I lift the valve body off of a transmission, and think back to the six check balls that were rolling across the concrete floor in my garage. ![]() Not that I really wanted to do it I would rather have gone hunting or someplace with my friends. ![]() Without any outside assistance I had decided to tackle a TH350 transmission rebuild. It was a Saturday afternoon in early fall 1978 in the small garage detached from the house we lived in at that time. The key component here is information, followed closely by motivation. Similar to most other things associated with this hobby, you can get results that are just as good, or better, and save money by doing it yourself. There has always been a mystique about transmissions that makes even the most skilled automotive technicians avoid them like the plague! They also get hit with some pretty hefty bills from not doing them at home. Transmissions, in particular, are at the top of the list for the items that get farmed out. To this day, I have never understood why hobbyists farm out many of the components of their cars to others instead of rebuilding them in their own shops or garages. No option, output shaft has to be changedĢWD TH350 output shafts are not useful for 4WD applications, the output shaft needs to be changed.Having been a dedicated muscle car enthusiast now for the better part of my adult life, I can say with no exaggeration whatsoever that there are few things more enjoyable that being able to work on your own car or truck and get perfect results from your efforts. Output shaft sticks out ~2-1/2”: This one was used with NP208 transfer cases in the early 80’s.ĭrill/tap six bolt transfer case pattern into face of NP203, plug up stock holes and make a tab to hold down the idler shaft Use factory TH350/NP205 adapter HERE and drive sleeve HERE ![]() Use factory TH350/NP203 adapter, very common Output shaft sticks out ~7/8” from the back of the case: This is the most common version and is the output that came mated to either an NP203 or NP205 transfer case. There are 3 versions of TH350 output shafts, all are 27 spline:
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