I too, am confident certain about my pronunciation of gēat, which shall remain /jǽat/.
But I'm inconsistent with g before æ.
In my quest to plug this hole in my pronunciation, I consulted First Steps (which should have been among my first actions). Interestingly it was /g/ before y unless that y came from earlier ie. So, gyfan > giefan has /j/, but gyden and gylden have /g/. I've always pronounced them with /j/. Wrong!
Hurra! I found the answer I was looking for and valuable information that I was not looking for.
But this sets my cranial integuements abuzz with questions. Why was g palatised before simple æ but not a diphthong that started with æ? Does the later vowel push that g back to the soft palate, or did the 'ea' start with an /e/ at some point, wreak its havoc upon the g before retiring to the middle of the mouth. Or is it just one of those things?