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    Results 1 to 16 of 16
    1. #1
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213

      10 Bolt Question

      I have a 69 Camaro with a 10 Bolt Differential with what ever stock gearing it came with. I’m running a 700R4 and I’m happy with it’s performance as I only use the overdrive when I hit freeway speeds but I will upgrade my gearing to a 3:55 or close to that. My question is do I have 28 spline axles or 30? I’ve read that the 30 slines were used only on the 12 bolt.

    2. #2
      Join Date
      Jan 2019
      Location
      Athens, AL
      Posts
      38
      Country Flag: United States
      You've got the 28 spline unit, I'm 90% sure. The late 80's/early 90's truck ten bolts (and a few select passenger cars) went to 30 spline.

      Travis

      PS - if it is indeed the stock ratio, the rear end code may be stamped into the axle housing tube. Not sure which side, it's on the passenger side on the 67-72 GM trucks.

    3. #3
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213
      That’s what I thought, thanks

    4. #4
      Join Date
      Jun 2006
      Location
      Katy,TX
      Posts
      1,678
      Probably an 8.2" also that are weaker than the 8.5s used in most second gens.
      1978 Black Trans Am 455 Edelbrock heads [email protected] through mufflers on pump gas
      1981 Trans Am 400 stock type motor
      79 Camaro getting a 500" 695 hp IA2 Pontiac motor
      1965 GTO project car
      470ci/Chevy dual quad 409 604 HP 64 Impala SS project
      2004 Pulse Red GTO

    5. #5
      Join Date
      Aug 2005
      Location
      Hamilton, NJ
      Posts
      4,291
      Country Flag: United States
      Quote Originally Posted by Skip Fix View Post
      Probably an 8.2" also that are weaker than the 8.5s used in most second gens.
      Yes. I would agree. But check it, could be a nova 8.5, common swap.
      Scott from NJ.

      Vent Windows Forever! ...

      Feather-light suspension, Konis just couldn't hold
      I'm so glad I took a look inside your showroom doors

    6. #6
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213
      Name:  049DBE92-F227-4B76-9B01-36CC2049297B.jpeg
Views: 526
Size:  71.8 KB

      Mine is the middle one with the lower squares

    7. #7
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213
      So what kind of medications can be made to a 28 spline, 8.5, 10 bolt rear end?

    8. #8
      Join Date
      Aug 2005
      Location
      Hamilton, NJ
      Posts
      4,291
      Country Flag: United States
      Have the axle tubes welded. I'm an assuming you can get 30 spline axles for that housing off the shelf. Then you can get a new differential and step up to the stronger axles. That is what I used in my 2nd gen 8.5
      Scott from NJ.

      Vent Windows Forever! ...

      Feather-light suspension, Konis just couldn't hold
      I'm so glad I took a look inside your showroom doors

    9. #9
      Join Date
      Jan 2019
      Location
      Athens, AL
      Posts
      38
      Country Flag: United States
      You can also upgrade the housing ends to accept axles that utilize the big ford 3.150" pressed on bearing. This buys you a larger bearing, along with a bigger axle diameter where the axle passes through the bearing. This matters especially to those who want to autocross or run on the road course; side loading puts more load on the bearing and the axle. This arrangement also eliminates the C-clips for better axle retention. The housing ends use the same bolt pattern as the stock GM stuff, so aftermarket brake setups for the factory 8.5" housing ends will still work. I know that Strange carries these components, and I'm sure Moser will as well. Cost for the Strange 30 spline axles, the bearing kit, and the housing ends is about $575. A board vendor may be able to get them cheaper.

      Travis

    10. #10
      Join Date
      Aug 2010
      Location
      Seattle area
      Posts
      360
      Just go with a 8.5 10 bolt out of a 1973-4 Nova .Its stronger and there are more parts for it. I have my stock 8.5 rear end in my 1979 Z-28 Pro-Touring car .It has a supercharged small block .Super T-10 4 speed and 3;42 gears .It has a Moroso "Brute Strength' posi and 30 spline Mosier axles.Chevrolet 3;42 gears, Never had any issues

    11. #11
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213
      I’m not planning on Autocrossing, just a daily driver. I would like to go with 3.42 gearing and maybe a stronger diferential since this one is old.

