915.0Notch

WHY WOULD MY 91 LX NOTCH 5.0 HAVE A BORG WARNER T5 INSTEAD OF A TREMEC T5?

gspfunk

It's the same thing. TTC (Tremec) bought Borg Werner.

anthonydalrymple

gspfunk is correct. Origional factory T5's pulled from a Mustang will have "Borg Warner" script on it. Aftermarket or Ford replacement T5's (including T5Z's) will have "Tremec" script on it.

915.0Notch

OK THAT MAKES SENSE, BUT IT'S ALSO NOT A WORLD CLASS IS THIS CORRECT ALSO??

Twister

you have a "World Class" T5. They started using the "World Class" T5 durring the 1985 production year.

In 1985, the T5 was upgraded to the "World Class" T5 - improvements include:
tapered roller bearings on the countershaft
caged needle bearings under 1st, 2nd, and 3rd gears on the mainshaft
double synchronizers on 1st and 2nd
steel blocker rings with friction linings on 3rd and 4th
torque capacity remains at 265 lbs-ft because of the new 1st gear ratio being 3.35 vs the 1983 1/2 - 1984's 2.95

In 1990, the T5 was upgraded again with the following improvements:
4615 alloy steel for the cluster & 3rd gear
4620 alloy steel for 2nd gear
a coarser pitch was used on 2nd and 3rd improving strength
these upgrades upped the torque capacity to 300 lbs-ft despite the 3.35 1st gear

Torque rating (strength) of a tranny is based on:
1st gear ratio
mainshaft - to - countershaft-centerline distance (T5: 77mm)
width of gears

anthonydalrymple

If my memory serves you should have a metal tag on the trans(mounted near where the bellhousing bolts to the trans) That starts with FOZR 7003 XXXX or FZZR 7003 XXXX

915.0Notch

OK THANX GUYS FOR ALL THE INFO!