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Removal of Thrust Buttons in 8.75 SG ?? UPDATE
#287203
04/13/09 12:41 PM
04/13/09 12:41 PM
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Joined: Jul 2004
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Retired now in Tennessee
Chi_Town_Runner
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I have an 8.75 SG 742 case that still has the Thrust buttons installed. From a very knowledgeable source I have been advised to remove these buttons since I have the green bearings installed on my axles. The diff is mounted to my engine stand so I do have easy access to it. When viewing the buttons through the axle openings how can I tell which way to drive out the pin holding the buttons in place? As I look at it, one side of the pin seems to be machined flat and on the other side, the pin appears to have a dimple in the center. Am I correct to assume the dimpled side is the side that the pin was installed from, therefore, hammer out the pin from the smooth machined side. If so, how much force to hammer it out. I'm a first timer at this thrust button deal. Any help would be greatly appreciated. Thanks, Frank 
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: MoparforLife]
#287206
04/13/09 01:23 PM
04/13/09 01:23 PM
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JohnRR
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Quote:
The roll pin will come out either way but first if you can just take a magnet and try to fish the buttons out. The pin is more than likely broken any way. All is is is a pin that holds the buttons in place for assembly. I haven't used a pin in them for years.
Alot of the time the buttons will fall out when you pull the axles.
Stand the axle on end if the pumpkin is in the houing and they may fall out too.
If the pumpkin is not in the housing they are a piece of cake to get out. Grab with a long needle nose pliers.
 ... normally they will fall out when you are pulling the axles out when it's in the housing and you don't even realize it . I found a pair of the buttios in my bee rear , one in each axle tube grinding a notch in the axles  ...
If it's a FRESHLY built rear it will have a new rollpin as the originals usually break after a number of miles , the rollpin is just to hold it together until the rear is completely assembled ...
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: MoparforLife]
#287207
04/13/09 01:28 PM
04/13/09 01:28 PM
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Joined: Jul 2004
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Retired now in Tennessee
Chi_Town_Runner
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Thanks for the replys. It seems that the two thrust buttons are attached to each other via the pin. I have tried the magnet and the long needle nose plyers. They do float in the housing, meaning if I push on one the other side moves also. They are not frozen. Again, I'm new to this so I went to Mancini to see what these things look like. See the link: Mancini . I'm not saying that these are the buttons in there, as I don't think this thing has been apart since '68, but looking at the Mancini part, the pin can only come out one way. But maybe your right for a '68 vintage gear. In either case, those buttons are not floating independant of each other. They are fixed via the pin. Thanks Frank
Last edited by Chi_Town_Runner; 04/13/09 01:29 PM.
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: sthemi]
#287209
04/13/09 01:53 PM
04/13/09 01:53 PM
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Chi_Town_Runner
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Greg,
How can I tell if I have a cup and cone type SG?
Mine has 8 bolts holding the two halves together.
So far, every one has mentioned a "roll pin".
My understanding of roll pin is a round pin, hollow in the middle and split down the side to allow for compression. This pin is SOLID.
Not trying to sound too dumb or anal but maybe I'm missing something here. I defer to many members on this baod with far more knowledge than I.
Thanks to everyone.
Frank
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: JohnRR]
#287210
04/13/09 01:57 PM
04/13/09 01:57 PM
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Chi_Town_Runner
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John,
I tried the needle nose plyers. The buttons are definitely secure to the pin. If I turn one side the other side also turns.
Frank
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: DoctorDiff]
#287212
04/13/09 02:07 PM
04/13/09 02:07 PM
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JohnRR
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Quote:
If you have stock axles, a stock housing and snap-ring style green bearings you do not have to remove the thrust buttons.
Thanks for that Doc , is this also the case with the thrust block on a cone type and if so is this something that only pertains to the snap ring greens ?
Frank , if you have buttons like the one in the link above it's not a cone type , also you can not rotate the thrust block in a cone type it's fixed ,it can only move a little and you wouldn't be able to grab the block with pliers as is almost the same size as the hole the axle splines into .
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: JohnRR]
#287213
04/13/09 02:19 PM
04/13/09 02:19 PM
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Joined: Jul 2004
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Retired now in Tennessee
Chi_Town_Runner
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John, I don't know what type of buttons I have in there. I did some research to see how these buttons were held in place and I came across the Mancini site. From all outward apperances the buttons do look the same as the photo. I can rotate the buttons, slide them back and forth, just not independantly of each other. They are fixed to that pin. I don't think it's a rivit. As I said earlier the pins face on one side looks almost machined, spiral groves, and the other looks like it's been dimpled in the middle, not by force but by machining. Hope I'm not adding to the confusion with all of this discription. Dr. Diff, It is the stock housing, stock axles, I just don't know what type of green bearing I had installed 6 year ago. How would I be able to tell if they are the snap ring type. I don't want to remove the thrust buttons if it's not necessary. I really appreciate the patience exhibited here on "MY" problem. Frank
Last edited by Chi_Town_Runner; 04/13/09 02:23 PM.
