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Discussion Starter · #1 ·
1990 W250 with 5spd. what should i be using?

before i get flamed for the "search" function, i searched "diff fluid" and got 11 pages and went through every one. so much conflicting information. some say 75w90, some say 80w90. what do the 1st gen experts use?
 

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No problem, thats why the site is here!

I should note that a limited slip diferential was availible on these trucks, so a gear oil rated for limited slip, or an additive may be necissary.
 

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Go to your local driveline shop and they should have the dana/spicer additive

I use Lucas 85/140 extreme service in the rear on mine and 80/90 on everthing else except the tranny but my truck is also a sled puller
 

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Discussion Starter · #6 ·
topped up with 80/90 last night because i had the axles out for parking brake cable replacement. everything is fine now but i couldn't believe the hack macguyver job the last guy did on my truck before i bought it. so i guess he fugged up the lever that the cables attach to inside the drum....on both sides so he dicided to WELD the cables to the lever in a taco-shell shaped 3/8" sleeve! ridiculous.
anyways, the diff took a full litre of fluid after the axles went back in. drove fine, no noise. thanks again guys.
 
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