    12. #12
      Join Date
      Mar 2018
      Posts
      68
      Don’t underestimate the strength of the 8.5. If you’re not running slicks and doing 6k clutch drops at every light you should be fine. How much power are you making? Also, if youre considering a gear change a small increase or decrease in tire size has an effect on final drive ratio as well.

      I have a 8.5 inch 10 bolt 28 spline in a 70 Nova. Eaton clutch style posi. Just had the posi rebuilt, new axles, bearings and 3.90s put in (previously 3.42s). It’s behind a 441 rwhp LS3/tko 600 street car FWIW. I plan on driving the piss out of it

    13. #13
      Join Date
      Oct 2004
      Posts
      2,544
      Country Flag: United States
      Quote Originally Posted by elwaupo View Post
      So what kind of medications can be made to a 28 spline, 8.5, 10 bolt rear end?
      Some viagra might stiffen it up.

      But seriously, for the use you described, probably just weld up the axle tubes and replace the diffy with a Truetrac. Since you'll have the cover off any way, you could replace it with a cast cover with bearing support studs for strength, and fill/drain holes for easier fluid changes in the future.
      Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."

    14. #14
      Join Date
      Feb 2018
      Location
      Southern IN
      Posts
      144
      Country Flag: United States
      Quote Originally Posted by elwaupo View Post
      I’m not planning on Autocrossing, just a daily driver. I would like to go with 3.42 gearing and maybe a stronger diferential since this one is old.
      Depending on what you plan to upgrade down the road, you might consider building the 10 bolt that's in it now. For example, if you dream of one day swapping in a Quadralink, etc. then don't buy a 12 bolt now, buy it when you update the rear suspension and either weld the brackets on or buy it ready to go. That gives you room to get a narrowed unit without re-buying everything again.
      In my First Gen, I rebuilt the stock 8.2 10 bolt with an Auburn Pro Series posi, 3.55 gears and used the stock axles and C-clips (until a bearing failed years later) then upgraded to Superior axles until I went Quadralink/12 bolt. The car had a 427 big block, T10 4-speed and I ran BFG Drag Radials and the rear end held up fine till the day I sold it (aprox 20 years). I also welded the axle tubes 360° and reinforced the leaf spring perches. Keep in mind, there were no clutch dumping stupid sessions but you'd be surprised what a budget built, properly assembled 10 bolt can handle when it's not facing abuse at every turn, which sounds like won't be the case for you either. Just my $.02...

      Shane
      #theanchorholds
      68 Camaro build thread:
      http://lateral-g.net/forums/showthread.php?t=56387


    15. #15
      Join Date
      Jan 2008
      Location
      Elk Grove, CA
      Posts
      213
      I’m starting think that would be the best route. I picked up a 12 bolt that was for an early Nova. Turns out this rear end is a rare one since it’s casting date is late 1965. I was told I could buy 2-69 rear ends for what mine is worth since that one is very hard to find.

    16. #16
      Join Date
      Feb 2018
      Location
      Southern IN
      Posts
      144
      Country Flag: United States
      Quote Originally Posted by elwaupo View Post
      I’m starting think that would be the best route. I picked up a 12 bolt that was for an early Nova. Turns out this rear end is a rare one since it’s casting date is late 1965. I was told I could buy 2-69 rear ends for what mine is worth since that one is very hard to find.
      You’re correct there...if you wanted to sell it, Steve’s Nova Site would be a good outlet...lots of Nova purists there that would appreciate it. There’s also several Facebook groups specific to Novas that would be worth listing it on.
      Shane
      #theanchorholds
      68 Camaro build thread:
      http://lateral-g.net/forums/showthread.php?t=56387





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