roadrace 5th gear for T-5z? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 05-24-2009, 11:54 PM Thread Starter
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roadrace 5th gear for T-5z?

I am looking for a lower ratio 5th gear for my T5z. I had located one a while back from a company, but it was expensive and required the gear to be pressed on after the cluster was installed in the case.

Just wondering if there are any other options in the .70-.81:1 range. Maybe from another T5 transmission?

The .63 ratio just doesn't work well with a 8:1 2.3L turbo.


1992 5.0 coupe - TTI single turbo
1986 Merkur XR4Ti - 2.3L turbo
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post #2 of 8 Old 05-25-2009, 12:33 PM
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T5 .90 5th gear

Try these guys for T5 5th gears. I like their 0.90 gear for road race.
gforcetransmissions

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post #3 of 8 Old 05-26-2009, 03:22 PM
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why would you put any money into a t-5? Im not trying to be a smartass, but i broke my stock t-5, and then broke a t-5z on the street. Now i have tko-500.
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post #4 of 8 Old 05-26-2009, 04:05 PM Thread Starter
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Quote:
Originally Posted by red ink View Post
why would you put any money into a t-5? Im not trying to be a smartass, but i broke my stock t-5, and then broke a t-5z on the street. Now i have tko-500.
Because I don't need a tremec. The 4cyl T5s hold up fine, I just don't like the ratios, especially the 3.97 1st gear. I have a spare T5z that the input shaft got eaten up a little from a failed pilot bearing in my Mustang. I can have it turned down to the 2.3L pilot bearing diameter and pop it into my XR4Ti without any changes. It's more than strong enough to handle what I need.

The rpm drop when I switch gears puts me out of the powerband and down on boost and an 8:1 2.3L doesn't have much power out of boost. This is the same reason I need to change the 5th gear ratio to use my T5z.

1992 5.0 coupe - TTI single turbo
1986 Merkur XR4Ti - 2.3L turbo
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post #5 of 8 Old 05-31-2009, 02:13 PM
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Talk to Tony at www.astroperformance.com

I was having problems with my T5s eating 5th gear under braking on a bumpy track. Installing the parts below solved the problem, the larger teeth and smaller angle on the gear teeth make a big difference. The cluster support keeps the main shaft and cluster gear from spreading apart. I see no reason to switch to a TKO as the T5 survived last season behind a 580fwhp 383w, the T5 shifts much better than a TKO and is lighter.


.79 Road Race 5th gear.

http://www.astroperformance.com/adva...=.79&x=37&y=22

Cluster support plate.

http://www.astroperformance.com/adva...luster+support
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post #6 of 8 Old 05-31-2009, 10:45 PM
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I run the astro .79 5th in my T5z. A lot more useful on track now. Nice gear, no problems with it.

'87 GT Griggs front, EVM 3-link, Brembo/Baer, GT40 heads and intake, panhard, coilovers, Kirk Racing Roll Bar
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post #7 of 8 Old 06-03-2009, 07:31 PM
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Here's the one I installed on my last T5... works well, get the support plate too...
http://www.5speeds.com/t5/s80.html
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post #8 of 8 Old 06-04-2009, 01:44 PM
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Quote:
Originally Posted by red ink View Post
why would you put any money into a t-5?
Because most Fox guys already have a T5, they're lighter, and they shift better.

-- Robert King
NASA AI #42, Texas
Instructor, NASA Texas Region
Instructor, TWS Perf. Driving School
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