8 3/4 questions - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer 8 3/4 questions

Print Thread

Page 1 of 2

1

2

8 3/4 questions #1172445 02/05/12 12:28 PM 02/05/12 12:28 PM
Joined: Jan 2005 Posts: 134 Missouri C Clayton OP member
Clayton OP member C Joined: Jan 2005 Posts: 134 Missouri	Gonna be putting a 8 3/4 in my 67 barracuda and don't know much about them. I have a 489 case but Ive been told I can put any carrier in any case so my question is which is best for mostly street 500 hp big block, the one with clutches or the cone type. Ive heard conflicting advice about both so I would appreciate any help. Thanks, Clay

Re: 8 3/4 questions [Re: Clayton] #1172446 02/05/12 02:28 PM 02/05/12 02:28 PM
Joined: Feb 2010 Posts: 2,806 Northern NJ StukaJU87 master
StukaJU87 master Joined: Feb 2010 Posts: 2,806 Northern NJ	Use the clutch type. I have the cone type and it only hooks one wheel sometimes, sometimes both. It's a crapshoot. Scott 1969 Super Bee, 383/4 speed

Re: 8 3/4 questions [Re: StukaJU87] #1172447 02/05/12 03:00 PM 02/05/12 03:00 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: Use the clutch type. I have the cone type and it only hooks one wheel sometimes, sometimes both. It's a crapshoot. it's spent , eventually the spiders are going to gall and sieze to the shaft , the shaft will spin once it snaps the dowel that holds it then it will ruin the case . Benn there . OP , buy ANYTHING but any type of cone type .

Re: 8 3/4 questions [Re: JohnRR] #1172448 02/05/12 03:13 PM 02/05/12 03:13 PM
Joined: Jan 2005 Posts: 134 Missouri C Clayton OP member
Clayton OP member C Joined: Jan 2005 Posts: 134 Missouri	So I can just get any clutch type carrier from 741,742,489 case, add the gears I want and I'll be fine? Sorry if these seem like dumb questions but at this point I've been told so many things that I'm not sure what is right and I figured this would be the best place to ask;)

Re: 8 3/4 questions [Re: Clayton] #1172449 02/05/12 03:14 PM 02/05/12 03:14 PM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	The title read 8 3/4 questions. I only read one question. Feel free to add in the other 7 3/4 questions. We are always willing to help.

Re: 8 3/4 questions [Re: Kern Dog] #1172450 02/05/12 03:16 PM 02/05/12 03:16 PM
Joined: Nov 2007 Posts: 21,831 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,831 Kirkland, Washington	Quote: The title read 8 3/4 questions. I only read one question. Feel free to add in the other 7 3/4 questions. We are always willing to help. does a 3/4 race cam work well in a 440?

Re: 8 3/4 questions [Re: Pacnorthcuda] #1172451 02/05/12 03:17 PM 02/05/12 03:17 PM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	The 3/4 race cam is for HALF assed Chevy guys!

Re: 8 3/4 questions [Re: Pacnorthcuda] #1172452 02/05/12 03:28 PM 02/05/12 03:28 PM
Joined: Jan 2005 Posts: 134 Missouri C Clayton OP member
Clayton OP member C Joined: Jan 2005 Posts: 134 Missouri	I might have to stop at 8 5/8 questions before I learn just enough to be dangerous...:)

Re: 8 3/4 questions [Re: Clayton] #1172453 02/05/12 03:29 PM 02/05/12 03:29 PM
Joined: Nov 2007 Posts: 21,831 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,831 Kirkland, Washington	What size socket is required to adjust torsion bar ride height?

Re: 8 3/4 questions [Re: JohnRR] #1172454 02/05/12 03:59 PM 02/05/12 03:59 PM
Joined: Feb 2010 Posts: 2,806 Northern NJ StukaJU87 master
StukaJU87 master Joined: Feb 2010 Posts: 2,806 Northern NJ	Quote: Quote: Use the clutch type. I have the cone type and it only hooks one wheel sometimes, sometimes both. It's a crapshoot. it's spent , eventually the spiders are going to gall and sieze to the shaft , the shaft will spin once it snaps the dowel that holds it then it will ruin the case . Great. I was under the impression that it will just act like an open rear when it's shot completely. Now I have to worry about when it will be grenading? Scott 1969 Super Bee, 383/4 speed

Re: 8 3/4 questions [Re: StukaJU87] #1172455 02/05/12 04:41 PM 02/05/12 04:41 PM
Joined: Jan 2003 Posts: 5,186 Wherever I am. J Junky master
Junky master J Joined: Jan 2003 Posts: 5,186 Wherever I am.	I must be one of the lucky ones. Purchased a 3.73 cone type pig from Randy's 10 years ago. Still works perfect. 2010 Black Challenger SE <> 3.5 V6 Custom Shift Knobs www.flameball.com Check It Out

Re: 8 3/4 questions [Re: Junky] #1172456 02/05/12 05:26 PM 02/05/12 05:26 PM
Joined: Jan 2005 Posts: 134 Missouri C Clayton OP member
Clayton OP member C Joined: Jan 2005 Posts: 134 Missouri	Yea popular opinion seems to be the clutch type especially since its rebuildable. Now have to pull the center and see whats in it, since its been back braced and has aftermarket axels I have the sneeking suspicion thats its spooled......

