12 bolt 273 open to 373 posi

[Rich 71]

 

what will i need to make it work

[MC1of80]

Gears, posi unit, install kit with bearings, differential fluid, posi additive (if not using a trutrac) ,money, someone to set it all up correctly. 

[Scott S.]

And a type 3 carrier.... 2.73 gears are housed in a type 2.

[Rich 71]

thanks the carrier was what i was needing to know

[DragCat]

4 hours ago, Scott S. said:

And a type 3 carrier.... 2.73 gears are housed in a type 2.

I found that out the hard way 🤣

[DragCat]

6 hours ago, MC1of80 said:

Gears, posi unit, install kit with bearings, differential fluid, posi additive (if not using a trutrac) ,money, someone to set it all up correctly. 

X2 on the posi additive 

[DragCat]

Luckily I had experienced help when I did mine I upgraded the axels at the same time 

[MC1of80]

2 hours ago, DragCat said:

X2 on the posi additive 

Not if you go with the Detroit trutrac. No posi additive needed. 

[Scott S.]

I found it was easier to do it with the differential out of the car.

[Grant MacPherson]

Not to question your choice, changed my 2.56 to 3.42, was determined I wanted 3.73 but the shop that did it told me every past customer he had put 3.73s in were not happy. I am glad I went with his recommendation,  huge difference on take off and still able to cruise at 70 mph. 

[Scott S.]

16 hours ago, Grant MacPherson said:

Not to question your choice, changed my 2.56 to 3.42, was determined I wanted 3.73 but the shop that did it told me every past customer he had put 3.73s in were not happy. I am glad I went with his recommendation,  huge difference on take off and still able to cruise at 70 mph. 

Even better if you switch to an overdrive transmission.....

[420ponies]

If going this route, I suggest you get new bearings , seals also. Are you going to give it a try or find someone to set it up for you? I have a Yukon Posi-traction unit in mine. I also upgraded to Moser Street axles.