We used the compound provided in the gear kit.
We applied it on the Ring gear. I don't think we let it sit too long. I used the Ford guide to compare patterns and ours was dead on the first time we checked. We did measure backlash first and obviously pinion pre-load. We re-used my pinion shim as well from the 3.27 set (I put in 4.10s).
Yours looks like it is contacting well on both gears. I'm no expert by any means so hopefully someone else chimes in for you. How does it compare to the Ford Guide Gear Pattern? If you need me to, I can find a link to that install guide I used...let me know.
My gears have absolutely no whine at all. Been going for about 10-15k miles now and down the drag strip several times.
Matthew 26:52-54 / Go Pack Go!
2001 GT Convertible - Cammed, Geared, Slow
1994 V6 Convetible - Stock
2009 Malibu LTZ - Stock