My Rear Hurts

[Moparbob]

Ok,,

Heres my deal:

73 charger true rallye
440
727

How can I tell if my rear is posi and perhaps the ratio? We have not been out on the road yet but moving it around the shop it was spinning both wheels (not sure how that happened)   

The today somebody (who shall remain nameless) pulled her out of the shop and left a mark,, only one mark,, needless to say I, ah er I mean "somebody" was disappointed hoping for two marks. Anybody car to bite? 

[mikepmcs]

Repeat after me.  SURE GRIP.  posi is for the chevy crew. 

It could still be sure grip, just might be worn out and need rebuilt.

I'm guessing you are saying that you could lay two patches screwing off in the shop but when someone was pulling out it only left one mark??   Then i would say it was a weak unit.

That question above about the two patches is legit and need it answered before I can gather another response to get to the bottom of this.

[Moparbob]

Repeat after me.  SURE GRIP.  posi is for the chevy crew. 

It could still be sure grip, just might be worn out and need rebuilt.

I'm guessing you are saying that you could lay two patches screwing off in the shop but when someone was pulling out it only left one mark??   Then i would say it was a weak unit.

That question above about the two patches is legit and need it answered before I can gather another response to get to the bottom of this.

Its dark now or I would go out and black up the shop floor  but on pure speculation how could I get into this further??

[John_Kunkel]

Place the transmission in Neutral, release the parking brake, raise one tire clear of the ground and try to turn the tire. If the tire turns freely there is no Sure-Grip (or the Sure-Grip is worn out). Put a chalk mark on the bottom of the tire and also mark the pinion yoke and rear end housing next to each other. Spin the tire two full turns while counting the turns of the pinion yoke, the number of turns is your axle ratio. Example, if the yoke made about 3 1/4 turns the ratio is 3.23.

If the tire won't turn freely you have Sure-Grip. To determine the ratio raise both tires and turn one tire only one revolution while counting the yoke turns.

[Moparbob]

Place the transmission in Neutral, release the parking brake, raise one tire clear of the ground and try to turn the tire. If the tire turns freely there is no Sure-Grip (or the Sure-Grip is worn out). Put a chalk mark on the bottom of the tire and also mark the pinion yoke and rear end housing next to each other. Spin the tire two full turns while counting the turns of the pinion yoke, the number of turns is your axle ratio. Example, if the yoke made about 3 1/4 turns the ratio is 3.23.

If the tire won't turn freely you have Sure-Grip. To determine the ratio raise both tires and turn one tire only one revolution while counting the yoke turns.

John,

It ain't so sure    Jacked up the driver side and the wheel spins sorta free forward and not so free backward. What are my options here? I need the traction of both wheels!

[Moparbob]

Repeat after me.  SURE GRIP.  posi is for the chevy crew. 

It could still be sure grip, just might be worn out and need rebuilt.

I'm guessing you are saying that you could lay two patches screwing off in the shop but when someone was pulling out it only left one mark??   Then i would say it was a weak unit.

That question above about the two patches is legit and need it answered before I can gather another response to get to the bottom of this.

Sorry Mikey,, I go both ways    But I'll try ,, SURE POSI GRIP, SURE GRIP POSI, GRIP POSI,   SURE GRIP   

[WingCharger]

Repeat after me.  SURE GRIP.  posi is for the chevy crew. 

It could still be sure grip, just might be worn out and need rebuilt.

I'm guessing you are saying that you could lay two patches screwing off in the shop but when someone was pulling out it only left one mark??   Then i would say it was a weak unit.

That question above about the two patches is legit and need it answered before I can gather another response to get to the bottom of this.

Sorry Mikey,, I go both ways    But I'll try ,, SURE POSI GRIP, SURE GRIP POSI, GRIP POSI,   SURE GRIP   

Don't forget Twin Grip! Good old AMC.

[Moparbob]

Repeat after me.  SURE GRIP.  posi is for the chevy crew. 

It could still be sure grip, just might be worn out and need rebuilt.

