Results 1 to 14 of 14
  1. #1
    casual poster panama's Avatar
    Join Date
    Feb 2011
    Location
    Perth
    Posts
    199

    Default 10 bolt salisbury ring gear diameter

    hi guys, looking at ring gear sets for 10 bolt salisbury and jegs has 2 sizes; a 8.5" and a 7.5"

    just wondering if anybody knows what diameter the "large salisbury 10 bolt" i have would be? currently has 3.55 gears in it and looking to go a little higher.
    WB 350 SBC T5 Ute

  2. #2
    Do you ever leave? EH179's Avatar
    Join Date
    Jan 2008
    Location
    Ipswich. QLD
    Posts
    3,710

    Default

    Do some more research, as i think you will find the Jegs ones are to suit GMC-Chev 10 bolts, which do not interchange with Holden 10 bolts.

    If it was just a matter of ordering from Jegs for new gears, we would all have done it, rather than going BW or 9"...

  3. #3
    Sure why not? 76lxhatch's Avatar
    Join Date
    Jan 2007
    Location
    NZ
    Posts
    5,787

    Default

    ^ Yep, you won't find any new gears for a large Salisbury (some time in the last 10-15 years everyone started calling them a 10 bolt, this is where the confusion with Chevy diffs all started). Also the only higher ratio gears available above 3.55 are 4.44 which is quite a jump (there is a 3.9 on paper but not sure anyone has ever clapped eyes on them, extremely rare if they do exist).

    Having said all that a clever machinist could probably make something similar fit, like Borg Warner/BTR M75 gears maybe. But it wouldn't be simple and definitely not bolt-in. To answer the original question if memory serves the crownwheel is around 7.5" in diameter, maybe a touch larger.

  4. #4
    been here .......too long Smitty2's Avatar
    Join Date
    Mar 2007
    Location
    bayside Melbourne
    Posts
    9,402

    Default

    Quote Originally Posted by 76lxhatch View Post
    ^ Yep, you won't find any new gears for a large Salisbury (some time in the last 10-15 years everyone started calling them a 10 bolt, this is where the confusion with Chevy diffs all started). Also the only higher ratio gears available above 3.55 are 4.44 which is quite a jump (there is a 3.9 on paper but not sure anyone has ever clapped eyes on them, extremely rare if they do exist).

    Having said all that a clever machinist could probably make something similar fit, like Borg Warner/BTR M75 gears maybe. But it wouldn't be simple and definitely not bolt-in. To answer the original question if memory serves the crownwheel is around 7.5" in diameter, maybe a touch larger.
    10 bolt.. ?always been a 10 bolt to me since I started with cars in the 70s but
    the confusion started when GMH introduced a small salisbury with a 10 bolt backing plate

    The Silver Fox Harry Firth had the 3.9s made and homologated for the A9X race cars
    and some were also around for the later VB on cars... but scarcer than hens teeth these days
    P/n for the set is 92007620 (pinion is 92007621 and crown 92006722)

    size wise..?? I thought they were 7.8" but I have a 3.36 set on the bench (new diff build next year)
    so I will measure them tonight and let you know...

    the BW gears will never fit... one problem is the back spacing. The BW teeth on both
    the pinion and crown wheel are a different height to the Salibury so the gear set
    and the carrier and the housing would need machining. Plus you also need to
    re-harden the gear set (heat treat or carburize them) after machining and you
    need specialist help with that
    Last edited by Smitty2; 21-12-2018 at 08:16 AM.
    __________________________________
    ONE OF THE Aussie V8 MODERATOR/ADMIN TEAM
    Never late in an AussieV8!
    Club circuit racing...the best fun you can have with your pants on

  5. #5
    Sure why not? 76lxhatch's Avatar
    Join Date
    Jan 2007
    Location
    NZ
    Posts
    5,787

    Default

    7.8" must be about right, the last set I measured were a little over 7.5" as I said.

    Quote Originally Posted by Smitty2 View Post
    .... the gear set
    and the carrier and the housing would need machining. Plus you also need to
    re-harden the gear set (heat treat or carburize them) after machining ....
    That's what I meant by "it wouldn't be simple"! Anything is possible but if you can do that sort of engineering then its probably still easier and cheaper to change the whole housing out, especially if its a leaf sprung ute.

  6. #6
    been here .......too long Smitty2's Avatar
    Join Date
    Mar 2007
    Location
    bayside Melbourne
    Posts
    9,402

    Default

    Quote Originally Posted by panama View Post
    hi guys, looking at ring gear sets for 10 bolt salisbury and jegs has 2 sizes; a 8.5" and a 7.5"

    just wondering if anybody knows what diameter the "large salisbury 10 bolt" i have would be? currently has 3.55 gears in it and looking to go a little higher.
    bit more on this whole topic here


    https://www.aussiev8.com.au//driveli...bury-diff.html
    __________________________________
    ONE OF THE Aussie V8 MODERATOR/ADMIN TEAM
    Never late in an AussieV8!
    Club circuit racing...the best fun you can have with your pants on

  7. #7
    casual poster
    Join Date
    Nov 2018
    Location
    Sydney
    Posts
    46

    Default

    The Chev 10 bolt has a 8.2" ring gear. So does the 10 bolt BOP [ Buick Olds Pont ]. The BOP uses a larger pinion brg & is stronger than the Chebby. Pontiac uses a larger U joint also, 1.125" cups v 1.063" for the Chev 1310.