Re: 8 3/4 questions [Re: Junky] #1172457 02/05/12 05:31 PM 02/05/12 05:31 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: I must be one of the lucky ones. Purchased a 3.73 cone type pig from Randy's 10 years ago. Still works perfect. There is always one in every crowd .....

Re: 8 3/4 questions [Re: StukaJU87] #1172458 02/05/12 05:31 PM 02/05/12 05:31 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: Quote: Quote: Use the clutch type. I have the cone type and it only hooks one wheel sometimes, sometimes both. It's a crapshoot. it's spent , eventually the spiders are going to gall and sieze to the shaft , the shaft will spin once it snaps the dowel that holds it then it will ruin the case . Great. I was under the impression that it will just act like an open rear when it's shot completely. Now I have to worry about when it will be grenading? That would be a big YES ...

Re: 8 3/4 questions [Re: JohnRR] #1172459 02/05/12 05:46 PM 02/05/12 05:46 PM
Joined: Jan 2008 Posts: 1,213 Minn S SportF pro stock
SportF pro stock S Joined: Jan 2008 Posts: 1,213 Minn	I wasn't going to reply to this as this topic comes up all the time. Why will the spyder gears gall. There isn't much load on them when the unit is wore and there is no load going straight ahead. On the cone vs clutch, those clutch types (used) are pretty rare. The cone types can be rebuilt as well. If only one wheel grabs the unit is wore. I rebuilt a wore out cone unit 15 years ago, and crudely at that. In a '62 Plymouth running low 12's with well over 400 passes and 10k in hard street miles it still works. This is with tapered axles and a ball and trunnion joint at the tranny, and that isn't suppose to work either. I took a cone type gear set out of a junkyard truck with 200,000+ miles on it and the cone stuff was still good. Give me the cone stuff every time. This isn't stuff I think, its stuff I know. Good luck.

Re: 8 3/4 questions [Re: SportF] #1172460 02/05/12 05:55 PM 02/05/12 05:55 PM
Joined: Jan 2003 Posts: 25,852 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,852 Rio Linda, CA	The cone-type spider gears are more likely to gall because there's only two of them, the clutch-type has four. Since it's unlikely that any two tires are the exact same diameter, the differential gears will be under load even when going straight ahead. The INTERNET, the MISinformation superhighway

Re: 8 3/4 questions [Re: SportF] #1172461 02/05/12 06:02 PM 02/05/12 06:02 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	You run into problems when the cones wear and the unit turns into an open differential. If you do many 1 wheel burn-outs with a worn cone sure-grip, the spider gears friction weld themselves to the differental cross shaft. This causes the cross shaft to spin, which eventually wallows out the pin bore in the carrier. Contact info

Re: 8 3/4 questions [Re: John_Kunkel] #1172462 02/05/12 06:17 PM 02/05/12 06:17 PM
Joined: Jan 2008 Posts: 1,213 Minn S SportF pro stock
SportF pro stock S Joined: Jan 2008 Posts: 1,213 Minn	Doesn't that also means open rears must be subject to the same galling effect, if not more, and you really don't hear much of that, unless you run low on oil.

Re: 8 3/4 questions [Re: SportF] #1172463 02/05/12 06:43 PM 02/05/12 06:43 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Open differentials suffer the same fate. I see it all the time. If you perform extended burn outs with an open differential, you will friction weld the spider gears. Because spider gears do not contain bearings, they are designed to spin SLOWLY only when the vehicle goes around corners, NOT thousands of RPMs during a 1 wheel burn-out. Of course, this can also happen with an over-zealous driver stuck in mud/snow/ice. Contact info

Re: 8 3/4 questions [Re: DoctorDiff] #1172464 02/05/12 06:50 PM 02/05/12 06:50 PM
Joined: Feb 2010 Posts: 2,806 Northern NJ StukaJU87 master
StukaJU87 master Joined: Feb 2010 Posts: 2,806 Northern NJ	So, I guess I will soon be needing a new Eaton TrueTrac somewhere down the line. Seriously though....if I drive the worn out cone type without doing extensive burnouts, will it live or self destruct? Scott 1969 Super Bee, 383/4 speed

Page 1 of 2

1

2

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1