Hey Guys, im literally about to buy gears TODAY. I had done research and havent found but one place that sells 4.88s for a C8.25? Its Yukon Gear and Axle. I just want to make sure its actually doable. Ive heard that you can't fit these big of gears in this axle housing. If so I am gonna purchase them.

 

You mean this r&p?
I'm working on the same project now, so far "yes"everything is fitting.

Not done yet though.

There's definitely a issue with the diff. case center pin, something or "some things" will need modification

Yukon's tech line says they fit. Even with the Aussie I'm also installing.

But yeah, I'm still pounding out the details.

 

Awesome keep me updated with all the "modifications" needed to do to ensure proper fitment! Thanks!!

 

I don't see why not. The ring gear is still the same diameter. Cover issues maybe?

 

Yeah it looks good so far, everything is fitting.

I keep getting side tracked reading Cherokee Forum while working on this project though, bwah!

Almost done with the tear down and cleaning.

I think the cover will be ok, the 4.88 is around 3/16ths of an inch thicker than the 3.55.

Grinding a gear tooth to get the center pin in worries me because I don't want to get into the gear pattern on the ring when doing this. You see what Yukon says is needed.

I haven't been able to mock anything up yet though to see how it will all play out. Some of the parts are all still "stinky", covered with gear oil and all. This stuff has been together for almost twenty years, it always stinks.

I got my gear set from Summit. G2, USA gear and I think one other makes 4.88 for the 8.25 besides Yukon, however I think there all sourced from the same manufacturer in... China. None of the descriptions from any of the companies on Summits website states "Made In USA".

I'll keep everyone informed about any issues with the install. It would be great if anyone who has completed a 4.88 r&p into the 8.25 had any insight.

 

Where you grind should be the high side of the tooth, and it better not be in the pattern, or you have other issues.

It shouldn't be much either...on my axle, it was ~ 0.030"

Your tooth pattern should be in the general area of the black smudges....the area you need to grind for clearance is the red......they should not even be close to interacting with each other.

 

Of course you can fit 4.88s in a Chrysler 8.25 or else they wouldn't make them. The only thing you will run into is you will have to grind some off of one of the ring gear teeth to get the cross pin in.

 

I think everybody knows where we are grinding, but.....

Why does it say "grind center pin for c-clips" on the label.

Imo, grinding the center pin is the same as putting a flat on a bolt.

It still threads in, may not be as strong but...

If your using a lunchbox the spiders are eliminated, which means the center pin is only there to keep the axle shafts from moving inward towards the center of the vehicle. it doesn't need to be as strong because it's not supporting the spiders.

 

A notched center pin won't work with a locker, I just watched a you tube video from Randy's.

I'll post up some pictures of grinding the ring gear on a Brown and Sharpe 618 soon!

Hope it's not much clearance that is needed.

 

Now ya get what I have been saying all along.................


Now, test fit the ring gear in every possible bolt hole combination to minimize the amount of the tooth that has to be ground before machining it.

 

I'm working on it, I'm outta high speed data.

Too many pictures!

 

 

What bearings come in that kit?

 

master install. everything

 

Did they come with Timken or Koyo bearings?