View Full Version : Grinding 4:10 ring teeth to fit onto Torsen carrier yea or ney

08-17-2012, 10:45 PM
Baught some used 4:10,s from eBay. Price was right $75.
Listing said they were removed from a 2000 s-10.
Installed some new bearIngs on the pinion and set it up in the housing.
Took the ring gear out of the box and found it to have 7 teeth ground down .
Which made my torsion block slide in super easy.
Grinding the ring gear does not sound like a good idea to me..
Car is stuck on my lift at work I don't know if I should put these in. Or if I should buy another pinion bearing and reinstall my old gears
Any way messaged the guy I baught the from and this was his reply

"This e gears were removed from a 2002 camaro and it had a torsen GM posi unit. There is NO other way those 4.10 and stepper can be installed on a torsen type posi as it has a BLOCK NOT a round rod slide pin like a auburn open or eaton unit. Should not affect the run as it was from a running car. We installed the factory 3.73 back into that car as he was selling it.

As long as there is no sharp flashing at the top of the gear..which it appeared when it was packed DID NOT you should have not noise. But we also did not drive the car before we removed it. Jim JD RAce"

Car has to be off my lift by Monday before I start work....
Any suggestions

08-17-2012, 11:02 PM
actually, people grind down the paddle ("block" pin) as opposed to the teeth on the ring gear. Supposedly some companies make the 4.10s with the teeth cut on the inside so you don't run into this issue (i've never seen them)

either way, used gear sets aren't known for lasting. Once you have a set broken in, changing the pattern in any way just wears them prematurely.

08-17-2012, 11:06 PM

08-17-2012, 11:44 PM
That seller was an idiot for not thinking to grind the paddle instead of the gear. However, I have seen the teeth filed for this reason before and the gears are still in service today....

08-18-2012, 01:37 AM
Grinding the gear or using a notched paddle or a notched crosspin are common practices when there is an interference.