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727 or 904 converter? #2025758
03/06/16 02:18 PM
03/06/16 02:18 PM
Joined: Jan 2003
Posts: 2,108
New York
rarefish Offline OP
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How do you ID a torque converter to determine if it's for a 727 or a 904 trans?

Re: 727 or 904 converter? [Re: rarefish] #2025791
03/06/16 03:44 PM
03/06/16 03:44 PM
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Las Vegas, NV
6bblgt Offline
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IIRC the 727's keyed imput "lug" is blush 1.875" in diameter, the 904's is smaller.

Last edited by 6bblgt; 03/07/16 01:32 AM.
Re: 727 or 904 converter? [Re: rarefish] #2025798
03/06/16 04:08 PM
03/06/16 04:08 PM
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New York
rarefish Offline OP
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I have read where the spline count is different between the two. I'm wondering if that is also away to ID them.

Re: 727 or 904 converter? [Re: rarefish] #2025806
03/06/16 04:31 PM
03/06/16 04:31 PM
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Upper Marlboro, MD
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Reggie Offline
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The 727 converter snout is 1.875" in diameter and the 904 converter snout is 1.5".

Re: 727 or 904 converter? [Re: rarefish] #2025809
03/06/16 04:35 PM
03/06/16 04:35 PM
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Lakewood, Colorado
herkamer Offline
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Diameters and spline count in this thread:

http://www.forabodiesonly.com/mopar/showthread.php?t=332348


Matt
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Re: 727 or 904 converter? [Re: rarefish] #2025934
03/06/16 07:27 PM
03/06/16 07:27 PM
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New York
rarefish Offline OP
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Using the snout diameter method. I find that it is 1.875" dia. What I have is a 727 conveter and I was thinking that it was a 904 one.
Thanks...

Re: 727 or 904 converter? [Re: rarefish] #2025941
03/06/16 07:35 PM
03/06/16 07:35 PM
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Rio Linda, CA
John_Kunkel Offline
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Rio Linda, CA

If you don't have anything to measure with, count the ring gear teeth...727 has 130, 904 has 122. (except for the '60-'61)


I'm supposed to respect my elders, but its getting harder and harder for me to find one now.
Re: 727 or 904 converter? [Re: rarefish] #2034394
03/19/16 11:07 AM
03/19/16 11:07 AM
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New York
rarefish Offline OP
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I have rechecked all of the measurements on my unknown converter and everything is pointing to a 727 converter. 130 teeth, 1.875" snout etc. but when counting the splines inside. I see that there are two sets of them. I get 27 splines on the top set and 24 splines on the bottom or inner set.

http://www.forabodiesonly.com/mopar/showthread.php?t=332348

I see on the above link that the spline count for the 1967 and later 727 have 24 splines so counting the inner set gives me that.
Does that sound right as the inner set being the one to count?

Re: 727 or 904 converter? [Re: rarefish] #2034598
03/19/16 05:20 PM
03/19/16 05:20 PM
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Rio Linda, CA
John_Kunkel Offline
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Yes, the outer splines (reaction shaft) were the same from day one to the end of production...only the input shaft (inner) splines changed over the years


I'm supposed to respect my elders, but its getting harder and harder for me to find one now.
Re: 727 or 904 converter? [Re: rarefish] #2034624
03/19/16 05:58 PM
03/19/16 05:58 PM
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New York
rarefish Offline OP
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Thanks, John. I knew that you would come through on this....







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