I ordered a new set of gears from richmond and i got to installing them and noticed that tha ring gear is about !/2 inch thicker than the original!!! the ends of the teeth come right up to the center pin hole and i dont know if i would even be able to put the pin in. I ordered the gear with information given to me by a few people. I ordered:
gm 7.5" 10-bolt 3.23 for 2 series carrier (or 3.08 and lower) 26 spline axles blah blah blah.
I have 82 trans am with posidisc. I ordered the right ones, right???

 

What gears were in it previously? Since it is an 82, the stock carrier/gears may have already been swapped out--you may have a 3 series carrier. Or, it could be you switched gear ratio to a deeper ratio. The deeper you go, the smaller the pinion gear must be, and the thicker ring gear is.

 

what came out was 13:42 and I ordered 13:42. the pinion is the same size as the old one but ring gear is not of course... what are the splines for the axles and pinion for the 3 series? I suppose it could have been changed bu even so for this ring gear to work the end of the carier woul be pretty close the the side. a junkyard offered me a rear end for $175 complete, if he has one. that wouldnt be so bad except I have dic brakes. but I was wondering, all the housings are the same right? so if i took a gear set out of another housing from an 82 and swapped those gears into mine would they line up (pinion depth for the matched set) then I would have spare axles at least... what do ya guys think?

 

If I'm reading this correctly, You took out a set of 13:42 gears that were on a 3 series carrier.

You are trying to install a set of 13:42 gears that are intended for a 2 series carrier.



Get the right gears.

 

JMD is right. 13:42 is a 3.23 gear ratio, which if stock, came on a 3 series carrier. If you bought 2.23s specially sized to fit on a 2 series carrier, it will NEVER fit. I don't know who gave you your information, but I'd have a little talk with them...

 

I agree exactly with jmd and GMTech, I also think they are describing exactly what is happening. You simply have the wrong gear.

 

somebody also told me that 3 series carrier didnt come out until like 86 or somehting and that there is a difference in the axle spline between the two. anybody verify this so I can go count? getting the wrong gears sounds like a logical answer to the problem but what is it doing on an 82?

 

The number of axle splines has nothing to do with 3-series vs. 2-series. Carriers have always been designed in ratio "series", since they were invented. In fact, in the old GM 12-bolt among others, there was a 4-series carrier too, used mostly in trucks.

Think about gear ratio for a minute. There's more to it than just the number of teeth: the diameter of the gears also has the same ratio. That means, since the ring gear is the same diameter in all ratios of a given model of rear end, that as the numerical ratio increases, the pinion must get smaller. That also means that the ring has to get thicker, to "move over" to where the smaller pinion is. Eventually the ring has to get so thick that it is too expensive to make; and instead they make a carrier with its ring mounting flange moved over, and start over with a new series of ring gears. In the 7½" GM rear, this occurs between 3.08 and 3.23 ratios, in both the early ones with 26-spline side gears, and the late ones with 28-spline ones (which incidentally can be interchanged within the carrier itself when they're available for the particular carrier in question).

So what you now have in your posession is a ring gear that's extra-thick so you can install it on a carrier that has its flange farther from the pinion because it's designed to accommodate a large pinion; but since your carrier's flange is actually in the right place, that's the wrong gear for your setup.

 

Sounds like you need to find new "sombodies" to talk too, or at least ask us first. Ditto everything RB said. Carrier series and Axle spline have absolutely nothing to do with each other. You either need to get a 2 series carrier and use the new gears, or sell the gears and get 3.23s for a 3 series carrier.

 

You're taking information and mixing it up. 28 spline axles for the 7.5 came out in 88 or 89. The two different carriers have been around since the beginning of the 7.5 and well before that for other differentials. Write down what people tell you, so you can refer back to it later.

 

I'm never asking those guys for info again, thanks a bunch it better knowing the problem than being totally confused. :hail:

 

do I have to have any kind of load on the carrier to get an acurate print? the print I'm gettin is far on the heel (or outside) of the gear. I'm using the original shim with new bearing. also, my yoke sticks out a bit further that it used to (I think) is this ok???

 

No.

Reshim.

 

alright, I got her together and she moved down the road withough a clicking grinding noise. is it natural for it to hum quite loud in break in? the old one had a hum to it but this is much louder when I'n going down the road withought putting much pressure on it.

 

???

 

Richmond gears are known for having a hum to them, but I have never had a set so I dont know how noticable it is. Why were you replacing your gears with the same ratio as you had before by the way? Were they broke?

Ben

 

they were replaced because the pin bolt went through them. same ratio, little more noise.