Throwout bearing question

Posted By: 1970RT

Throwout bearing question - 02/03/14 09:26 PM

I was going through a box of old Mopar parts I have and came across a couple of throwout bearings. I am an automatic guy so I don't know much about 4-speed stuff. What I would like to know is are throwout bearings small and big block specific? If so, how can I tell the difference in order to figure out what I have?

Posted By: 68LAR

Re: Throwout bearing question - 02/03/14 09:56 PM

Small and big block TO bearings are the same, but there are 2 types. One for a 23 spline and one for an 18 spline transmission.

Posted By: Cab_Burge

Re: Throwout bearing question - 02/04/14 04:53 AM

Quote:

Small and big block TO bearings are the same, but there are 2 types. One for a 23 spline and one for an 18 spline transmission.

Not so on all Mopar applications, if it is a passenger car then that may apply

If thier from a pickup, van or a larger turck maybe not

I've seen some that are a lot different in the length of the mounting collars between the clucth fork and bearing mounts positions

Posted By: 1970RT

Re: Throwout bearing question - 02/04/14 05:20 AM

Here is a picture of both bearings. They both have 1 5/16" holes in them. They are the same height but notice the difference in the shape on the bottoms ends.

Attached picture 8025858-MVC-158S.JPG

Posted By: 68LAR

Re: Throwout bearing question - 02/04/14 08:04 AM

Quote:

Not so on all Mopar applications, if it is a passenger car then that may apply If thier from a pickup, van or a larger turck maybe not I've seen some that are a lot different in the length of the mounting collars between the clucth fork and bearing mounts positions

Sorry, MY BAD. I thought we were talking about cars.

Posted By: 1970RT

Re: Throwout bearing question - 02/06/14 08:56 PM

Is the difference in the shape of the two bearings in the picture I posted of any significance?

Posted By: 68LAR

Re: Throwout bearing question - 02/06/14 09:04 PM

No. The difference in the thickness of the bearing its self is due to the manufacturer. The mounting body looks identical. The difference between a 23 spline and an 18 spline is the inside diameter of the mounting body/bearing. The bearing you have pictured look like car bearings. Admittedly, I know very little about truck bearings. They could be the same or different. I you couldn't prove it either way by me.

Posted By: KillerBee

Re: Throwout bearing question - 02/06/14 09:38 PM

Interesting....I would like to know the difference also....

Here is a supposed Hemi release bearing that doesn't look anything like the pictured ones.

http://www.ebay.com/itm/OEM-Mopar-HEMI-4...tr#ht_932wt_788

Posted By: John_Kunkel

Re: Throwout bearing question - 02/07/14 01:14 AM

The Hemi T.O. bearing has a larger center hole.