If your turbo 350 won't downshift, try the adjustments and checks in this video. It is usually a matter of fine-tuning to get the downshift mechanism working properly. Downshift cables vary widely by application, so no links can be provided. Here are some tools and products that will be helpful:

3/8" Drive Socket Set https://amzn.to/3Fk99yH
Filter Kit (verify fit to your vehicle) https://amzn.to/3TLVMeK
Synthetic Transmission Fluid https://amzn.to/3TCVuqH

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