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TH400 low sprag

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Old Mar 20, 2007 | 11:31 PM
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Default TH400 low sprag

Is there anything to be said about using a low sprag instead of a low roller in a th400?
I have the low sprag in my nova, but was wondering why they only used it in '64-'65.
The gearset has been rebuilt before the trans was built.
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Old Mar 21, 2007 | 11:32 AM
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Anyone know what I'm talking about?
Is a LOW sprag better than a low roller?
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Old Mar 21, 2007 | 05:09 PM
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Old Mar 21, 2007 | 09:53 PM
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Even when they went to a roller assembly, this was never a weak point. Run what you have.
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Old Mar 21, 2007 | 10:44 PM
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Thanks.
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Old Mar 22, 2007 | 06:37 AM
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I would have to agree with Dayna on this one. To be honest with you I never heard of a low sprag in this application until you posted. Thanks for the history lesson. Vince
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Old Mar 22, 2007 | 06:53 AM
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I can post pics of a spare sprag on the center support but the only gearset I have that uses a sprag is in the car. It's smooth on the inside instead of ramped.
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Old Mar 22, 2007 | 07:10 AM
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That's cool. I have a pretty good idea of what it looks like. I just have never built one with it. Maybe you should sell those parts on eBay for some coin!
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Old Mar 22, 2007 | 07:12 PM
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Maybe you should sell those parts on eBay for some coin!
I could have, I got a bunch of stuff from an old hardparts supplier. He had xx of hours to empty the old shop, they were taking big u haul trucks full of parts 1/2 mile down the road to the scrap metal place, getting $3000+ a truck (according to him).
He let me take a good chunk of stuff, for some reason there were th400 parts covering the floor of a 1500 sq ft room, all lined up, no cases to be seen. I ended up with some new pumps, new 4L80E direct drums and old sprag type too. Also a box of about 100+ new sun gears and sun gear shafts. and some other stuff. I got a bunch of stuff. I only left because I wore myself out carrying it all.
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