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Ok. Thanks yall. By the way, my 1028 has a SM465 4 speed manual & NP205 t-case. I love the sm465 & hate it at the same time. Been thinking about a NV4500 or 700r4 for some top end but thats way down the road.

Ok so a buddy of mine is a diesel mechanic (& a damn good one) & he builds differentials so i trust his judgment. He said if it was his truck he would use 75w140 synthetic in everything, diffs, trans & t-case. Says it has the friction modifiers i need & will be better in high heat situations...

Thats good to know. It just so happens that my truck has a sm465/np205 in it. They are also on the short list for a fluid change. Hell I may just buy a bucket of Lucas or the like & go on & do the whole truck.

Man that's awesome. Thank you! I'll pm you my info.

What will you take for it?

10-4 Thanks for taking the time to answer my questions. I've had a few square bodys but never had one w/lockers before.

I agree about not using Motorcraft but mostly because it seems like sacrilege being a die hard bow tie man. Just wondering if they were all the same stuff just branded differently. If I use something like Lucas 80w90 that is already limited slip compatible am I gaining anything by using the...

Ok. Thanks for that. So I only need the additive for my front axle. Does it matter which additive or are they all the same. So far I've seen Acdelco, Spicer & Motorcraft. I'm sure there are probably more.

After going over the LO I'm still confused about the differential additive. It says use the additive in the front but not the rear. Dosen't my truck have lockers in both ends? I have the dullay w/the dana 70 rear. Is it the same additive for the D60, D70 & 14 bolt or is it axle specific. Sorry...