63 rear end gear ratio options

[Bob R.]

Re: 63 rear end gear ratio options

On my 63 the numbers after the code in my case CJ are the date 5 4 63 May 4 63.

[Thomas B.]

Re: 63 rear end gear ratio options

So yours reads CJ5463? Maybe mine is service replacement.

[Bob R.]

[Thomas B.]

Re: 63 rear end gear ratio options

I'll crawl under and check it again tomorrow. Maybe I didn't get the whole thing. It's possible I missed the 63.
129 would make sense for my build date of mid Feb 63.

[Harry S.]

Re: 63 rear end gear ratio options

An Example...

63 Diff.jpg

And CX is a 3.70 open for close ratio

[Thomas B.]

Re: 63 rear end gear ratio options

Took another look at the axle code this morning and it's quite hard to read but now I see CX 1 29 63. I missed the 63 previously. Date is correct for a mid-Feb build date.

So is it correct to be coded CX if it is posi? I assume "standard" means non-posi.

[Thomas B.]

Re: 63 rear end gear ratio options

Seems odd that the 3.70 axle ratio is the only one where positraction is optional with the 340 hp and 360 hp 4-speed. Even the 3.08 is mandated as posi. Any guesses as to why that is?

[Thomas B.]

Re: 63 rear end gear ratio options

Just took another look at the chart of G81 optioned cars in the initial post in this thread. If you do the math there are 318 L84 or L76 cars that were made with standard axle (Code CX).

Also looking at the powertrain chart, I suppose you would get the base 3 speed trans if you didn't select M20 option. Does Noland's book give a breakdown of transmissions vs engine options? Were there any L76 or L84 cars built with 3 speed trans?