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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
Joined: Jan 2005 Posts: 1,647 IL 7 71383beep top fuel
71383beep top fuel 7 Joined: Jan 2005 Posts: 1,647 IL	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

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: 71383beep] #287224 04/14/09 02:59 PM 04/14/09 02:59 PM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	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 .

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: JohnRR] #287225 04/14/09 04:19 PM 04/14/09 04:19 PM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	Is this sure grip alignment issue with the Power Lok clutch sure grips? I saw a note in the '68 FSM about Power Lok side gear alignment but it seems like the side gear is held in place and doesn't need to be aligned?? I know with the cone sure grips the side gear and cone splines must be aligned but I don't see any alignment issues with the Power Lok sure grips.

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: 69Cuda340S] #287226 04/14/09 04:37 PM 04/14/09 04:37 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	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. Contact info

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: DoctorDiff] #287227 04/14/09 04:44 PM 04/14/09 04:44 PM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	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.

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: 69Cuda340S] #287228 04/14/09 04:48 PM 04/14/09 04:48 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Repro power-locks also use the redesigned (1 piece) side gears. Contact info

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: DoctorDiff] #287229 04/14/09 05:16 PM 04/14/09 05:16 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Just Because..Two piece gear... 5164323-trac-loc005.jpg (224 downloads)

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: 1_WILD_RT] #287230 04/15/09 10:33 AM 04/15/09 10:33 AM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	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.

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: 69Cuda340S] #287231 04/15/09 11:39 AM 04/15/09 11:39 AM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	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

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: JohnRR] #287232 04/15/09 03:40 PM 04/15/09 03:40 PM
Joined: Dec 2004 Posts: 2,367 Wheatfield, NY Cuda340 top fuel
Cuda340 top fuel Joined: Dec 2004 Posts: 2,367 Wheatfield, NY	Like Cass said in 1968 they finally smartened up and made the two piece side gears one piece. I know b/c I had one that the spiders and side gears were chewed up. When I bought the rebuild kit they were the one piece ones as well. But if you have the two piece and the splines are not aligned, take the axle shafts loosen the bolts on the carrier and turn until they (both axles) drop in fully and retorque the carrier bolts.

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: Cuda340] #287233 04/15/09 05:30 PM 04/15/09 05:30 PM
Joined: Jan 2005 Posts: 1,647 IL 7 71383beep top fuel
71383beep top fuel 7 Joined: Jan 2005 Posts: 1,647 IL	Quote: Like Cass said in 1968 they finally smartened up and made the two piece side gears one piece. I know b/c I had one that the spiders and side gears were chewed up. When I bought the rebuild kit they were the one piece ones as well. But if you have the two piece and the splines are not aligned, take the axle shafts loosen the bolts on the carrier and turn until they (both axles) drop in fully and retorque the carrier bolts. To clarify you are refering to assembling the SG assembly right? Not the whole assembled 3rd member...Once its on the car I can't imagine doing anything other than what I did to get them to line up. I remember the 68 FSM had a detailed description of insertng the axles when assembling the SG case halves and tightening. Now it all makes sense... '73 GK6 Challenger Rallye - 340 4-Speed

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: JohnRR] #287234 04/15/09 06:02 PM 04/15/09 06:02 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	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

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: MoparforLife] #287235 04/15/09 07:11 PM 04/15/09 07:11 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Original units with 1 piece side gears are rare. They were only used for the second half of the 1968 model year. I just sold a nice original 2.76/7290/742 case equipped with 1 piece side gears at MATS. Contact info

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: DoctorDiff] #287236 04/15/09 07:20 PM 04/15/09 07:20 PM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	learned something new , but I have to say that all the power locks i have are of 66 vintage so that;s why I haven't stumbled on one yet .

Re: Removal of Thrust Buttons in 8.75 SG ?? [Re: JohnRR] #287237 04/16/09 01:58 PM 04/16/09 01:58 PM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	So the one I have must be a late '68 because it is definitely an old original one and it definitely has one piece side gears. So no alignment needed for mine like I had originally thought.

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