88 to 91 FXST conversion
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Stage III
Joined: Apr 2011
Posts: 3
Likes: 0
From: Houston, Texas
88 to 91 FXST conversion
I am considering installing a 91 tannie in my 88 softail, and I don't know if it will work. I have to buy the parts to test this. Everyone tells me I can't do it but can't say why. I don't want to change my inner primary, starter, etc. but hear me out. Of course I have to include the splined clutch assembly, I've checked my (88) trannie shaft (external bearing surface) to be 1.27ish going through the primary bearing/seal, the 91 trannie guys tell me theirs is 1.265 which tells me we are likely measureing the same shaft diameter, both clutch assemblies are 66 tooth, if they are the same overall dimensions (starter lines up??), why can't I install a 91 trannie and clutch in my 88 primary and frame?
Anybody tried this or has better knowledge?
Anybody tried this or has better knowledge?
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
Likes: 22,718
From: Farmington ,MS
I am considering installing a 91 tannie in my 88 softail, and I don't know if it will work. I have to buy the parts to test this. Everyone tells me I can't do it but can't say why. I don't want to change my inner primary, starter, etc. but hear me out. Of course I have to include the splined clutch assembly, I've checked my (88) trannie shaft (external bearing surface) to be 1.27ish going through the primary bearing/seal, the 91 trannie guys tell me theirs is 1.265 which tells me we are likely measureing the same shaft diameter, both clutch assemblies are 66 tooth, if they are the same overall dimensions (starter lines up??), why can't I install a 91 trannie and clutch in my 88 primary and frame?
Anybody tried this or has better knowledge?
Anybody tried this or has better knowledge?
http://cgi.ebay.com/ebaymotors/Chrom...Q5fAccessories
Last edited by Tom84FXST; Apr 7, 2011 at 06:14 PM.
Thread Starter
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Stage III
Joined: Apr 2011
Posts: 3
Likes: 0
From: Houston, Texas
91 trannie guts into 88 trannie case
OK, it's a long shot but does anyone know if the 91 guts (gears, shifters) will go into the 88 case? In case you didn't read the other stuff, yes I know the shaft is splined and the other stuff, got that covered, just didn't want to change the hole primary if it's not necessary.
Thanks for any advice!
Thanks for any advice!
Tourer
Joined: Jun 2011
Posts: 305
Likes: 0
From: NH
I have an 88 softail. Is your ultimate goal to replace the tyranny or to get rid of your tapered mainshafr with that ridiculous keyway putting your power to the ground? I spun off 2 of those keyways after going a little bigger on the motor and a wrench friend was able to upgrade me to the later style splines mainshaft/clutch setup. If that is your goal,it can be done.
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