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FrontEngineDragsters.Org Forum
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Dan Dishon's Transmission Den
(Moderator:
GlennLever
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Chevy SM420 manual box
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Topic: Chevy SM420 manual box (Read 3485 times)
Ponti
Guest
Chevy SM420 manual box
«
on:
March 27, 2016, 01:25:31 PM »
Has anyone ever used one of these in a slingshot?
ratios are
1st 2nd 3rd 4th Reverse
7.05 : 1 3.57 : 1 1.70 : 1 1.00 : 1 6.78 : 1
Wondering about using just 3rd and 4th.
Any thoughts?
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bikeguy307
Full Member
Posts: 241
Re: Chevy SM420 manual box
«
Reply #1 on:
March 28, 2016, 05:23:47 AM »
Those are some interesting ratio's. 3rd and 4th are close to some of the glides I have built for my higher HP customers 1.69 and 1.00. Would be interesting if you could remove 1st and 2nd to make it a true 2 speed box.
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Ponti
Guest
Re: Chevy SM420 manual box
«
Reply #2 on:
March 29, 2016, 08:36:08 AM »
I'm just toying with idea's. Will have to look to see how gears are set in the box.
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ricardo1967
Hero Member
Posts: 570
Your Best Time: No full pass yet.
Your Engine: Alky SBC 400
Your Track: Brown County Dragway (Bean Blossom, IN)
Your Vehicle: 173" FED
Re: Chevy SM420 manual box
«
Reply #3 on:
March 29, 2016, 02:23:20 PM »
I like the idea, but I think you're considering what when comparing gear ratios between manual and automatics transmissions, the torque converter provides additional reduction.
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FrontEngineDragsters.Org Forum
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Technical
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Dan Dishon's Transmission Den
(Moderator:
GlennLever
) »
Chevy SM420 manual box