When I did the T5 swap in my '80 16VT, I started out with a 1330 U-joint yoke driveshaft that came with my transmission (SN95 V6), and it definitely made contact with the body under load with a stock Mustang style rubber transmission mount - but was fine under daily/street conditions. A 1310 was fine in it, as well as on the similarly-placed TKO on my '93 LSx car.
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