Another question.. what weight oil in differential??

[XHitman396]

so what weight oil should i put in a 14bff and my 10 bolt front?? Ive never even bought any before, and the guy at the parts store triple guessed himself. so, whatcha got?? thank you..

 

[readymix]

80-90w

 

[sled_dog]

I always just use 80-90 as well

 

[MTChevy]

regular old 80-90 in an open diff is what i use

 

[muddybuddy]

i use 80-90. some guy who claims to build rock crawlers says that 80-140 or something works better in diffs with lockers. i duno if hes right tho.

 

[sled_dog]

70-140, its synthetic gear lube. thinner, Mazda/Ford use it in their tcases(the Ford Escape/Mazda thinger). Yeah I say use 80-90, nothing wrong with it in any instance, just use limited slip additive when you have a limited slip diff.

 

[Pookster]

check and see, most 80/90's have LSD additive.

"consider" 140 if your going to be towing in hot weather. Synth is good, but if you play around a lot in water/mud, you'd be changing it all the time anyways.

 

[muddybuddy]

so if your plannin on taking a 275 mile trip each way to the beach, it prolly would be best to put in the 70/140 synthetic right? i just finished the break in period for my yukons/detroits so i need to change the fluids anyways.

 

[resurrected_jimmy]

I'd stay with 80/90 the biggest reason for going to a higher weight oil is heat. If you aren't building a lot of heat in your diff (like when you do towing) just run 80/90

 

[jekbrown]

for a light-use rig / DD, what would be the best synthetic to use? My ranger has a tiny diff.. couldn't take much fluid and it hasn't been changed (as far as I know!) since it was built in 94...

j

 

[muddybuddy]

I'd stay with 80/90 the biggest reason for going to a higher weight oil is heat. If you aren't building a lot of heat in your diff (like when you do towing) just run 80/90

a long road trip would build up alot of heat right? would puttin 70/140 eliminate the need to stop frequently to allow it to cool down?

 

[resurrected_jimmy]

I think 80/90 is fine for your use. If you are having to stop to let your diffs cool then something besides gear oil is very wrong.

 

[muddybuddy]

alright cool. well i only mentioned frequent stops because it was advice that was given to i believe it was avery bout driving like 200miles to the beach in cali.

 

[sled_dog]

if you gears are fully broken in, there should be no need to stop all the time. Now if they aren't done the break in period, yeah giving it a break is a good idea.

 

[Smitty]

So, is there any reason to not run 85W140? The manual for my Detroit says to use mfg recommend oil (80-90). The manual for my Lock-Right says to use 85-140 to reduce the noise. Figured I'd just go with the 85W140 in both since I'm in sunny Florida.