  8. #8
    casual poster panama's Avatar
    Join Date
    Feb 2011
    Location
    Perth
    Posts
    199

    Default

    Quote Originally Posted by 76lxhatch View Post
    ^ Yep, you won't find any new gears for a large Salisbury (some time in the last 10-15 years everyone started calling them a 10 bolt, this is where the confusion with Chevy diffs all started). Also the only higher ratio gears available above 3.55 are 4.44 which is quite a jump (there is a 3.9 on paper but not sure anyone has ever clapped eyes on them, extremely rare if they do exist).

    Having said all that a clever machinist could probably make something similar fit, like Borg Warner/BTR M75 gears maybe. But it wouldn't be simple and definitely not bolt-in. To answer the original question if memory serves the crownwheel is around 7.5" in diameter, maybe a touch larger.
    just because people have been looking for ages doesnt mean that nothing new comes out; i dont know how new they are but jegs is listing a 7.5 and 7.625 inch gm 10 bolt below which would suit the dimensions you gave. might have to pull the case off the back of mine next oil change and see what the verniers say then send jegs an email...

    https://www.jegs.com/i/Spicer/094/2020395/10002/-1
    WB 350 SBC T5 Ute

  9. #9
    casual poster panama's Avatar
    Join Date
    Feb 2011
    Location
    Perth
    Posts
    199

    Default

    Quote Originally Posted by Smitty2 View Post
    cheers smitty, i did see that thread and read all 3 pages but it's from 2015 so i wondered if something may have come out since then. who knows.
    WB 350 SBC T5 Ute

  10. #10
    Sure why not? 76lxhatch's Avatar
    Join Date
    Jan 2007
    Location
    NZ
    Posts
    5,787

    Default

    Quote Originally Posted by panama View Post
    just because people have been looking for ages doesnt mean that nothing new comes out; i dont know how new they are but jegs is listing a 7.5 and 7.625 inch gm 10 bolt below which would suit the dimensions you gave. might have to pull the case off the back of mine next oil change and see what the verniers say then send jegs an email...
    As Smitty said you need to match a lot more than just the crownwheel diameter to get something that will fit without significant machining, and you will need to disassemble it completely to get those measurements. I hate to dash your optimism but unfortunately in this case I highly doubt new gears will ever be reproduced for the Aussie made Salisbury, there just isn't enough volume in the market.

  11. #11
    been here .......too long Smitty2's Avatar
    Join Date
    Mar 2007
    Location
    bayside Melbourne
    Posts
    9,402

    Default

    Quote Originally Posted by panama View Post
    hi guys, looking at ring gear sets for 10 bolt salisbury and jegs has 2 sizes; a 8.5" and a 7.5"

    just wondering if anybody knows what diameter the "large salisbury 10 bolt" i have would be? currently has 3.55 gears in it and looking to go a little higher.

    just measured the 3.36 set on the bench
    my machinist steel rule says .... 7.7"
    __________________________________
    ONE OF THE Aussie V8 MODERATOR/ADMIN TEAM
    Never late in an AussieV8!
    Club circuit racing...the best fun you can have with your pants on

  12. #12
    casual poster panama's Avatar
    Join Date
    Feb 2011
    Location
    Perth
    Posts
    199

    Default

    cool, thanks for the confirmation guys
    WB 350 SBC T5 Ute

  13. #13
    Senior Member
    Join Date
    Feb 2018
    Location
    Brisbane
    Posts
    536

    Default

    Iíll swap you for a set of 4.44ís

  14. #14
    casual poster panama's Avatar
    Join Date
    Feb 2011
    Location
    Perth
    Posts
    199

    Default

    hah; nice try. i'm not going 4wding with it. keep looking and you find a set of 3.55 of your own. mine have been copping a floggin lately anyway.
    WB 350 SBC T5 Ute

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 10 bolt salisbury torquing ring gear to case
    By starks in forum Holden V8's
    Replies: 2
    Last Post: 17-11-2014, 08:41 AM
  2. Widsor 289 starter gear ring?
    By neilferguson in forum Ford V8's
    Replies: 3
    Last Post: 19-06-2012, 08:26 PM
  3. Salisbury 10 bolt re-gear
    By shane308 in forum Driveline & Suspension
    Replies: 6
    Last Post: 31-05-2012, 05:45 AM
  4. Wtb 3.55 salisbury diff gear set.
    By 1TUFHK in forum Wanted (cars & items)
    Replies: 1
    Last Post: 18-02-2012, 12:57 AM
  5. Replies: 9
    Last Post: 01-09-2010, 03:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •