8 3/4 rearend need help

Old 08-14-2010, 11:48 AM
  #1  
rat69
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2005
Posts: 8
Default 8 3/4 rearend need help

i run an 8 3/4 rearend under a 80 backhalved malibu,it has a 406 with a glide in it.ive broke 2 ring gears in it ive put a 3rd set of 513s in it but now ive back braced the rear do you think this will make the gears last????
rat69 is offline  
Old 08-15-2010, 07:47 AM
  #2  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default

The only 8 3/4 out there is Mopar. You SURE it's an 8.75 ? They have a drop out punkin like the 9" Ford, and are usually pretty bullet proof.
TheYellaBrick is offline  
Old 08-15-2010, 12:01 PM
  #3  
rat69
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2005
Posts: 8
Default

im sure it has a 742 case with the big pinion,dumps out the front,like i said this is the second ring gear ive put in it but this time i put a rearend backbrace on it.do you think that will help the gear last?
rat69 is offline  
Old 08-15-2010, 04:11 PM
  #4  
ccperf721p
Senior Member
SENIOR BUILDER
 
Join Date: Nov 2008
Location: Phoenix AZ
Posts: 116
Default

The backbrace will help to some extent, but eventually you will need to move to the steel main caps and billet adjusters to get to a point of decent life from the gears. At the point it's better to just move on to something else.
ccperf721p is offline  
Old 08-15-2010, 05:10 PM
  #5  
rat69
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2005
Posts: 8
Default

if i can make through this season, im ganna build a dana 60,do you think they will last the rest of the season???
rat69 is offline  
Old 09-29-2010, 07:22 PM
  #6  
spib
Senior Member
RACING JUNKIE
 
Join Date: Jan 2006
Location: EastWenatchee,WA
Posts: 887
Default

I have the same problem, was thinking of going to 35 spline spool and axels, checked with rear end shops, strange, moser and others they all said same thing, will break ring and pinions, this yr with new motor, and glide with brake, only left on 3500 chip on 2 step, next yr going to a dana 60 with 40 spline, want something that will live and then can bring chip on 2 step up more, will not put money in my mopar 8 3/4 will put in another s10 for wife
spib is offline  
Old 10-17-2010, 07:20 PM
  #7  
rat69
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2005
Posts: 8
Default

i hear ya i feel the same way,since last posting i put another 513 gear in my car i got 100 passes it broke friday nite....now i have another question.....im ganna build a dana 60 but i have 35 spline axles in my 8 3/4 can i use them if i buy a 35 spline spool for the dana??????
rat69 is offline  
Old 10-27-2010, 03:31 PM
  #8  
mopar1968
Senior Member
RACING JUNKIE
 
mopar1968's Avatar
 
Join Date: Dec 2006
Location: Abingdon,Virginia
Posts: 3,578
Default

Mine is a 8 3/4, back brace it and go with billet caps this will stop your problem :!: The tubes are flexing too much i had the same problem :!: JMO Mark
mopar1968 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -