Dealer said my CV boots were split on my 98 Accord, so I went to a reputable
independent shop to have the CV axles replaced with new non-OEM
units. They drove fine until later backing out I noticed the front
end making a sharp pop, snap, or knock noise on a sharp turn with
acceleration. It doesn't repeat, it just sounds once or twice on the
acceleration.

I looked under the car and from what I could see of the outer CV
boots, they looked sealed and fine. Are the boots breaking in or do I
need to return to the shop ASAP?

Thanks.

solved:

the noise comes from the tranny when shifting from forward to reverse or vice versa. supposedly, that's due to normal tranny wear.

 

I would be concerned, especially since you make it sound like this just started happening. I drive a couple accords (one auto, one standard) and both have over 210k miles and neither make any weird noises when shifting between reverse and 1st. There are another 3 accords in my immediate family and none have this issue. I've replaced the driver side CV shaft in my accord and the rebuilt unit started clunking after about 1000 miles. It simply was a poorly rebuilt unit and I exchanged it for a another one under warranty and have had that one on for probably 20k miles with no issues. If I were you I would get a 2nd opinion or go back and complain if the noise wasn't present before this work was done.

 

Check and make sure all the nuts and bolts on suspension parts are tight. A lose swaybar bolts makes loud noise. Also check your motor mount. Bad motor mounts makes clanking noise when the trans shifts. Specially, from P to R then to D. It's not noticeable when you're cruising because of the road noise.

 

I think I have the same problem, there is a loud pop., and it feels like it's under your feet no?