A guy has a set of new 3.73 gears and installation kit for 10 bolt 7.5. Talking to him on the phone he sounded older and said the box doesn't have a part number and he could only see a few random numbers stamped in the gears. I do believe them to be 10 bolt 7.5 3.73 gears.

My only concern about the gears is if they are for a 2 series or 3 series carrier. I have a 3 series carrier.

Is there any visual way to tell if the gears are for a 2 or 3 series carrier? The only other information I got from him is that he put a tape measure on the ring gear and it measured 1.5" from the flat mounting surface to a tip of one of the teeth on the inside of the ring.

I would go have a look but he is 2.5 hours away. I am going to that city in a week and a half and it would still be a hour round trip to go see him. I wouldn't want to waste my time.

 

The flange on the carrier for the ring is .400" farther away from the pinion CL in a 2 series carrier than a 3 series.



2 series on the left, 3 on the right.

The "thick" gears have a "taller" section between the flange and the teeth, by that much. "Thick" 3.73s are about ¾" tall or so at that spot. The gears in the pic that are still on the 2 series carrier are I believe (don't know, it's not my pic, I just ganked it off of some unsuspecting fleabay seller or something) 2.73, which are only slightly thinner than "normal" 3.73s on a 3 series carrier.

Sounds to me like they're the "thick" version. Butt I could easily be wrong. And not only wRong, but possibly mistaken on that particular point.

 

From the ad is a picture of a picture. Lol.

Would there be actual markings on the gears to indicate what they actually are? He doesn't even know the brand.

He's asking $150 cad or about $100 USD for gears and kit, which would be a good deal if they fit.

 

There should be a part# on the ring.

 

I will have to have a look in person. The old guy says "numbers so faint, won't show up in a picture".

 

Interestingly enough the gears have no stamping except for "65" on the pinion.

There are tags with stuff written on them but of course it is mostly missing.

The gears come with a Motive Gear installation kit. Perhaps the gears are Motive? They appear to have been sitting for quite some time.

I did find a Motive Gear quick tip chart that lists 7.5" Thin having a 1 7/16" overall height and 7.5" Thick having a 1 3/4" overall height.

These gears are 1 7/16" thick

 

Looks 3 series (not thick) to me.

The whole no-name no-number deal isn't real encouraging. Gears aren't all that $$$; IMO not the ideal place to try to save a few $.01s.

3.73 is 11 on the pinion and 41 on the ring.