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Does this one have the bolt in the center of it, or is it held in with a ring around the end of the shaft?
You're just going to need to smack it good with a non-marking hammer. Use a block of wood in between if necessary. The ring will often get a little stretched and catch on the edge of the lip of the gear it is seating into, you just need to get it to compress to get it all the way in.
The shaft is splined- so when you put it in, you should be able to turn it and feel those splines start to engage right at the end of the shaft, and you won't be able to turn it any more- at that point, it is just the ring hanging you up, you know you are engaged in the splined gear, and you just need to smack it. Usually it is coming out that is the hard direction!
You could try removing the ring, seeing if it slides into place properly, and then reinstalling the ring and seating the shaft. If it has been dropped at all it may have a burr that is causing it to drag. If you're able to get it all the way in with a block of wood on the end of it when you are hitting it you should be OK
you can see inside and see the splined part that the shaft should slide into, correct? And there are no burrs on the shaft or on that part? Does it feel like it stops due to friction and binding, or like it suddenly hits a wall?
even without the ring?
and you only did the shaft seal on this one side?
sorry, was getting late last night.
I can't think of any other reason why it would not go in, unless you received the wrong seal or something (I have seen instances of the wrong seal being installed on these units)
Could you send me a picture of your output shaft, and if possible, get a picture of the transmission/transaxle?
when you insert the shaft, do you feel the splines engage so you know you are going into the carrier? Are there any marks on that spider gear shaft inside the transaxle from the axle hitting it? Have you tried measuring the length of the shaft, and the depth to the backside of the splined portion of the carrier?
Is it possible that the area directly on the backside of the flanged part, is hitting slightly on the lip of the smooth bore inside? Like if you tried wiggling it around to see if it will slip past that? Look on the lip of both of those parts and see if there is evidence that they are butting against each other when you were smacking the shaft in.