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Author
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Topic: Will a small block toploader work for big block?
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chatas
Journeyman Posts: 17
From: Ferndale, MI
Registered: Aug 2000
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posted 07-29-2001 02:06 PM
   
I have a 390 and want to switch over from a C-6 trans to a toploader. I heard that a small block toploader will work and actually they came out of the factory with this setup. Is any of this true? Do I have to use a special pilot bushing? Are the tailshafts any different?Thanks,
Jim
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ccode67
Gearhead Posts: 955
From: douglasville,ga,usa
Registered: Mar 2001
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posted 07-29-2001 03:14 PM
I do remember seeing a pilot bushing for this swap years ago, it was a good bit thicker than a normal big block bushing, maybe to make up for a shorter input shaft????
------------------
Stuart MCA #48902
67 stang 5 speed
91 f-150 xlt
98 explorer xlt sohc v-6
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Gary
Gearhead Posts: 702
From: Sarasota, Fla. USA
Registered: Jun 99
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posted 07-29-2001 05:35 PM
My old 69 Mustang with 390 had the small imput shaft toploader. I spent years beating on it before it finally gave up. All in all they are great trannys. Id look for a big spline toploader from a Torino or R code Mustang if you can find one cheap enough. You can get the pilot bearing fairly easy or just call 4speedtoploaders.com for all your wants and needs.. Tailshafts.humm? I think the big spline from the Mustang is abit shorter if I rememeber but no big deal.
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chatas
Journeyman Posts: 17
From: Ferndale, MI
Registered: Aug 2000
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posted 07-30-2001 07:51 AM
Thanks for the replies!
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Ryan Wilke
Gearhead Posts: 733
From: Stanton, Michigan
Registered: Oct 2000
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posted 07-30-2001 08:46 AM
Jim,
The small-spline Toploader was OEM behind the 390. Only the 427, 428, 429 were OEM-equipped with the big-spline Toploader. I would use the small-spline unit behind a big-block as long as I didn't bolt on any slicks. If slicks are in your future, then I'd get nervous about the small-spline unit. --just my two cents worth. Good Luck!
Ryan 
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