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The Terminator
Driveline
irs leaking dime size puddles
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<blockquote data-quote="RedfireSVT" data-source="post: 13168555" data-attributes="member: 36200"><p>75w140 is what is recommended in the manual however if you live in a colder climate 75w90 might be a better choice. i noticed you live in illinois so thats why i suggested that weight but either one will work just fine. i have used permatex black plenty of times with zero issues, however, the ford black or grey (which i believe they use on trucks) is as mentioned probably the best option going, that stuff is heavy duty. not sure on the price, it's probably more expensive and you will have to go to the dealership to get it unlike permatex that can be bought just about anywhere for a few dollars. also, royal purple does add friction modifier to their gear lube but i always add about half the bottle of the ford friction modifier as well. this is just my personal experience and preference and has worked well for me.</p></blockquote><p></p>
[QUOTE="RedfireSVT, post: 13168555, member: 36200"] 75w140 is what is recommended in the manual however if you live in a colder climate 75w90 might be a better choice. i noticed you live in illinois so thats why i suggested that weight but either one will work just fine. i have used permatex black plenty of times with zero issues, however, the ford black or grey (which i believe they use on trucks) is as mentioned probably the best option going, that stuff is heavy duty. not sure on the price, it's probably more expensive and you will have to go to the dealership to get it unlike permatex that can be bought just about anywhere for a few dollars. also, royal purple does add friction modifier to their gear lube but i always add about half the bottle of the ford friction modifier as well. this is just my personal experience and preference and has worked well for me. [/QUOTE]
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