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10 bolt 8.2?


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I have 2.73 gears on my TH 350 trans 350 SBC ‘72, just confirming that it’s a 10 bolt 8.2 based on the photo below of the diff cover, is this right?

D0D34F7F-90F3-4B24-8A2C-9DA1B0FF3ADE.thumb.jpeg.0d3022bc2435689c6de4b1c87b0e2eca.jpeg

(Sorry about rubbish photo). Based on that, would the strange 3.55 be too extreme a change? Looking for a nice torquey feel but will drive the occasional motorway and needs to be a little bit practical!

https://www.opgi.com/drivetrain/differential-rear-end-components/rear-end-gear-assemblies/gearset-us-82355-c220043.html

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I avoid OPGI if at all possible I hav ehad problems in the past with stuff being out of stock after I place my order. On somthing like this I would use a manufacturer or reputible dealer

 

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I too check OPGI sometimes for part numbers. But wouldn't recommend when your looking for performance enhancements. Strange has a international dealer locater on their website, link below. 

I can't answer your motorway question with new gears, I have 355's in my 70 but that's a whole different story. 

One thing I would recommend, if your doing new gears replace the axels also. Along with me there are a few members that have gone with Strange axels. And now we get into what is lovingly called the snowball affect lol.

I don't know enough about what I'm about to say, I'm sure others will chime in with more knowledge, I'll just tell you my experience, my 70 had a 12 bolt posi with the 2.73 gears. My buddy had a "in stock" 355 ring and pinion that he gave to me. When we went to do the upgrade my stock posi was a series 2 unit, his gears were for a series 3 unit. Luckily he also had "in stock" a series 3 unit. 

Just saying, make sure you know what you have and prepare for the possible additional parts and pieces you may end up having to need. 

https://www.strangeengineering.net/contact-us-international/

 

 

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Here are some better photos, looks like 12 bolts to me after all. I can't make out the number near the left axle. do I need to open her up and get part numbers / count cog teeth? Is there any way to get details from the protect-o-plate?

12-bolt.thumb.jpg.9449fb4a920e5314118e335478c7a85e.jpgIMG_0225.thumb.jpg.e3f3744c6093a24a00c94bce6c67628f.jpgIMG_0226.jpg.54ce419c398ce31bd802e4c8707f333b.jpgIMG_0227.jpg.ab16aadd66f7659fc19e8dbe2937189d.jpg

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Passenger side axle tube, front side, about 1/3 of the tube away from the pumpkin there should be numbers stamped in the tube.  Not easy to see or find so don’t use a grinder. That will tell you what was in the rear from the factory. 

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Yes, that looks like a 12 bolt.... 

As for changing up the gears, anything higher than 2.73 will require a "type 3" carrier as well as the ring and pinion gear. 

3.55 will give you a nice "around town" feel, and not too painful on the open road. (probably around 3200-3500 rpm's at 100 km/h)

Here's a photo of a 3.31 non positraction gearset.... 43/13. The last 4 numbers give you the ratio.

 Montelishi7.thumb.jpg.dd5cb669398b375033a084357aa5348f.jpg

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