T5Z Breaking point.... - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 11-28-2018, 04:36 PM Thread Starter
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T5Z Breaking point....

I am converting my 347 68 Cougar to a 5speed and chose the T5Z due to ease, trans tunnel mods, weight and a bunch of other little reasons.
My question is what breaks the T5Z. Is it always 3rd gear, if I don't dump the clutch at 4k will it live? Is it when the car hooks that they break?
What has been your experience?
I had one previously in my 83 gt and in my 64 falcon, no problems running mid to low 11's in both cars....but this car is heavier and has way more power
(347, 11R heads, 10.75 compression, FTI custom cam for this build (6500 redline)
Vehicle weight 2820
3.80 gear 28" tall tire (radial)

-Mav


All hail the almighty B cam! From 175 HP 1985 5.0HO to 1200 HP Turbo cars..........Completely universal, any combo, any goal! B cam or be Slow!



408 internal balance, H beam rods, probe -22cc pistons AFR205's, super victor, custom XFI based stroker cam, 248/258 on a 111 LC. 1.75 hooker super comps, 4.00 gear 9" 4500 converter. 4 wheel power disk brake stock looking 66 mustang weighing in at 2985 with driver!!
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post #2 of 7 Old 11-28-2018, 04:49 PM
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In my old drag car I blew 3rd gear apart twice running mid 11s at 2820#. These were just stock used units I was finding locally and trowing in the car. No clue on miles or anything before I put them in. They were cheap and plentiful in the early 2000s.


90 LX Notch 5.0 5spd, bolt on drag car with some giggle gas.
11.71 @ 116mph
86 Gt T-top 5.0 5spd, That one day project.
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post #3 of 7 Old 11-28-2018, 06:05 PM
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If a car on drag tires. The mainshaft on launch. New mainshaft and tailhousing to repair. Down track, 3rd gear. New 3rd and countershaft to repair. After many accumulated runs the main case between the 2 aft bearing bores have a tendency to crack between bores. New case, counter shaft and whatever gear it was in at failure. Minimums for repair.I had better luck with older Borg-Warners T-5's than the newer Tremecs made in Mexico. Slip at the tire or the clutch is always a good thing. ET or longevity.
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post #4 of 7 Old 11-28-2018, 06:48 PM
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Did you buy a t5 z spec new?

You can get an Astro a5 or promotion worked-over t5 for almost the same price...

Some people are able to run big power behind a z spec, some aren’t so lucky.

Astro, promotion, or g force are the only way to go for higher hp builds imo.

I run an a5, it’s a stout trans and shifts like a stock t5.

1996 Mustang
347, 205 11R's, Box R Intake, Ported lower, custom comp cam, 42lb injectors, 255LPH, pro-m 80, 75mm Cheap-ass TB, 1 3/4 x 3in LT's, exhaust by me, A5 trans, 4.10

422WHP/456Ft/lb. Tuned using QH by Tony @ Tuners Inc.
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post #5 of 7 Old 11-28-2018, 07:08 PM Thread Starter
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Originally Posted by 96pushrod View Post
Did you buy a t5 z spec new?

You can get an Astro a5 or promotion worked-over t5 for almost the same price...

Some people are able to run big power behind a z spec, some arenít so lucky.

Astro, promotion, or g force are the only way to go for higher hp builds imo.

I run an a5, itís a stout trans and shifts like a stock t5.
Yes I ordered it today from Modern Driveline. It was way cheaper than the astro and gforce that I saw.
From Modern it was $1895 free shipping and tax free through christmas. So I ordered it.

All hail the almighty B cam! From 175 HP 1985 5.0HO to 1200 HP Turbo cars..........Completely universal, any combo, any goal! B cam or be Slow!



408 internal balance, H beam rods, probe -22cc pistons AFR205's, super victor, custom XFI based stroker cam, 248/258 on a 111 LC. 1.75 hooker super comps, 4.00 gear 9" 4500 converter. 4 wheel power disk brake stock looking 66 mustang weighing in at 2985 with driver!!
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post #6 of 7 Old 11-28-2018, 07:21 PM
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Ok gotcha. Pro motion are probably the cheapest I’ve seen with built t5s. They start at around $2100 for a 500-600 horse unit. When I talked to Walt he mentioned that was whp, which I thought was interesting.

http://promotionpowertrain.com/TRANSMISSIONS_.html

1996 Mustang
347, 205 11R's, Box R Intake, Ported lower, custom comp cam, 42lb injectors, 255LPH, pro-m 80, 75mm Cheap-ass TB, 1 3/4 x 3in LT's, exhaust by me, A5 trans, 4.10

422WHP/456Ft/lb. Tuned using QH by Tony @ Tuners Inc.
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post #7 of 7 Old 11-28-2018, 07:22 PM
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In my experience with T5s and T5z specs, 3rd has been the issue. I didn't have many issues with stock or stock like clutches and power. Add in an aggressive aftermarket clutch, sticky tires, more power and especially a powershift or two and you have a recipe for failure.

Stuff...
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