4.88 9" install...GRINDING?

chasespop

Active Member
Joined
Mar 21, 2005
Location
Clinton
I'm installing a set of gears in this third member. The ring gear is contacting the pinion support before the backlash even gets close. Grinding the toe or the pinion support, seems to be only way to get the backlash right. The pinion depth seems to be good.

I've seen some sites that suggest this process with low gear ratios. Anybody done this?
Thanks
 
I've had to grind a bit on a housing or two to clearance the ring gear. I've also seen the ring gear chamfered. I would remove just enough for good clearance and make sure you clean all the shavings.
 
Ratman said:
Isn't there a carrier split on the 9"?
Click to expand...


I don't think so.

I would grind the support before the ring gear.

Sam(slim)
 
IF you are gonna take any off of the ring gear it needs to be turned down on a lathe. I don't recommend a grinder. Marking the areas that need clearanced and taking it to a machine shop and have them mill it out seems to be the best idea.
 
I had to clearance the pinion support of a 4.11 setup once. I was told to do this from an old timer. He said it was a very common practice for 9" rears. I used a small angle grinder.
 
upnover said:
IF you are gonna take any off of the ring gear it needs to be turned down on a lathe. I don't recommend a grinder. Marking the areas that need clearanced and taking it to a machine shop and have them mill it out seems to be the best idea.
Click to expand...

Isn't the ring gear hardened? Wouldn't that be a bitch to cut on a lathe?
 
Yes, you need to grind out the pinion support to clear the gearset. It is a known issue on the 9" with the deeper gearsets........ Not a big deal, just grind it down a bit and you will be all set.

Andy
 
Caver Dave said:
Isn't the ring gear hardened? Wouldn't that be a bitch to cut on a lathe?
Click to expand...
Yes, and yes.

I have a friend in Boone who does this to 14 bolt's so he can shave more off of the housing for ground clearance.
 
It all depends on which case you have There are about 4or5 different 3rd member cases for a 9 inch. I have installed as low as a 6.20 gear in 9 inchs you just have to have the right case
 
Back
Top