Which spark plugs should I use for optimal performance

If my truck is a rwd, does that mean I have a front differential? I took the skid plates off and I can't find it.

Also is it true that your have to check the tranny fluid under certain type of temp to get accurate levels?

Please help me guys, thanks!!!
No rwd is 2wd only at rear wheels. Only 4wd will have a front diff
 
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