quarter note triplets

You do understand they are THREE evenly spaced notes/rests in the same time frame as 2 Quarter notes/rests...right?

If you can count-
l1&2&3&4&l

Try using something like this (or some other variation) for counting a triplet-
Hig-a-Dee

1/4 Note Triplet on Beat 1-
lHig-a-Dee3_4_l

1/4 Note Triplet on Beat 2-
l1_Hig-a-Dee4_l

1/4 Note Triplet on Beat 3-
l1_2_Hig-a-Deel

Depending on how you sub-divide, the same process can be used for 1/8th note triplets & 1/16th note triplets-
1/8th Note example: lHig-a-Dee2&3&4&l

1/16th Note example: lHig-a-Dee&a2e&a3e&a4e&al

 

Example of 1/4 Note triplets (Lucas Pickford's transcription of Jaco's "Reza")-

http://www.lucaspickford.com/transreza.htm

 

Using a vocalization works well, but I had problems feeling where the notes landed.

The solution I was given was to use a bar in 4/4 of all 1/8th note triplets.

Tap out the triplets, using both hands, on a table top so you can hear it. Start with your right hand on beat one. Keep it going for a while.

Move the left hand to your leg, so you can't hear it.

Your right hand is now doing 1/4 note triplets.