Upgrade my 12 bolt or go 9" - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 7 (permalink) Old Feb 3rd, 13, 11:37 AM Thread Starter
Tech Team
 
Join Date: Apr 2004
Location: Detroit
Posts: 59
Upgrade my 12 bolt or go 9"

Hi Guys

I've got a 68 prostreet BBC that I'm slowly working on turning into a restomod/protouring car. I will eventually go turbo LS 6 speed. My target is 600 RWHP.

That being said I need to get my rear end to be a bit more streetable. Right now I have:

12 bolt 4 link
C-clip eliminators
spool
4.56
TA girdle cover
fully welded tubes

Easiest upgrade for me would be to continue to build the 12 bolt with the following

9" axle ends
35 spline axles
wavetrac
Drop down to 3.42-3.73's for the M6


Obviously the other way to go is 9". I would have to get the 4 link stuff welded up and get the driveshaft modified. I'd probably want to go with the wavetrac in that as well.

I don't plan to drag much. If I do it will be on street tires. Thoughts?

'68 Pro-street
cbrock is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old Feb 3rd, 13, 11:41 AM
Senior Tech Team
 
Join Date: May 1999
Location: Atlanta
Posts: 5,059
Re: Upgrade my 12 bolt or go 9"

Quote:
Originally Posted by cbrock View Post
Hi Guys

I've got a 68 prostreet BBC that I'm slowly working on turning into a restomod/protouring car. I will eventually go turbo LS 6 speed. My target is 600 RWHP.

That being said I need to get my rear end to be a bit more streetable. Right now I have:

12 bolt 4 link
C-clip eliminators
spool
4.56
TA girdle cover
fully welded tubes

Easiest upgrade for me would be to continue to build the 12 bolt with the following

9" axle ends
35 spline axles
wavetrac
Drop down to 3.42-3.73's for the M6


Obviously the other way to go is 9". I would have to get the 4 link stuff welded up and get the driveshaft modified. I'd probably want to go with the wavetrac in that as well.

I don't plan to drag much. If I do it will be on street tires. Thoughts?

Whatever you do get rid of the spool. Dangerous on the street.
oman is offline  
post #3 of 7 (permalink) Old Feb 3rd, 13, 12:09 PM
Senior Tech Team
Greg.
 
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 4,756
Garage
Re: Upgrade my 12 bolt or go 9"

Dana S60 by Strange with 3.55 Rear Ratio with Trac-Loc Posi and 1350 yoke pinions .

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Kirk's67SS is online now  
 
post #4 of 7 (permalink) Old Feb 3rd, 13, 12:32 PM
Senior Tech Team
Gary
 
Join Date: Feb 2007
Location: Kansas City,Mo.
Posts: 4,348
Re: Upgrade my 12 bolt or go 9"

i would upgrade your 12 bolt.put the new ends on ,make sure the tubes are straight and aligned and go.you need a fixture for the fab work . lots cheaper than buying a brand nerw housing and less work than modifying a 9 inch to fit the car. i run a factory 12 bolt in my low 9 sec drag car
gnicholson is offline  
post #5 of 7 (permalink) Old Feb 3rd, 13, 1:44 PM
Senior Tech Team
Freddie
 
Join Date: Feb 2000
Location: Central City, Ky.
Posts: 9,274
Re: Upgrade my 12 bolt or go 9"

Do the 12 bolt. You have a good plan for it.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
big gear head is offline  
post #6 of 7 (permalink) Old Feb 6th, 13, 1:34 PM Thread Starter
Tech Team
 
Join Date: Apr 2004
Location: Detroit
Posts: 59
Re: Upgrade my 12 bolt or go 9"

12 bolt it is. I found a nice picture on another forum where they added some back bracing to the 12 bolt axle tubes and ran a removable bar to go across the rear cover area. It looked like it could be adjust to add a little preload to the tubes.


For those of you who haven't driven a spool on the street it's really not that bad. Clearly, cars like this aren't out running in the rain or snow. The only real &@#$& is trying to parallel park. I want the car to drive like OEM but handle some serious power, something like the wavetrac seems to fit the bill.

'68 Pro-street
cbrock is offline  
post #7 of 7 (permalink) Old Feb 6th, 13, 1:48 PM
Senior Tech Team
 
Join Date: Dec 2005
Location: Lancaster, PA
Posts: 10,929
Re: Upgrade my 12 bolt or go 9"

Good Choice. They work fine.


Ray


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Best pass 8.87 at 150.98 1.212 60'. Sold 3/2018

1970 SS 396 project in progress. Bought 5/2018
bracketchev1221 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Old Thread Warning
This Thread is more than 2441 days old. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
If you still feel it is necessary to make a new reply, you can still do so though.

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome