Transmissions and Drivetrain Need help with your trans? Problems with your axle?

cones bottoming out in 9 bolt

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Old Sep 26, 2009 | 10:13 AM
  #1  
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
cones bottoming out in 9 bolt

what should I do

buy new cones

machine old cones and shim

get a new carrier- too expensive
Attached Thumbnails cones bottoming out in 9 bolt-dscf0941.jpg   cones bottoming out in 9 bolt-dscf0943.jpg  
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Old Sep 26, 2009 | 11:53 AM
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Re: cones bottoming out in 9 bolt

The method that I have heard is to machine the end of the cone and put shims under the axle gears. I haven't done one myself, but I'm sure that the day will come when I do.
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Old Sep 27, 2009 | 08:57 AM
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: cones bottoming out in 9 bolt

would it hurt anything if I left the carrier alone and delt with the one wheel peel
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Old Sep 27, 2009 | 10:59 AM
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From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: cones bottoming out in 9 bolt

It won't hurt to just leave it. I've had luck filing a few thousands (.005 or so) off the ends and shimming them. It usually brings them back to life for a while. But if the inside of the cone is hitting (as opposed to the outside edge), they will need to be milled.
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Old Sep 27, 2009 | 01:14 PM
  #5  
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: cones bottoming out in 9 bolt

so if I go with the milling and shimming how much should be taken off and how big of a shim should I use
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Old Sep 27, 2009 | 03:15 PM
  #6  
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Re: cones bottoming out in 9 bolt

As the cones wear the axle gears move farther apart. This makes the gears contact farther out toward the face of the tooth instead of in the center where they are suppose to contact. This makes the gears weaker. The gears need to be shimmed so that they make contact in the correct place so that they will not break. The Borg Warner unit is stronger because it has 4 pinion gears instead of 2, like most rear ends.
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Old Sep 28, 2009 | 12:09 PM
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From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: cones bottoming out in 9 bolt

This link will help: https://www.thirdgen.org/forums/faq-...now-about.html
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Old Sep 29, 2009 | 08:00 PM
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Re: cones bottoming out in 9 bolt

Originally Posted by jamon8
would it hurt anything if I left the carrier alone and delt with the one wheel peel
As biggearhead said it will hurt it if you leave it that way. There will be too much clearance on the spider gears and if you beat on it a for a bit it will break. The best bet is to machine the ends down and shim it tight again. I had to do that with a "supposedly" tight rear end. Its not that hard and i have a very tight posi again. Also, when you go to put new oil in, do not use a limited slip additive. Cone type LSDs do not need it and it will actually prematurely wear it out since the cones will be allowed to slip too much.
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Old Oct 1, 2009 | 02:52 PM
  #9  
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: cones bottoming out in 9 bolt

ttt
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Old Oct 1, 2009 | 03:28 PM
  #10  
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Re: cones bottoming out in 9 bolt

Originally Posted by jamon8
so if I go with the milling and shimming how much should be taken off and how big of a shim should I use


Here is the pdf with everything you should need to know about setting up your 9 bolt. Also read the link above that has already been posted (the everything i know about 9 bolts link). After these two items you should be good to go.

http://www.geocities.com/luckyducky....air30Nov04.pdf
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Old Oct 1, 2009 | 04:40 PM
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From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: cones bottoming out in 9 bolt

Originally Posted by subroc
Here is the pdf with everything you should need to know about setting up your 9 bolt. Also read the link above that has already been posted (the everything i know about 9 bolts link). After these two items you should be good to go.

http://www.geocities.com/luckyducky....air30Nov04.pdf
That link doesnt work?
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Old Oct 1, 2009 | 04:50 PM
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From: Guilford, Connecticut
Car: 1988 IROC-Z camaro
Engine: 355 TPI
Transmission: tko 500
Axle/Gears: Dana 44 3.31 posi pbr brakes
Re: cones bottoming out in 9 bolt

Originally Posted by InfernalVortex
That link doesnt work?
Sorry. Heres the link i was trying to post. Ill edit the one above too. Its the HTML version of it. Click the link and then click the top link once your in. That way you can see the pictures as well. Otherwise its just text.

http://74.125.113.132/search?q=cache...ient=firefox-a
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