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In the last few weeks, I've had problems transferring/withdrawing LTC from exchanges such as Huobi Binance and Yobit to name a few, to Coinbase/GDAX. The problem is that these exchanges have not upgraded their litecoin wallets. If you're also having this problem, I've found a fix at https://litecoin-project.github.io/p2sh-convert.
Just copy you address from gdax, which should start with a "M" and goto https://litecoin-project.github.io/p2sh-convert and paste the address from gdax into field that say "P2SH Value:" and click convert. Then copy the address provided, which should start with a "3". Use the copied address to send to and you're done...