tuff99

how much 75w90 should I use

sycoglitch

wait so you have stock control arms and a sroxk trac bar. **** the alignment please don't tell me youre just lifting and not properly changing parts

And this is meant to be all CAPS. Im yelling

NewKindOfClown

Told him in the other thread..

Bacchus

Apparently the ring and pinion in my 8.25 are not aligned properly, therefore wearing incorrectly. Could that cause bad mpg? Getting like 10 mpg on 31's with steel rims and 3" lift
I know I should change plugs, wires, Cap and Rotor for now. Anything else I should be aware of?

Turbo X_J

^
Post up a pic of the wear pattern.

sycoglitch

I saw. I didn't feel like posting twice lol.

salad

I don't remember which axle you mentioned but front axle buy two quarts, rear buy three. Fluid capacity charts all over the interwebs.

Doubtful. Lots of maintenance to be done regarding mileage... which transmission and gears do you have with your 31s, and how are you calculating mileage?

Year is very important to know. 1999 like in your profile?

n91chriss

Not that, the stuff next to the firewall passenger side, three or so color coded plastic vacuum lines, blue, red, yellow, etc. One goes down to the t-case, one to some sort of selenoid down by the blower motor along with the black w/ red wire, I'm 90% that turns the light on in the cab PART TIME. I'm just going to reverse engineer it, shouldn't be too hard, and put in flexible line.

cruiser54

I just eliminate the vacuum source and all the lines and do this:

https://www.cherokeeforum.com/f51/fr...ss-91-a-38629/

n91chriss

Does it affect milage? I don't mind the vacuum situation, 2x4 gets me pretty well wherever I want, I need to regear anyway, I'd like a 3.08-2.42 gear situation, and I may have to swap the front out anyway, the dana isn't going to like what I plan for it.

Anyone know what breaks when you throw to much at the axle?

salad

Oh that junk. Yes, get rid of the vacuum disco. In theory it affects mileage but nobody who's eliminated notices any difference. The factory stopped adding that unreliable crap partway through 1991 model year.

Why do you want 2.42:1 gears in there? Do you have a monster diesel or is everywhere downhill? 3.07:1 came stock for 4.0L gas and 2.5L diesel XJs with manual transmissions.

1991Jeep_Man

I loved my axle vacuun disco so much that I ripped it out and cuddled it all the way to the dumpster during the snow/freezing rain it decided to fail me on!

Confirmed no mpg loss with the disco eliminated. My 91 was lucky enough to at least have a balanced driveshaft with the disco so no vibes. Its nice to be able to throw into 4x4 and go with no worries.

As far as 2.xx gears, Hell I have a 1.25 gears! Traded my 4.0 and trans for some bike pedals. I have solid 'buns an ties'! Gets me everywhere!

n91chriss

You boys are hilarious, do you not ever use lowrange? I want decent highway gears, no I don't have a diesel, I'm going to run 16-18 psi supercharged and I would like to get 25 mpg, I already have more torque than I'll ever use in 4 low, I'm bumping up to the '99 manifold and comp's most agressive cam. I don't think I need a 5.15 rearend like you 2.5L guys. I have a 3.55 rearend currently because I had the aw4, and I redline it at 35 mph in fifth in lowrange.

1991Jeep_Man

Can't tell if serious...

Edit: I'm going to expand on this post... why are you running in 4low at 35?

NewKindOfClown

I second this question.