got burned on a used rear end

[sidb913]

I bought a rear-end supposed to be a 3.73 , cant find anything on the web?
40:1326268 & the number 5251 and just a big number 4 ?
I would like to buy or build a posi 3.73
who do I go to in the Dearborn area ?
if someone can help please. now I have my GU2 rear end that was on my car with disk brakes
and I have another with drum brakes, the one with drum brakes don't seam right. when I turn the studs (where the wheel would be) the end where the drive shaft would bolt on to don't turn, but it did when I bought it, would that have anything to do with gravity or the way I have it on jack stands?

[1BADAIR]

Not a limited slip. Is the other side Turing the opposite direction

[hoogiesngrinderz]

I'm betting 40:13 is the ratio (40 tooth ring, 13 tooth pinon) meaning you bought a GU3 3.08 rear end.

[sidb913]

ill take a better look and let you guys know, my stock is a GU2 2.73 disk brake with a G80 code? is that good? the G80 part.

I don't think ill be over 350 HP, I just want to have a little fun, I know a 3.73 would help. is it worth investing in my rear end?

[hoogiesngrinderz]

ill take a better look and let you guys know, my stock is a GU2 2.73 disk brake with a G80 code? is that good? the G80 part.

I don't think ill be over 350 HP, I just want to have a little fun, I know a 3.73 would help. is it worth investing in my rear end?

You can't use that carrier unless you get the specific 3.08+ gear made for a series II carrier (thick ring gear)

[sidb913]

So what do I have, a series ll?
Is that good? I want a 3.73, sorry with all the questions, I just don't know anything about a rear end, except how to take it out and put it back in.

[sidb913]

What's my best option?
Wait until I could afford 1,000 ?

[hoogiesngrinderz]

Just need to order gears made for the series II carrier instead of series III

[sidb913]

I HAVE A 7.5 3.08 DRUM SET UP REAR END , WHAT IS IT WORTH, I PAID $130 FOR IT , DO YOU THINK I COULD GET MY MONEY BACK?
I JUST DRAIND THE FLUID AND COUNTED ALL TEETH 40/13 =3.08 GEAR.....

[hoogiesngrinderz]

Hard to say, but I think $130 is a bit much for a 3.08 open diff with drums.

The last rear end I picked up was $160 for a very clean 3.42 open diff with discs. I swapped in a truetrac carrier in it and called it good.

[sidb913]

Thanks