BX axle code?

[Kurt S]

I don't believe the factory gears were stamped high impact. Just the ordering changed, not the gears.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ss427copo</div><div class="ubbcode-body">Yup.....they sure were. Stamped high impact. </div></div>
Those don't appear to be the original gears. I see a date on the ring gear of 3 70.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bwag</div><div class="ubbcode-body">Jeff , Did you notice the date code on your broken pinion gear June 69 ? We had 4.56,4.88,5.13 and 5.38 gears in and out of the car over the years. The 4.88s seemed to be the best combo overall.Some of the gearsets we used were the hi impact gears. Bob </div></div>
I don't see a June date - I think that's the part #. Just a date on the ring gear of 3 70 (7 is hard to see) and maybe the same date on the pinion, but I can only see the month code (3).

[ss427copo]

Thanks Bob for clearing up the BX question.
It is nice to be able to say, &quot;hmmmm, I wonder about this, let me check with the guy who ordered the car&quot;

[mockingbird812]

So Kurt, are you saying that a 9561 ordered '69 Camaro would get the hardened ring and pinion for the 4.10, but not a 4.56 or 4.88? Are 4.10 R&amp;Ps ordered via the COPO 9561 stamped &quot;high impact&quot;?

[Kurt S]

Yes, BE axle components were unique in their heat treatment.

I've only seen high impact on service parts.

[Fast67VelleN2O]

I believe there is a known COPO 4.56 axle for a 1969 Camaro that has heat treated 4.56 gears and a COPO posi unit.

[Kurt S]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fast67VelleN2O</div><div class="ubbcode-body">I believe there is a known COPO 4.56 axle for a 1969 Camaro that has heat treated 4.56 gears and a COPO posi unit. </div></div>
And was it in a COPO 427 car?

Its always been my understanding that in 69 a 4;56 or 4;88 could have been either dealer installed or COPO ordered.If the axle tubes are stamped BWor QG, or for the 4;88 gears BX or QH, that is a definate indication they were COPO ordered.

[Fast67VelleN2O]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fast67VelleN2O</div><div class="ubbcode-body">I believe there is a known COPO 4.56 axle for a 1969 Camaro that has heat treated 4.56 gears and a COPO posi unit. </div></div>
And was it in a COPO 427 car? </div></div>

I believe it was. It was talked about on here in a previous thread about COPO axles.

[Kurt S]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fast67VelleN2O</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fast67VelleN2O</div><div class="ubbcode-body">I believe there is a known COPO 4.56 axle for a 1969 Camaro that has heat treated 4.56 gears and a COPO posi unit. </div></div>
And was it in a COPO 427 car? </div></div>

I believe it was. It was talked about on here in a previous thread about COPO axles. </div></div>

Sounds right - 427 cars would get different heattreat - be it the 4.10 that most got or the 4.56 that a very few got.
A 4.56 gear in a 69 Z would be normal gears.

[firstgenaddict]

Yes and the car has legit paperwork. It is a white 427 COPO car I saw it at Super Chevy Atlanta 10 years ago or so.