1966 rear diff re-gear issues (1 Viewer)

[Oregon FJ40]

Well I thought I was making good progress, until I wasn’t. For reference, my project is a ‘66, but I replaced the front axle with a ‘76. Putting in new 3.70 ring/pinion from Nitro gears. Front diff going together just fine. Disassembled the rear and discovered that instead of nuts/bolts holding the rear ring on, it had threaded holes and bolts went straight into that to mount. Also found it was 9.25” in diameter.

I thought all the diffs were the same, clearly they are not. Did a quick search and found a thread from a few years back noting the same discovery.

Ring Gear size

I have two set of ring & pinion gears that supposedly are for an FJ40. Both ring gears have 37 teeth and the pinion has 9 = 4.11. Both have 12 mounting holes that match each other. This is the question: one ring gear measures approximately 9.25" side to side and the other measures 9.5". Was...

forum.ih8mud.com

@gwalt584 stated he then found information on Cruiser Outfitters website that answered his question. I went there and found that I could buy the special nuts/bolts but it stated that pre ‘69 carriers would need to be upgraded.

Went to their tech page and don’t see any info on what the carrier upgrade needs to be.

So my question is can i just put the 9.5” ring onto the ‘66 carrier with the new nuts and bolts that CO sells? Or do I need to buy a ‘69+ carrier?

Any input would be appreciated.

-Mike

 

[cruiseroutfit]

No, as our page indicates, you need the newer carrier too. Fortunately they are easy to source. If your gears came from us, we usually send out the install kit for the early stuff. Otherwise we offer them for sale. You may need a different install kit depending on what carrier bearings you purchased.

 

[Oregon FJ40]

No, as our page indicates, you need the newer carrier too. Fortunately they are easy to source. If your gears came from us, we usually send out the install kit for the early stuff. Otherwise we offer them for sale. You may need a different install kit depending on what carrier bearings you purchased.

I will PM you. Thank you for your quick response.

 

[cruiseroutfit]

I will PM you. Thank you for your quick response.

Please reach out to the team at the shop. I'm traveling a bit this week, they will have all the resources fo assist quickly! Contact Us - https://cruiserteq.com/contact-us/

 

[Oregon FJ40]

So I was able to obtain a ‘76 rear axle so now I have a new carrier I can use for this project. My new question on this is, can I use all of the ‘76 internals in the ‘66 housing? Ie axle shafts, carrier, spider gears…. Or do I need to use the complete ‘76 axle? As I have already cleaned, painted, resealed and new bearings on the old one, it would be nice not to have to go through that process again if I done have to.

-Mike