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Discussion Starter #1
When I installed my lockright in the rear of my 86, the manual for the locker said to use 85w140, which is what i used. I dont know if it is from the real thick gear oil, or a combination of the oil, new 31 muds, and locker; but my gas mileage has gone from 330 a tank, to 230-250. I realize there is a slight difference in the speedo now, but only a few %. Will changing the gear oil to 80w90 effect the mileage at the cost of increased noise, or should I just leave it. I live in AZ, so the temps are higher than other places if that changes anything.
 

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I have ran 80/90 in my 44 for 2yrs now and my locker is a little noisy but I have had it apart a few times and it isnt worn at all anywhere. I live in Washington so the temps are mild but I would imagine you should be fine. As far as mileage I have never heard of oil viscosity effecting gas mileage Are you heavier onthe pedal because of larger tires? The stock 4.10s should be low enough for 31s.
 

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lots of factors can decrease your mileage.
if you didn't change gear ratio's, your truck is working harder to turn a larger tire, and the added lift increases drag, ect.

i'm using Morie's stablizer in all the boxes in the truck, and it's like jelly compaired to 80/90w. it's made a big difference in temp. i've got 70/30% Morie's/gear oil mix in the diff's, 50/50 in the tranny and t'cases. the shifting improved dramaticaly!
mileage has not changed.

hope to see ya on the crown king trip!
 

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330 miles out per tank. You must of been driving down hill with a tail wind <IMG SRC="smilies/biggrin.gif" border="0"> I'm always around 220 if it's just city driving.
The only noise you'll get is in corners and then you'll only hear it in parking lots. It's part of having a capable wheeler, I'm suprised you got muds, they make noise too.
 

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Originally posted by Clifton:
<STRONG>330 miles out per tank. You must of been driving down hill with a tail wind <IMG SRC="smilies/biggrin.gif" border="0"> I'm always around 220 if it's just city driving.
The only noise you'll get is in corners and then you'll only hear it in parking lots. It's part of having a capable wheeler, I'm suprised you got muds, they make noise too.</STRONG>
i'm lucky to get 18 in the city! what wrong with your truck. it must not like gas!
<IMG SRC="smilies/crybaby2.gif" border="0">
 

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Discussion Starter #7
Originally posted by Arnold:
<STRONG>He must have a big a$$ gas tank. <IMG SRC="smilies/biggrin.gif" border="0"></STRONG>
I am serious on this one... My old 85 got 250 or so with 32s and 4.88s. I have to run it til the fuel light is bright, but it does, well did. Thanks
 

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my lockright is working great after several thousand commuting miles and mild trails. i use a combination of 80/90 and water that seeps in from the deep water crossings above the diff breather and computer.. <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/thefinger.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 
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