Gorillaxj

^ exactly...

uplndvpr

So i didnt use shackles i rebuilt some sagging springs with a add a leaf and it started making this noise, but as to the angle ill take some pics and upload.them so you guys can take a look.

Thanms for all the help guys

uplndvpr

ok so here are the pics
na dby the way i dont have a 4x4 but is it possible that the slip yoke is just old and has started have excessive wear, i know i need to replace the rear seal ....

jeepsurfer1

Perhaps there is pressure on the tc from the shaft and its causing the chain to rub...

uplndvpr

no transfer case i have a 2wd cherokee but maybee that could be a problem the fact that the shaft is at a different angle and is putting stress on the rear parts of the transmission

any other ideas

jeepsurfer1

Wow I have no idea I don't know if you can even do a sye, maybe a hack and tap? Idk... Confirming though you swaped your 35 for an 8.25? Right

uplndvpr

nope the jeep is a stock 1998 Jeep Cherokee SE with the 4.0 auto tinted glass and no antilock brakes and the chrysler 8.25 rear end with 3.55 gears
all i have added were some flat springs that i added a 2 inch add a leaf to and some spring boosters to the front to lvl it out some

oh and some stuff under the hood but thats it and now it gronds for some odd reason

JeepDeep

From the pictures it seems like your pinion is pointed up a little too much. You need to put an angle finder on both yokes to rule it out for sure.

LaredoBucket

I did a 35 to 8.25 swap in my 92, 5 spd, XJ. The donor was a 96/97 and it works perfect. Could possibly be your lift/height causing your U joints to max out. How many inches does it sit at now? I only have a 3" RC lift, but I have 32's on her and it sits pretty nicely with no noise. I'd like to go another inch & a half higher as well, but I figured I'd need to do a lil more researsh since the driveshaft might need to be extended or moded.

One more thing!! Did you use the U bolts from your old axle or the 8.25?? You should be using the U bolts from the 8.25.

jeepsurfer1

Was that 98 (doner) a 2 wheel drive as well?

uplndvpr

ok so just to recap

1. I have a 2 wheel drive 1998 Jeep Cherokee with a 8.25 from the factory
2. I was an idiot and put a 2 inch add a leaf in some flattened out leaf springs
3. It grinds and makes noise

so what i have done since last post

1. Put in new u joints and rear trans seal

It still grinds ..... what was the comment about pinion angle
and also i was wondering if it sould be a bearing or something else in side the differential ??

by the way the u joints were factory original and the jeep has 215 k miles so they were worn out to begin with

but i did figure out the sound doesn't start at all until i reach 35 mph and it stops when i fall below there but on the highway going about 65 mph it gets kinda loud and annoying "roaring" if you will ... dont want to have to park this thing its my daily driver and it gets better gas mileage than my other car so .....

Any ideas or help greatly appreciated
thanks viper

Edit : the truck was only lifted about half an inch over factory ride height in the rear and about a quarter of an inch in the front as measured but who knows the thing has some miles

jeepsurfer1

I have an odd idea guys, what if the chains loose could it rub the inside of the case At speed and cause the noise? If its not posable explain please

grsmnky1

Use a longer yoke from a yj. Your yoke is partially disengaging from the transmission most likely on hard stops and deep whoops in the road. Drop the tranny mount to help with the angles.

jeepsurfer1

Was the problem fixed...
Bump