SUCCESS vs Trouble finding rear seal for Duster transmission

-
Ken71Twister

Ken71Twister

FABO Gold Member
FABO Gold Member
Joined
Mar 26, 2011
Messages
319
Reaction score
103
Location
Valparaiso, FL
I pulled the rear seal out of my 3 speed manual today (71 Duster w 318) and went to two auto parts stores and left with a seal that doesn't fit. What is the best way to find a seal that fits? Depending on how I count, the shaft has 25 splines with a gap that would be space for a 26th spline. Auto Zone and Advanced Auto Parts didn't come up with a match. One of them sent me home with a seal that might have fit into the transmission, but the inner seal was too small for the shaft that needs to go thru it. I've measured the shaft and the seal diameters. Is there a good source where, based on the diminsions I have, I can track down the part online or would I be better off letting one of the parts stores try a bit harder?


Tried another store today and, after the person helping me was ready to order the part - I asked that he verify the dimensions first. That check revealed that it was the wrong part. After more searching online, he looked at my part and found a number stamped in a hard to see place - but HE FOUND THE PART NUMBER. He located the part and it should be at the store in a couple of hours.

Lessons Learned -1) the part number is stamped on the inside where it is really hard to see. 2) There are a lot of seals out there for the 1971 3 speed transmission that don't fit. 3) When you drill a hole in the seal to help with pulling it out - stop drilling after the first layer is penetrated. (I hope I didn't screw something up behind the seal. The peice of metal behind looks okay).

Thanks to all who helped.
 
You need a National Seal # 2506. It fit's an A230 3 speed trans with 26 spline output shaft. It should be 1.558" ID, 2.376 OD. Does that match your measurements?
 
Thanks for the lead and, in theory, the seal you suggested should be the right one. However, I've measured the diameter of the seal many times and the OD is smaller - approximately 2.255" rather than 2.376". The existing seal seemed to be a tight fit when it came out. The shaft size checks out with the part you suggested (I measured 1.560" vs 1.558"). My car came off the assembly line in late June '71 - the last week that the car was produced as I recall. I wonder if they stuck in a '72 transmission. I had the transmission repaired back in the mid 80's and I recall the AAMCO shop owner told me that he had a heck of a time getting the right parts.

Guess I'll keep digging and see what I find and I'll report back.

tx,
Ken
 
Ok, how about a National # 8935s. It fits the late 60's A745 trans, and it's listed as 2.254 OD, and 1.558 ID. Most likely somebody did a trans swap some time in the past.
 
dusterglenn said:
Ok, how about a National # 8935s. It fits the late 60's A745 trans, and it's listed as 2.254 OD, and 1.558 ID. Most likely somebody did a trans swap some time in the past.
Click to expand...

http://www.oreillyauto.com/site/c/d...019&ck=Search_8935s_1232019_164&keyword=8935s

Detailed Description


Shaft Size: 1.558 in. (39.57 mm.)
Housing Bore: 2.25 in. (57.15 mm.)
Outside Diameter: 2.254 in. (57.25 mm.)
Flange Outside Diameter: 2.515 in. (63.88 mm.)
Width: 1.52 in. (38.61 mm.)
Material: Nitrile
 
You must log in or register to reply here.
-

Back
Top