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Broke the ring gear what should I do?
#1073768
09/12/11 01:07 PM
09/12/11 01:07 PM
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Joined: Oct 2003
Posts: 614
ont,canada
mopartuner
OP
mopar
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OP
mopar
Joined: Oct 2003
Posts: 614
ont,canada
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I broke the ring gear in the 8-3/4 rear end(489 case)this was a 410 gear and had many street miles and some 10 second passes on it as well as the 12 second passes this last weekend.The car has a spool and is a small block(360,904 combo)and is 3000lbs.My question is should I just get a set of gears and go or should I change to a 742 case?The car has 35 sline axels in it as well.
410 pump gas solis flat tappet cam 10.95 so far
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073770
09/12/11 01:11 PM
09/12/11 01:11 PM
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Joined: Jan 2003
Posts: 684
St. Charles, MO.
Slingshot383
mopar
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mopar
Joined: Jan 2003
Posts: 684
St. Charles, MO.
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Clean it and install new gears. The 742 is not stronger than the 489.
1994 Undercover Chassis 125" altered
stack injected big block, soon blown and injected
Member of The Torque and Recoil Club
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Re: Broke the ring gear what should I do?
[Re: Slingshot383]
#1073773
09/12/11 01:19 PM
09/12/11 01:19 PM
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Joined: Jan 2003
Posts: 74,948
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,948
U.S.S.A.
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Quote:
Clean it and install new gears. The 742 is not stronger than the 489.
It's not ?
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073774
09/12/11 01:20 PM
09/12/11 01:20 PM
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Joined: Jan 2003
Posts: 74,948
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,948
U.S.S.A.
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Quote:
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I would think your case,spool & axles should be fine unless it was injured. You may have broke the sprag in your transmission,You may want to pull the trans & check. 
I called my tranny guy and he said if the overrunning clutch was gone that I would have no first gear and I did manage to back it up and put it up on the trailer in forword in low gear.
Is the guy going to stand behind that statement if and when your front drum comes thru the floor of your car ?
What gear were you in when this happened ?
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073777
09/12/11 01:30 PM
09/12/11 01:30 PM
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Joined: Jan 2003
Posts: 74,948
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,948
U.S.S.A.
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Quote:
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I would think your case,spool & axles should be fine unless it was injured. You may have broke the sprag in your transmission,You may want to pull the trans & check.
I called my tranny guy and he said if the overrunning clutch was gone that I would have no first gear and I did manage to back it up and put it up on the trailer in forword in low gear.
Is the guy going to stand behind that statement if and when your front drum comes thru the floor of your car ?
What gear were you in when this happened ?
1st gear......right on the starting line
Pull the trans ...
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073778
09/12/11 01:34 PM
09/12/11 01:34 PM
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Joined: Aug 2003
Posts: 43,099
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,099
Bend,OR USA
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Quote:
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I would think your case,spool & axles should be fine unless it was injured. You may have broke the sprag in your transmission,You may want to pull the trans & check.
I called my tranny guy and he said if the overrunning clutch was gone that I would have no first gear and I did manage to back it up and put it up on the trailer in forword in low gear.
Is the guy going to stand behind that statement if and when your front drum comes thru the floor of your car ?
What gear were you in when this happened ?
1st gear......right on the starting line
Take the tranny out and inspect the rear spraque  Sometimes you get lucky and sometimes you don't   Way better to be safe than not  I have a high dollar 727 SS trans that drives fine at low throttle but if I foot stall it it up and hit it, it acts like it is in nuetral, backs up good, goes into all the gaers, drives fine at low throttle. I broke the rear end it the car with that trans before that happened. I have several trans and need to take that one apart to fix it  Be safe
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Broke the ring gear what should I do?
[Re: DavidDean]
#1073780
09/12/11 02:37 PM
09/12/11 02:37 PM
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Joined: Oct 2003
Posts: 614
ont,canada
mopartuner
OP
mopar
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OP
mopar
Joined: Oct 2003
Posts: 614
ont,canada
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My transmission guy offered to check it for free so I think I will pull it.
410 pump gas solis flat tappet cam 10.95 so far
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Re: Broke the ring gear what should I do?
[Re: Blucuda413]
#1073782
09/12/11 02:56 PM
09/12/11 02:56 PM
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Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
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Pull the trans, inspect the over running clutch, no doubt about it. No way, no how I would chance it.
As for the 42 vs the 89, the 42 is stronger in that it has a larger rear pinion bearing which in turn reduces some pinion gear deflection. Other than that, no they are the same. Inspect the caps carefully as well as the carrier.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073785
09/12/11 03:30 PM
09/12/11 03:30 PM
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Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
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Are you still using the pinion crush sleeve  to set the pinion bearing preload or a spacer and shims? If crush sleeve, lose it and buy a spacer from Ratech Better yet,if you have access to a 742 case get it and use it
If I go to a 742 case then I need to buy another spool don't I?
No, but the ring and pinion is different as are the bearings for the pinion gear. You'll also need setup shims and the gear selection for the 742 case isn't as great as for the 489.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Broke the ring gear what should I do?
[Re: mopartuner]
#1073786
09/12/11 05:11 PM
09/12/11 05:11 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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The bad part about the 489 case is it uses a crush sleeve and the caps on the carrier are some what weak... if you change the cap/caps and go to a solid sleeve they work fine 
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If your going to stress any of the 8 3/4 center sections you should get one also