4 Cylinder WC T5 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 9 Old 04-13-2019, 10:45 PM Thread Starter
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4 Cylinder WC T5

What are the differences between this transmission and the 8 cylinder WC T5? Besides the output shaft diameter and the ridiculously high gears. Thanks

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post #2 of 9 Old 04-15-2019, 01:16 AM Thread Starter
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Anyone know the differences between these two transmissions?

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post #3 of 9 Old 04-15-2019, 07:56 AM
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Only rated for 240 lb-ft for one.
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post #4 of 9 Old 04-15-2019, 09:05 AM
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The main gearset is different. Countergear, input shaft, and 1st, 2nd and 3rd gear. All the synchro's and other parts are the same. 5th gear is the same.


My current T-5 is a former 4 cyl T-5 that i installed a 90-93 V8 gearset in. All i changed was the above parts, or worn parts. Been beating the snot out of it for 10 years without issue.

Mike
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post #5 of 9 Old 04-22-2019, 04:07 PM
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Also the input shaft has a smaller pilot.

They are very weak. Breakable with a turbo 2.3. Speaking from experience.....

WTT my '92 GT for a nice clean '91-'93 2.3/T5 hatch or coupe.
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post #6 of 9 Old 04-22-2019, 04:48 PM
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What gets me is the 2.3 was rated at 90hp and 123lb-ft with aT5 rated for 240 lb-ft, while the 5.0 was rated at 225hp and 300lb-ft with a T5 rated for 300lb-ft. To have the same margin of over rating, the V8 T5 would have to have been rated at 590ish lb-ft. It would have made the T5 basically a TKO 500. If only the wrecking yards were littered with 550+ lb-ft rated T5's.
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post #7 of 9 Old 04-23-2019, 08:20 AM
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If only they were littered with anything fox body.

14 yards nearby, not a single fox.

Also, the 8 plug 2.3's had I think 112hp and a little more torque. Keep in mind that same basic T5 (240 lb-ft rating) was used behind the turbocoupes and turbo cougars; which had around 200hp and I think around 240 lb-ft-again-right at the upper end of borg-warner's torque rating. SVO's (85.5 and 86 only) had slightly more power but they also used a slightly different T5 (3.50 first gear). 84-85 SVO's had a 4.03 first gear (which SUCKED). I had one and put a 3.97 box in it which was better but still mismatched to the turbo engine's power curve.

My '93 has a SVO engine in it but with mods, and with a 3.97 first gear, traction is nonexistent. First and second gear. I need a 94-97 V6 transmission to put in it.

WTT my '92 GT for a nice clean '91-'93 2.3/T5 hatch or coupe.
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post #8 of 9 Old 04-23-2019, 04:20 PM
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Quote:
Originally Posted by tjm73 View Post
What gets me is the 2.3 was rated at 90hp and 123lb-ft with aT5 rated for 240 lb-ft, while the 5.0 was rated at 225hp and 300lb-ft with a T5 rated for 300lb-ft.
It's the actual gear ratio's themselves that dictate the strength, at least up to 1990 when I believe there was a material change. Up to 1990, the V8 T5 was actually rated at 265/275 tq. They didn't get 300 until 1990 with a slight gearing and material change. But if you took, say, a 1988 4cyl and v8 T-5, the internals of the trans are exactly the same except the gear ratios are different. Since the 4cy gearing is shorter, you get a bit more mechanical advantage with the gearing which is why the rating is lower.

I believe the 93-95 Cobra T5 gained 10 ft-lbs of torque rating simple by the addition of the pocket bearing design that helped reduce mainshaft spread. Of course, this is speculation, so don't quote me on that when this comes up in an internet search. Typically 3rd gear tends to be problematic because it's the furthest gear from any sort of bearing support. Under load, gears tend to want to spread and 3rd has the ability to move away from each other slightly. As gears spread, the teeth, where they contact, become thinner, and the risk of shear goes up. One way to improve T5 life it so stiffen up the mainshaft supports a bit. This might be a stronger case, a stronger mainshaft (which astro sells) or even the cobra pocket bearing mod.

Of course, 1st gear also has it's own problems with shearing the teeth off the input shaft/1st with a hard launch. But, this is gearing specific. If you had some crazy gear ratio of 16:1 for 1st, you could probably shear the teeth off with a stock 4cyl with a good clutch drop on sticky tires. The Z-spec's 2.95 1st gear is probably a good reason to the increased torque rating of that specific trans.

Disclaimer, i'm not a transmission expert, just someone who's rebuilt a few dozen or so on his own workbench. Take this all with a grain of salt

Mike
--1988 Mustang LX 5.0--
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post #9 of 9 Old 04-23-2019, 05:07 PM
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The spreading of the shafts is going to be a function of the stiffness of the steel used in them, not the strength of the steel. The stiffness of the steel is a function of the modulus of elasticity of the steel. This is almost a constant for all steels. Unless a steel aftermarket mainshaft has different geometry (thicker, for more bending stiffness) it can't reduce gear failure from shaft spreading.

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