When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Couldn't agree more, but don't have a picture. Carrier has been removed and ring gear removed from carrier. No numbers in the casting, front or back. Supposed to be posi with 3.42's for an "O" type.
I am slated to purchase this posi carrier and gears for my 70 Cutlass with "O" type rear. Everything I have read and viewed, SuperCars site as well, says carrier has numbers cast into it identifying what series the carrier is.
Has anyone seen a GM carrier without casting numbers? I am beginning to wonder if it is something other than an "O" type?
Please help! I am going to have to make a purchase decision fairly quickly.
Anyone who cannot tell a posi carrier from an open has no business touching the assembly with tools.
That said, no, I have never seen a GM carrier with no cast-in ID numbers, indicating it may not be a GM part.
Surely the ring gear itself has the tooth counts stamped into it, from which the most basic of math will reveal the gear ratio?
Not that this info would ensure that this part fits into and works in a '70 Type-O rear end... Sounds like a gamble. Can you take it to a local gear shop and have it looked at by folks who do this all day every day? Just based on how hard it is to find '70 Type-O parts, I would say, "not likely".
I should be getting pics today. Parts are out of town. The rarity of the parts is keeping me in the game. When Joe P, Brian Trick, and Monzaz say they have never seen this it has me wondering. Will post pics when they come it.
"A friend is looking at an Olds "O" Type Rear End. Pulled the supposed posi carrier out and unbolted the ring gear. "
This still has me puzzled.
If it was an entire rear end, why not just buy it and be happy?
Why pull out the carrier, and having done that, why remove the ring gear as well??
There's a lot of red flags here.
One can spot a posi immediately after removing the cover. Or, by simply turning one axle vs the other. So, that should not be an issue. Either it is, or is not, a posi.
If it was assembled, and working.... "if it ain't broke, don't 'fix' it" as they say.
To an extent, who cares if the carrier is a #673 real GM or aftermaket Eaton with no PN on it? If it works....
Problem with your solution Octania is that the parts are across the in Michigan and I am in Montana. Don't want to buy or ship an entire differential. Only need the ring and pinion and the posi carrier.
Were aftermarket Eaton Posi Units available for these at one time? Possibly someone changed it out previously--which is fine. I don't think the issue is identifying a posi. As you say, this is a quick visual. I am just a bit thrown by the lack of ID numbers on the case.
Problem with your solution Octania is that the parts are across the in Michigan and I am in Montana. Don't want to buy or ship an entire differential. Only need the ring and pinion and the posi carrier.
Were aftermarket Eaton Posi Units available for these at one time? Possibly someone changed it out previously--which is fine. I don't think the issue is identifying a posi. As you say, this is a quick visual. I am just a bit thrown by the lack of ID numbers on the case.
The distance thing is important to know. Changes the scenario as I understood it.
Does this person not have a phone that can take photos? Seems like it would be resolved real quickly.
here is a pic of the tooth count on a 2.78 ratio ring gear
NEVER BUY AN ITEM ON TRUST - IF YOU DO NOT KNOW THE PERSON. PERIOD.
Maybe if it is a reputable shop and you can send it back for a refund if the parts are not what they said they were.
Your doing all that you can do ...Just wait till it appears in pictures and you get confirmation.
IF it get bought before that...DO not fret...It I am sure is not the one one left in existence. Jim Mitschke
We will see. I won't buy without seeing pics and getting some feedback from Classic Olds. Its coming out of an O rear taken out of a car. All seems legit.
Who says it is a type o rear end, and based on what clues or indicators?
I have bought "big valve" C heads to find regular valves and the seller's response was "well... they were on a 4-bbl motor, so I ASSUMED..." rather than "I measured..."
Sellers are motivated to sell and often honestly do not know what they have, and sometimes just plain tell a buyer what they want to hear.
Surely when the cover was removed, the posi parts were visible, so that should be easy to verify.
In my limited diff internals experience, I have found that the 67-70 type O units do not interchange parts with others, and even within ratio ranges. You would be wise to have the experts such as mr trick take a look, tell you what to look for, etc. Maybe at least measure the OD and spacing of the carrier bearings.
Had it been left assembled, frankly, you would have been better off to spend the 100 or so on shipping and get the entire rear end. Putting one back together properly and set up well is not for the average "I can swap an engine" mechanic.
I have a feeling that you are going to get blurry pictures.
Not having a phone that can send pix RIGHT NOW while you talk to the person is a bit of a red flag. I'm pretty damn hillbilly but I have an iPhone.
Have to kind of agree...Motivated sellers get things done fast...rip offers beat around the bush...
Are you telling me he does not have a friend, son, family member that does not have a phone to take a few shots?
lol... Will see what happens...Let the drama unfold.
Please check out my other post under transmissions. I just got pics for manual trans parts I am slated to buy to convert my TH350 to M20. Thanks for taking the time.
Probably not the same seller but I just drove up into Michigan today for the exact same thing. 3.42 posi o type. I noticed you don't need to pull the carrier at all to see the casting numbers. The one I looked at was a TM code 3.42 with a 588 carrier. All right out in the open with the diff cover off.
Jim Mitschke