I'm guessing you are saying that you could lay two patches screwing off in the shop but when someone was pulling out it only left one mark??   Then i would say it was a weak unit.

That question above about the two patches is legit and need it answered before I can gather another response to get to the bottom of this.

Sorry Mikey,, I go both ways    But I'll try ,, SURE POSI GRIP, SURE GRIP POSI, GRIP POSI,   SURE GRIP   

Don't forget Twin Grip! Good old AMC.

Apparently I have slip grip 

[Moparbob]

Id like to pull the cover tomorrow to identify what it is that I have and what I need to do. I bet I can find a chunk around here as I have ferreted out many Mopar nuts.

What am I looking for fellers?

[John_Kunkel]

It's not uncommon for the wheel to turn more freely forward than backward, this is because the output shaft of the trans turns more easily forward than backwards.

I'll wager it doesn't have Sure-Grip.

[Moparbob]

It's not uncommon for the wheel to turn more freely forward than backward, this is because the output shaft of the trans turns more easily forward than backwards.

I'll wager it doesn't have Sure-Grip.

It might before the end of the weekend If I take off the back cover, whats I B looking for??

[Moparbob]

It's not uncommon for the wheel to turn more freely forward than backward, this is because the output shaft of the trans turns more easily forward than backwards.

I'll wager it doesn't have Sure-Grip.

John what would be the reason they both spun in the gravel outside the shop if its not sure Grip? I mean if it weren't it would never spin both right? Imean it slings it around both sides.

[FLG]

On occasion you can get an open rear to spin both tires momentarily if the traction on each side is about the same. Since dirt varies in traction, both will sometimes spin.

[Moparbob]

On occasion you can get an open rear to spin both tires momentarily if the traction on each side is about the same. Since dirt varies in traction, both will sometimes spin.

So tomorrow when I pop the cover what exactly will I be wanting to see? Also,, how do I size this rear to find the guts I want? Ill need some numbers and stuff if anyone has any,, oh ,, pics would help too since I cant read 

[flyinlow]

I stopped wearing skirts and I noticed my rear did not hurt as much. 

You said you were going to pull the cover. Do you have a 8 1/4  axle behind your 440? If so just keep doing burn outs and soon you will have a suregrip.

[firefighter3931]

I stopped wearing skirts and I noticed my rear did not hurt as much. 

ROTF 

You said you were going to pull the cover. Do you have a 8 1/4  axle behind your 440? If so just keep doing burn outs and soon you will have a suregrip.

Good point. Bob, post a pic of your sore rear end so we can see what it looks like. 

The 8.25 will not last long behind a 440.  When you remove the cover make a note of the number of bolts that hold the cover in place....this will help us identify it. 



Ron

[Moparbob]

I stopped wearing skirts and I noticed my rear did not hurt as much. 

ROTF 

You said you were going to pull the cover. Do you have a 8 1/4  axle behind your 440? If so just keep doing burn outs and soon you will have a suregrip.

Good point. Bob, post a pic of your sore rear end so we can see what it looks like. 

The 8.25 will not last long behind a 440.  When you remove the cover make a note of the number of bolts that hold the cover in place....this will help us identify it. 



Ron

What rear am I hoping to see besides Pamela Anderson's?

[mikepmcs]

8-3/4 or dana 60

[Moparbob]

8-3/4 or dana 60

Mike, how many bolts in the 8 3/4 or daina 60? 

[mikepmcs]

this will be easier

[mikepmcs]

pictures in order are
open
clutch sg
cone sg

clutch is most desired for rebuilding but cone is still rebuildable.

no mistaking an 8-3/4 rear end as you can see by the last picture.

mike

[Moparbob]

And the winner is;

#4 9 1/4  Now to examine the innerds 

[firefighter3931]

And the winner is;

#4 9 1/4  Now to examine the innerds 

The 9.25 is a descent rear and is up to the task behind your 440. I would have no issues using it on a hot street/mild strip application. Hopefully you have a rebuildable suregrip in there. 


Ron