I have a 9 bolt w/3.45 gears. When I turn the car left, it works great. I mean the car will get sidways in a hurry. The problem is when I just take off straight, or turn right, the right wheel is the only one pulling. I can't go around just turning left, so I need help fixing it. Here are some more problems. It whines when I'm accelerating. If I let off the gas the whine goes away. I can move the left side wheel in and out about 1/4". The right side is solid. I don't know if this is the problem or not. Thanks for the help.

 

Either you don't have posi, or it isn't functioning. A non-posi car can do 2 tire burnouts part of the time--especially turning left. Without posi, the right rear tends to want to do the spinning. So when you turn right it gives it more reason to do all the spinning--less weight on that tire. You may be able to 'shim' the posi. Do some searches.

 

I did the search, I just couldn't find anything. What about the tire moving from side to side? Is that normal? Could the axle be sliding in and out of the diff enough to make the teeth slip? I know it is a posi rear. Thanks

 

Change the diff. lube. And make sure to put some posi additive. If your sure it is a posi anyway. THe old fluid inside is probably gone bad or broken down. See if that fixs you up. HTH

 

I've already done that too. I took out the right axle, checked the gears. Everything looked good. I did not remove the left one. I think my bearing is shot. I'm not sure though. When I put everything back together, I used new oil with the additive. Same problem!

 

Are you able to post a picture of what your posi looks like??? It would make it easier. Find your RPO sheet and post your findings. THis way we can tell what gears and carrier you have.

 

I don't have a picture or anything. I know it is a borg-warner 9 bolt posi with 3.45 gears. That much I know. It isn't the open differential, it has 9 bolts on the cover, it has a tag on one of the cover bolts that is stamped 3.45, the ring gear says 3.45, there is no c-clip, the axle is bolted to the housing, and it has beveled axle bearings. I just don't know if the axle sliding in and out will affect the posi when I turn right. you know, maybe when I turn the axle might push in to the diff too much? Thanks

 

What kind of milage are we talking here. It may need to be replaced or rebuilt.

 

Kruzin, thanks for the help,
It does have allot of miles, 177,000. I am looking into rebuilding it, but I was just wondering why it works right 100% of the times I turn left, and never works anyother time? Hopefully funds will allow a rebuild of the rear soon. But for now, I just want to leave some stripe(s)!

 

Yeap sounds like a rebuild to me. Glad to have been of some help to you. Get her fixed, and let her GOOOOOO!

 

I had a similiar thing happen with my old 9 bolt. Most of the time I'd spin both wheels, and sometimes both would spin but one would stop.
And I don't think the 9 bolts need the posi additive since there are gears in there and not clutch packs.
On a 10 bolt without posi additive the rear end will make a clunking sound when turning, my brothers rear did that since we didn't have any posi additive at the time we changed fluids.

 

<b> I know it is a borg-warner 9 bolt posi with 3.45 gears.</b>

then the clutch thing is gone bad. mine is the same way. 9 bolt... one day posi... next day... *shrug* its too expensive to fix so i just went to a 10 bolt. they are weaker but much much cheaper. i can build up 2 10 bolts for the cost of a somwhat stronger 9 bolt. not worth it, in my book. I know 9 bolts are cone type clutches, and im pretty sure you cant just replace the clutch, you gota buy a new unit. but i dont know for sure 100%. Somone else will come up with that answer for ye.

 

If the housing are not trashed, you can install new posi cones. Otherwise you need a new posi unit.

Everything you need for a 9 bolt is at www.9bolt.com

Miles
Diff Solutions
www.9bolt.com

 

Okay, I have this 10 bolt rear w/drums from another car. Can I put on 10 bolt brake disc backplates and use the 9 bolt calipers? Just long enough to rebuild the 9 bolt, so no perminant swaps. I don't really care about the 10 bolt, so mods to it are not out of the question. Thanks

 

Hey Miles how much would it cost for 3.45gears (new or used) a new posi and the installation kit for the 9 bolt? becuz i got a 9 bolt but it has 2.77 gears and the posi works fine (while out of car). i just wanna know how much it will cost to upgrade my rear end, becuz i wanna use the disk brakes but dunno if i wannna spend a crap load on the gears, new posi, and installtion kit. yea know

 

you can shim the cones to make it tigher. read the article in the tech section.

 

where is a good place to get the shims?

 

Just adding shims is only a temporary solution and does not fix the real problems!

I will have complete posi rebuild kits (posi cones, shims, spring pack, etc.....next month. Just trying to finish the details now. I will also be offering rebuilt posi units about the same time. Brand new posi units will still be available for maximum life and performance.

All the information and/or parts you need are at www.9bolt.com

Miles
Diff Solutions
www.9bolt.com

 

adding shims is a valid solution. Even the factory added shims if the tolerances were not within spec.

weather you add shims, or buy new cones... really don't matter. the cones are a wear item. no way around that. The more the cones wear, the tolerances loosen up.

you can mill the bottom of the cones to provide more clearance, and then add even more shims.

just my .02$

 

i used larry's fix, it works if your cones are worn. i suspect its better than new because it seems you end up with more friction area on the cones. I polished mine with a smooth file and ground out the bottoms of the cones with a carbide cutter then ground the bottom lip on a belt sander. cost me 50 bucks and a days work, i would like to buy a 12 bolt but this is 2000 dollars cheaper. Its not abad idea to properly rebuild your rear but it is very expensive. In your case it sounds like maybe one cone is worn or maybe damaged, i would take it apart and go from there.