Help ring and pinon p/n

[Grandpa54]

Im tring to find out if this ring and pinion part number 3824446 will fit a 65 1/2 ton. The add says 63 to 64 but arent they all the same? Thanks mark

[1963c-10]

63-64 chevy c-10's were 17 spline axles. 65-66 chevy c-10's were 30 spline axles. Same 12 bolt housings.. you must be talking about the NOS 63-64 3.07 gears on ebay? A lot of companies make the 30 spline gears....check into Summit racing.

I believe the GMC's were Dana 44's and not sure on the 3/4 -1 ton.

[Grandpa54]

Doesnt the axle go in the spider gears? Yes it the one on ebay. I just thought gm would be better? Thanks mark

[60-66]

Your looking for part number 6250541 fits 65-72 3:73 12 bolt 1/2 ton

[Grandpa54]

Can you explain the difference, try to educate my self, thank mark

[1963c-10]

That's a question for someone with more experience on rear ends than me. I believe the gears will work, its the axles that won't interchange.

[1963c-10]

Heres the part in question:

[60-66]

also, and if you are looking for the 3:07s your looking for 6260537

[Grandpa54]

Originally Posted by 60-66

also, and if you are looking for the 3:07s your looking for 6260537

thanks so much for the info, mark

[60-66]

Well, Im guessing here but by the GM Part numbers AND my parts books in each case, the 3:07s and 3:73s do show a different part number for the ring gear, pinion is the same part number as 65 and up. So the ring gear could be cut different for the inside diameter or the bolt holes could be different to match up to the case, could be something else ? Im looking in later issue GM books and normally if it was the same they would have changed the part number to fit all. Hope this helps

[1963c-10]

Any reference for the 3817776 stamped on the pinion? I assume the 14 43 stamped in is for the 3.07 gear?

[60-66]

Originally Posted by 1963c-10

Any reference for the 3817776 stamped on the pinion? I assume the 14 43 stamped in is for the 3.07 gear?

Correct, 3;07 pinion gear, the ring gear is 3817779 and OOPS looks like I need to edit what I said earlier, its NOT the ring gear that's different its the PINION and by what Ive traced it now to is the yoke fits 60-64 and 65-72 up is different so Im going to check the spline count on the front of the pinion

[60-66]

OK, heres the difference, on the left 63-64 pinion, on the right 65-72 .

[Grandpa54]

Originally Posted by 60-66

ok, heres the difference, on the left 63-64 pinion, on the right 65-72 .

so which one do you think is better? The 63 64 looks heavier dosent it.

[60-66]

Not really , coarse spline is weaker , the fine spline is the stronger one

[Grandpa54]

Originally Posted by 60-66

not really , coarse spline is weaker , the fine spline is the stronger one

60 66 thank for all the info and all the time you put into this,mark

[Captainfab]

Those gears should fit any truck 12 bolt housing with the correct series carrier and the correct yoke.