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For the '86 TC guys. I replaced my driveshaft with an aluminum ds from a '94 Crown Vic. The CV aluminum driveshaft was cut down and balanced for the TC. Since the Crown Vic uses the larger 1330 u-joints I decided to replace both the tranny yoke and diff. yoke with 1330 units. The tranny yoke I bought new, about $70.00. The diff yoke I got from the Crown Vic along with the companion flange from same. I measured (and measured) the '86 TC driveshaft at 48 7/16" (contrary to many other posts I read). The Crown Vic companion flange and yoke is .115 longer than the TC flange and yoke. (All measurements are from u-joint centerlines.) I had the drive shaft cut to 48 3/8, sort of as a compromise.
While at it I replaced the differential pinion seal since I had to remove the companion flange. Then I got my surprise. The companion flange from the Crown Vic is for an 8.8 rear and the '86 TC is a 7.5. The Crown Vic pinion shaft is larger (I hope it's the same as the 8.8 rear I have in the garage) and does not fit the pinion shaft on the 7.5. So I got a 1310-1330 conversion u-joint and reinstalled the 7.5 flange and yoke.
It solved my vibration problem. I hope the Crown Vic companion flange will fit the 88 TC 8.8 rear I have in the garage and plan to install under the '86.
I also discovered the larger Crown Vic companion flange will not clear the weights on the pinion housing, so that got removed and was not reinstalled when I went back to the 7.5 flange.
Now that the vibration is gone I can hear a rumble from the rear end. I tried my best to get the pinion pre-load the same but maybe I messed that up, causing the rumble. Anyway, I'll ignore it until the 8.8 goes in.
While at it I replaced the differential pinion seal since I had to remove the companion flange. Then I got my surprise. The companion flange from the Crown Vic is for an 8.8 rear and the '86 TC is a 7.5. The Crown Vic pinion shaft is larger (I hope it's the same as the 8.8 rear I have in the garage) and does not fit the pinion shaft on the 7.5. So I got a 1310-1330 conversion u-joint and reinstalled the 7.5 flange and yoke.
It solved my vibration problem. I hope the Crown Vic companion flange will fit the 88 TC 8.8 rear I have in the garage and plan to install under the '86.
I also discovered the larger Crown Vic companion flange will not clear the weights on the pinion housing, so that got removed and was not reinstalled when I went back to the 7.5 flange.
Now that the vibration is gone I can hear a rumble from the rear end. I tried my best to get the pinion pre-load the same but maybe I messed that up, causing the rumble. Anyway, I'll ignore it until the 8.8 goes in.
Robert Camp
'86 Medium Regatta Blue TC, 5-speed, original owner.
'86 Medium Regatta Blue TC, 5-speed, original owner.