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Registered
Join Date: May 2007
Location: n.y. upstate
Posts: 191
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Taller 5th gear
Anyone ever install a taller fifth gear for highway driving(80sc, 3.0, heads p/p, 964 cams, new p/s, ssi, 915 trans). Reduce engine noise? Increase milage? Any thoughts?
Thanks Last edited by a320; 05-04-2013 at 05:43 PM.. |
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05-04-2013, 04:32 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,818
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Your question has to many variables....
What transmission do you want to put a taller 5th into? What engine? displacement? What year car? Etc..
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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05-04-2013, 05:36 PM
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Registered
Join Date: May 2007
Location: n.y. upstate
Posts: 191
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Thanks Tim
(80sc, 3.0, heads p/p, 964 cams, new p/s, ssi, 915 trans). Phil Last edited by a320; 05-04-2013 at 05:46 PM.. |
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05-04-2013, 05:39 PM
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Yes, I've done it on a 915 combination, had a 38:29 5th in that. And about to use a 31:41 (G50/50 5th) into a G50/01 for the same reason (much cheaper than an Albins 10:1 CWP, which would be the "best" way to do it - stretches ALL the gears, not just 5th).
It's great for "real" driving; leaves you the lower gears for squirting it (e.g. merging, passing) and then you shift into a tall gear for a relaxed cruise. Seem to remember 80-85 indicated was 2600-2800 RPM on the tach for the 38:29. With a 3.0, you'd have to shift down to accelerate - but you probably would anyway. Yes, you'll likely accelerate slower from the top of 4th (120MPH or so) to maximum speed (probably aero-limited by horse power). I didn't consider that a problem. At one time, I ran a tall 2nd as well as a tall 5th. Gave you 1st for moving around in traffic, 2-3-4 close ratio and a tall 5th for cruise. Works great, if you can pull the 2nd without it being an issue - e.g. due to RPM drop.
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'77 S with '78 930 power and a few other things. |
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05-05-2013, 12:58 PM
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