Yukon YKF9-A Master Overhaul Kit for Ford 9" Differential (YK F9-A)

This kit came complete with everything you need to get your gears setup. Good quality bearings and seals, and all the shims necessary to complete the job.

this went alot smoother than i expected in my 2k grand marquis ls with a 8.8 diff. i wish they would label the bearings on the cards just to make it easier when you go to get them so you dont have to triple check yourself to be sure you have the right set. of course that could just be me, i just triple check it so i know i dont have to pull it apart again.... the shim kit was plenty for me, and i dont know if it was dumb luck or excellent oem fitment but i was able to reuse my old shims and my pattern came out perfect first go, i do wish they would offer this kit with the axle bearings and seals along with it so you can just do it all at once with one kit. but this went so much smoother than i expected, i had a bad axle bearing that ate into my axle, that caused a bad carried bearing so i just redid it all in my driveway, car rides smooth again, no noise at all. even after 16 heart attacks i was able to do this slowly and it only took me about 5 hours with hand tools thats even pressing them on with a old bearing and a small sledge.

Never been disappointed with Yukon products. I always purchased the kits with Timken bearings and always works great.

Why did you pick this product vs others?:The best

Yukon has a deserved reputation for quality. I've used these kits for years and always been satisfied. They come with all parts needed for a typical regear or rebuild of a differential. It would be nice if they included the better carrier shims they offer, which don't require you to try and beat a stack of thin shims into the rear when setting carrier bearing preload. The good shims have two thick outer shims that interlock with the thinner shims in between them, and work really well. I always buy them for any rear where the shims are outside the bearing races. A bit more marking compound would also be helpful, especially if you don't have a pinion depth tool and have to run the setup a bunch of times to find proper pinion depth. Finally, a bit better packaging would be nice. The bearings, etc. are almost always loose in the box when I get them because they are too heavy to be held in place by plastic over cardboard alone. Nothing is ever missing or damaged, so its a pretty minor concern, but these small inconveniences and issues are why I rate this at 4 stars instead of 5. Honestly, its better than any other kit like it you're going to buy. I'll add that setup bearings can be very helpful depending on how you are setting up the gears and what tools you have. I just get an extra set of cones and grind the ID out with a carbide cutter until they slip fit. This prevents you from damaging a bearing trying to remove it if the shim under it isn't right, as most pinion bearings are basically blind pressed. If they need to be removed typically I cut off the cage and slot the inner race before splitting it with a cold chisel. Just a couple tips for anyone doing this for the first time.

Extremely high quality made in the usa parts. I've bough soooo many Yukon gear parts over the years and had very minimal part failure ( and only failures where in very high horsepower race application rigs that where taking far more abuse than your normal daily driver or weekend warrior rig would under go) there fully worth the money.

Quality rebuild kit with name brand parts such as Timken bearings. It has what you need to rebuild 8.8 rear end.

So I ordered the YK C9.25-R-B kit which is supposed to fit the '01-'10 Chrysler 9.25 Rear differential. It came in a couple days so as I began opening the box I checked the part number on the box to make sure I got the correct kit. The numbers matched so I dove right in. I started with the Carrier bearings witch pressed right on no problems. I didn't have the old ones because I had to cut them off. Next I installed the Pinion shaft Bearing (large one) after using the orig shim. Went right on no problems. I then installed the races for the pinion. The end race went in no problems but when it came to the one closest to the Carrier it didn't fit. About a half an inch bigger. So I went back to the Pinion shaft that had the new pressed bearing on and sure enough WAY TOO BIG! So I had to remove the bearing I had pressed on the pinion and figure out the right size bearing and race. By now the truck has been down for 4 days. By the time I got the correct bearing and race (which I had to buy separate) 6 days non operation. I then installed the correct Bearing onto the pinion shaft grabbed one of the crush collars out of the kit and installed it into the housing. I must have watched 10 videos on how to set the lash and crush the collar. But after removing and installing the pinion about 6 times with no luck crushing the collar I had about given up. I went back to the picture on amazon and sure enough the picture of the crush collar showed it having the hump protruding out in the middle. The 2 that came in the kit went inwards. WOW 12 days later I received the correct Crush collar (which again I bought separately) 14 days after starting the project I slid the axels in and drove the truck. Which by the way doesn't seem exactly right. Hopefully the Carrier Bearings were correct cause they and the gasket would be the only things that actually fit in the kit. The only thing I can deduct is that the contents of the kit were actually for the earlier year differential. I am going to ask for a refund and maybe the correct kit so I can possibly do it all over again with all the correct parts!