489 suregrip. Thrust button missing?

[Moparnocar]

Putting new axle bearings in ( not green). I read the trust button pin breaks, I don't see any, what's the deal?

 

[Moparnocar]

Photo

 

[Moparnocar]

Also, how hard should it be to turn the gear set out of car? I can't do it by hand, but could with drive shaft connected

 

[R/T Boy 67]

Cone type sure grips have a thrust spacer, and it looks like it is there. You should be able to turn the pinion yoke by hand.

 

[Moparnocar]

Cone type sure grips have a thrust spacer, and it looks like it is there. You should be able to turn the pinion yoke by hand.

I can,only by getting it going using a screwdriver, then turns good until I stop, I could be weak...

 

[Moparnocar]

Also, supposed to be 391, this is the only marking I can find

 

[R/T Boy 67]

Does it have any backlash?

 

[Moparnocar]

Does it have any backlash?

Not really, but teeth look ok

 

[R413]

Is this new or used? Turn it over and count, one turn of ring gear equals 3.91 turns of yoke. A 3 year old should be able to turn it by hand. if not something is wrong. If no backlash then don’t bother installing it.

hold yoke and see how much free movement of the ring gear. .006-.010 should be there

 

[velocityss1985]

Or the pinion preload is too tight. They are only supposed to be around 20inlbs or so (don't have the manual in front of me) turning torque. As just mentioned a 3 year old could turn it.

 

[RemCharger]

Looks like 3.91 by the ring gear size.

 

[Moparnocar]

Ugh, a 3 year old could not turn it, looks like I'm going to 355 sooner. No idea how old, just bought the car

 

[69Bee]

Look at the driver side of the case and you should see a single large number. A "2" is for a 742 case, a "9" is for a 489 case, and an "X" is for a 741 case. These numbers also are the last number of the casting number near the bottom on the same side.

Edit: Added X for 741; I forgot it

 

[R413]

Look here for the 9

 

[66Satellite47]

Turning the U joint yoke should be easy with one hand. In order to get a good pattern check you need to put friction on the ring gear. My guess is too tight pinion bearing.

 

[440 4 speed]

The ring gear is stamped with the ratio.

 

[66Satellite47]

Aftermarket gear sets are not always stamped with the ratio. The marking in the pic sure looks aftermarket to me.

 

[69 Sleeper Bee]

Looks like they wrote the backlash on the ring gear. Now whether that is what it is set up as now or what they wanted it to be is the question.

 

[Moparnocar]

Look at the driver side of the case and you should see a single large number. A "2" is for a 742 case, a "9" is for a 489 case, and an "X" is for a 741 case. These numbers also are the last number of the casting number near the bottom on the same side.

Edit: Added X for 741; I forgot it

It's a 489

 

[Chi Town Runner]

Aftermarket gear sets are not always stamped with the ratio. The marking in the pic sure looks aftermarket to me.

Count the teeth on the ring gear then count the teeth on the pinion
Divide the ring count by the pinion count.
100% accurate - no guessing