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Hello, Eddie here and I will do my best to help. Do you know what code or codes it is setting by chance? Apprixmate mileage on it, and has the tranny ever been overhauled yet? or out? Thanks.
Alright, It's interesting that it shifts fine cold, but warm it locks into 4th and won't downshift. If you can check the codes, it'll be like a code that starts with a 7 like PO735 or PO745 something like that. Any generic OBD II tester can get the codes out, that would tell me alot, if there is shift solenoid codes, or communication errors. I believe it to be in the valve body/ECM control. since it does have all of it's gears cold. Is there any possible way you can get me the codes?