:-? Your transcription shows the liaison - so which do you believe? Here's what I believe. More often than not the d is dropped: /ju: ǝn ai/ . However, 'You and I' is often used in a consciously correct way (avoiding /ju: ǝn mi:/ ), and in such cases the /d/ is clearly articulated; often, the /ai/ is often preceded by a glottal stop (so that, while transcribed word breaks, in a broad transcription, are largely conventional, the /d/ is clearly appended to the /ǝn/.
You'll have noticed that I always reduce the /æn/ to /ǝn/. I'd say that the open vowel is used chiefly when there is contrastive stress: 'You and I need to work on this.'