I have a set of 3.73 gears 41 and 11 teeeth


my problem is i got ripped on a deal on these gears I have are NOT what they were supposed to be ( swapped box)


I was wondering how I can tell if these were ment to be mounted on a series 2 or 3 carrier
The only marknigs on them are ....

ON THE CROWN GEAR
there is a little smear of some wierd brown paint ( seemed like a richmond paint code for 3.73's ) and then there are these marks
< > ....so whatever they are ...and also this " MG"
ON THE PINION
there is a " MP"
these are the ONLY markings on the gears . Please help me ...as I need to know if I have to buy a carrier or not .

thanx thirdgen

 

...even some insight on where to look ? or someone to ask ?

 

yeah.... a 2-series carrier goes from 2.73 to 3.08. youneed a new carrier. check the eaton posi units or an auburn pro series. also, measure the diameter f the ring gear. if it's 7.5 or 7/58, you can use it with a different carrier in your 10-bolt housing. if it's bigger, you better find a 12-bolt.

 

K ... I appologise for being so vague


they are for my 10 bolt rearend ..... they are 3.73's . They make 3.73's for both a series 2 and 3 carrier . I just don't know how to find out which I have . I have tried GM ( they had no clue hpw to tell me ... go figure) Richmond says .... they arent there gears ....so they have no way to tell which ones they are for .



Please help ... I am at a loss here . For some reason ....... nobody seems to know a way to check this

 

MG = Motive Gear

MP = I don't know, but if I were to guess, I'd guess they're a production code of some sort, like the plant they were made in

Think about the meaning of "3-series" and "2-series" gears for a minute. Imagine that you're designing a rear end, and you're starting out with a high ratio, let's say 4.10, and you're drawing up gears for progressively lower and lower ratios. Keep in mind that the ratio is not only the ratio of the number of teeth on the R & P, but also the ratio of their diameters; and since the ring gear is a fixed diameter for all ratios, that means that as the ratio decreases, the pinion must get larger So, if the carrier flange where the ring gear mounts to it is the same, the ring gear must get thinner and thinner as the ratio decreases.

Eventually you'd get to a point where the ring gear had no thickness at all, or even negative thickness. This is clearly not practical in a mass production environment. So, when they get to that point, they move the ring gear flange farther away from the pinion centerline to make room for the huge pinion that goes with grocery-cart gears, and start all over with a thick ring gear.

Therefore, a high-ratio gear made to fit on a 2-series carrier must be very thick. In this particular model of rear end, they make the break between 3.08 and 3.23 ratios, and the ring flange is moved over about .400". So, the "special" 3-series gear for a 2-series carrier is about .400" thicker than a real 3-series gear.

Here's a pic of a normal 3.73 gear. Look at your ring gear, and compare it to the circled area in this pic. If your gear is about the same thickness, it's a 3-series gear like this one. If it's about .400" thicker in the circled area, it's the "special" kind.

 

thanx a bunch man ! here are mine . After reading your post I would consider this a series 2 set of 3.73's ......

I will try motive .... to see if they can say for sure .

Thanx a bunch for the advise