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Old 06-08-2017, 08:57 AM   #12
Rob Wright
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Join Date: Feb 2016
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Default Re: 4 speed or 5 speed...That is the question

Quote:
Originally Posted by JMan View Post
I am in the process of ordering a manual transmission for my FS/D-E Challenger.
By rule, I can run a 4 or 5 speed as the OEM 6 speed has two OD gears.
Talking to the Transmission companies, I hear claims that the 5 speed is worth a tenth over the four. I'm not sure I buy into that.
As an engine builder I am constantly hearing parts vendors from oil pumps to piston rings to valve train, all promising their product is worth 12 to 15 HP or better. Although they all are gain, if all the 15HP claims came to fruition, I may be closer to fielding a Top Sportsman car than a Stocker.
I also have to factor in that the extra gear change may make consistency 1 gear more difficult, not to mention the added rotating mass will have some parasitic loss.

Whats can the the stick shift community tell me?

Thanks*
Todd,

Don't rule out the possibility of a tenth faster ET with the 5-speed. I'm thinking about a black COPO that was always a LOT faster than it should have been with a given engine combination.
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