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: 69Cuda340S]
#287217
04/13/09 02:43 PM
04/13/09 02:43 PM
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Joined: Jul 2004
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Retired now in Tennessee
Chi_Town_Runner
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Bill,
I'm sure I have the clutch type based on the info I received here so far. Could you look at the thrust space kit you have and describe what the ends of the pins look like. If I can tell from the discription of what the face of each end looks like then I should be able to determine which way to hammer the pin out.
From the photo on the link it can only come out one way because of the one expanded head.
Thanks
Frank
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ?? UPDATE
[Re: Chi_Town_Runner]
#287218
04/13/09 04:31 PM
04/13/09 04:31 PM
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Posts: 1,101
Retired now in Tennessee
Chi_Town_Runner
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Yahooo  Got it  After all the help on this board I took a fine punch and with some FIRM taps was able to knock out the pin holding the buttons . My buttons resembled the ones from Mancini in the link above. It appears that it does not matter in which direction you punch out the pin. I must have been at the chamfered side. The chamfer on the pin is not very solid and seperated from the pin to release it. Just make sure you recover any pieces after the removal. Thanks to: Johnahah Moparforlife sthemi DoctorDiff 69Cuda340S and 1_Wild_RT I appreciate your help and time.  Thanks Frank
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: 71383beep]
#287222
04/13/09 10:40 PM
04/13/09 10:40 PM
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Joined: Jul 2004
Posts: 1,101
Retired now in Tennessee
Chi_Town_Runner
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Hey 71383bee, It was your initial post that caused me to look at my thrust buttons. I had not yet stabbed in the pumkin yet but I figured I would shortstop any poss prob. Glad you got your issue resolved. DrDiff is da man. Frank
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: Chi_Town_Runner]
#287223
04/14/09 02:02 PM
04/14/09 02:02 PM
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Joined: Jan 2005
Posts: 1,647
IL
71383beep
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How about that. I didn't think the button was a problem becasue I was already using the SG in a 741 case w/ 3.91 gears and stock axles w/ green bearings originally. Over the winter i discovered that my vibration problem was mostly due to the poor build on the 3rd member so I rebuilt a spare 489 chunk with the SG and 3.73 gears. It turns out is that my installation problem was due to me not having the side gears lined up right when rebuilding the SG. I tell ya though turning that half in axle to get it lined up was no picinic. I was just about to give up and pull the whole thing apart when I gave her one good last try. At most i could turn the axle about 1/16 of a turn and I ended up turnit a full 1/3 to finally get it lined up. At least now you know if you have the same issue. If one axle doesn't go all of the way in don't panic just get the other side all put together, put the wheel on, set her down and block the wheel and get ready to sweat! 
'73 GK6 Challenger Rallye - 340 4-Speed
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: 71383beep]
#287224
04/14/09 02:59 PM
04/14/09 02:59 PM
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JohnRR
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Quote:
How about that.
I didn't think the button was a problem becasue I was already using the SG in a 741 case w/ 3.91 gears and stock axles w/ green bearings originally.
Over the winter i discovered that my vibration problem was mostly due to the poor build on the 3rd member so I rebuilt a spare 489 chunk with the SG and 3.73 gears.
It turns out is that my installation problem was due to me not having the side gears lined up right when rebuilding the SG.
I tell ya though turning that half in axle to get it lined up was no picinic. I was just about to give up and pull the whole thing apart when I gave her one good last try. At most i could turn the axle about 1/16 of a turn and I ended up turnit a full 1/3 to finally get it lined up.
At least now you know if you have the same issue. If one axle doesn't go all of the way in don't panic just get the other side all put together, put the wheel on, set her down and block the wheel and get ready to sweat!
i took 2 old axles and cut the ends of them off to make a holer and alignment shaft for reaseemebly , it's still takes a little to get them straight as I have had the stub get stuck in the unit from misalignment . I have a couple to do for myself for 2 different chucks of my own and I think I'm going to buy 1 piece side gears .
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: DoctorDiff]
#287227
04/14/09 04:44 PM
04/14/09 04:44 PM
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Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S
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Quote:
The side gear and hub splines must be aligned on all factory equipped 8 3/4" sure-grips, except for the late '68 model power-locks.
Thanks Cass. Maybe mine is a late '68 Power Lok because when I look in the sides everything looks like its lined up. But I'll make sure the axles go in easily before I install it just to be sure.
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: 69Cuda340S]
#287231
04/15/09 11:39 AM
04/15/09 11:39 AM
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JohnRR
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Quote:
Mine has a one piece side gear. Guy I bought it from has been sitting on it for over 20 years. Says it came out of a late '60s C-body. Sounds like I don't need to worry about spline alignment.
Interesting , I have not found a 1 piece side gear in an original spicer power lock
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Re: Removal of Thrust Buttons in 8.75 SG ??
[Re: JohnRR]
#287234
04/15/09 06:02 PM
04/15/09 06:02 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
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Quote:
Quote:
Mine has a one piece side gear. Guy I bought it from has been sitting on it for over 20 years. Says it came out of a late '60s C-body. Sounds like I don't need to worry about spline alignment.
Interesting , I have not found a 1 piece side gear in an original spicer power lock
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