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Username Post: Do I have too much play in my differential ???        (Topic#45627)
Kevin Keinert 
Senior Member
Posts: 201
Kevin Keinert
Age: 54
Loc: Santa Maria, CA.
Reg: 09-09-03
09-25-03 03:36 PM - Post#306716    

Hi all,
I have started to replace the leaking pinion seal at the front of the differential on my 56 V-8 265 w/Powerglide. (See my previous posts). With one rear wheel lifted, I removed the U-Joint and placed the drive shaft to the side. I then put a torque wrench on the pinion locking nut to test the current preload on the pinion shaft before I removed the companion flange (the yoke) and the oil deflector (I also marked everything as suggested). While turning the locking nut I noticed that I have some freeplay or backlash when I change directions. To describe how much play: if I rotate the yoke in one direction, stop and then go in the opposite direction, the outside diameter of the oil deflector will rotate about 1/4" before the lifted tire starts to spin again. Does this sound like too much play? I know there should only be .006" to .009" backlash between the pinion gear and the ring gear, but I'm measuring through all the differential gears and the axle. Any thoughts? Thanks, Kevin.

 
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Anonymous 

Re: Do I have too much play in my differential ???
09-26-03 12:19 AM - Post#306717    
    In response to Kevin Keinert

HI Kevin,

I would say with the .250" of rotation, that the backlash is definitely outside the spec.

This is rather common on these rears.

You can readjust the backlash, but you will need to remove both axles and the differential assembly.

Is the rear noisey? If not, then I would leave it alone.

 
chevy1955 
Senior Member
Posts: 169

Loc: Panama City, FL.
Reg: 08-08-03
Re: Do I have too much play in my differential ???
10-03-03 04:36 AM - Post#306718    
    In response to Kevin Keinert

Your observed backlash is a combination of the ring and pinion back lash AND differential side gear to spyder gear backlash. The majority of what you are seeing is the side gear backlash, this is common on the non-posi 3rd mbrs. To accuratly adjust ring and pinion backlash, the 3rd mbr will need to be removed and a dial indicator placed on the ring gear. With the pinion held stationary, rock the ring gear back and forth to observe true ring and pinion backlash. .005 to .008 is the factory recommended backlash. If you desire, with the 3rd mbr out, place both axle shafts into the differential. With someone holding the other axle stationary, slightly rotate your axleshaft and look into the guts of the differential and you will see the side gear to spyder gear slop (Back lash). If the 2 side gears and 2 spyder gears are in good shape, I wouldn't worry about it. Its important to remember that all the power is transfered through thoses little gears (side and spyder). There are shims available to tighten up these clearances if it is excessive.
By all means, do not over tighten the pinion yoke nut! Bearing and gear failure will occur if proper R&P back lash is not correct! Remember, as the rear end gets hot, tolerances change. . .don't get your rear in a bind.

good luck
Steve Snell 55 Belair 2 dr post, 396, T56, 4.11


 
Kevin Keinert 
Senior Member
Posts: 201
Kevin Keinert
Age: 54
Loc: Santa Maria, CA.
Reg: 09-09-03
Re: Do I have too much play in my differential ???
10-03-03 06:10 AM - Post#306719    
    In response to chevy1955

Thanks Steve!
KK

 
WSSmolin 
Super Senior Member
Posts: 5002
WSSmolin
Reg: 01-25-01
Re: Do I have too much play in my differential ???
10-04-03 01:20 PM - Post#306720    
    In response to Kevin Keinert

I just adjusted the backlash to within spec on my open 3.70 rear and installed it and with the wheels on the ground, a point on the outside edge of the pinion oil deflector flange does not move more than 1/8" from lock to lock.

Wyatt
'56 210 Townsman wagon 6cyl/3spd OD | '58 Impala Sierra Gold 348


 
Anonymous 

Re: Do I have too much play in my differential ???
10-04-03 02:21 PM - Post#306721    
    In response to chevy1955

Quote:

There are shims available to tighten up these clearances if it is excessive.





REALLY???

There are no shims in these rears. The backlash is adjusted using the large cap nuts on the differential main bearing caps.

 
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