Christophers 66 Mustang Restoration and Modification
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How to ID a T5

  One of the most difficult issues with a T5 upgrade is finding a used one. People either do not know what they are selling or they try to deceive you. This will help to make sure it is a World Class T5 and not the 4 cylinder NON World Class unit.

   You will then need to verify the T5 shifts smooth and input shaft does not have excessive play.

    It is also recommended you change out the rear bushing and seal. It is also a good idea to change the aluminum bearing retainer to a steel retainer. Here is how to do it: http://www.fordmuscle.com/archives/2000/02/t5/index2.php

 
 

The quick version on T-5s for transplanting into Classic Mustangs (Stan Peace www.Pro-ForcePerformance.com) :

The T-5 first appeared as a 5-speed option in the 83 Mustang.
The 83 and 84 models were the ONLY years the Mustang T-5 was a NON-World Class transmission.

 Beginning with 85 the bearings were redesigned and the World Class version appeared.

85-89 were virtually the same transmission for all of the V-8 models (265 ft/lbs.)

Beginning sometime in 1990 they went to a slightly stronger gear set rated at 300 ft/lbs.

For 94 and 95 the V-8 T-5s were were the same strength as the 90-93, but the input shaft was longer which required the 94/95 type "deeper" bell housing.

The 4-cylinder version of the T-5 is weaker, requires a different pilot bearing, and has a relatively useless first gear, so stay away from those.

 The 94-98 V-6 types use the 85-89 strength V-8 gears, but again, have the longer inpt shaft.

The 99-04 V-6 units use the same gears as the 90-95, but have no provision for a speedometer cable since it is all-electronic.

To ID a T5:

On the top of the T5 there should be a metal tag under a bolt with a number on it.  The number should read 1352-XXX.

Tag Numbers

NWC V8 – 034, 065
3.8 V6 – 220, 236
V8 260lb/ft – 126, 165, 169, 141
V8 300lb/ft – 199, 204, 208, 246, 218, 219
Z-spec 335 – 249, 251
SVO – 200, 202
Cobra – 239, 242, 253

Use the chart with the last 3 numbers to ID the year and specifications:

t-5specsheet.jpg

  The case will have casting numbers that will not give you much information.  It is the internal components that make a T5 World Class (WC).

   WC and NWC both use ATF fluid. It is incorrect that gear lube will be an indicator of a NON World Class (NWC) T5. More info on this and factory manual pages: http://www.allfordmustangs.com/forums/5-0l-talk/204680-tremec-t5-transmission.html

    Check the Input shaft with a V8 pilot bearing. It should fit perfect.  The 4 cylinder NWC input shaft diameter is quite a bit smaller.

    On the driver side, in top middle there should be a Torx bit. If it's a hex bolt, then you've got an older non world class unit.  Here is the location highlighted in a red box

t5a.jpg

The quickest external check whether or not you have a World Class T5 is to look at the counter-shaft bearing cup, just below the bearing retainer. If it is of the roller bearing type, with Timken engravings (left) you have a WC T5.

wcornwc_tp.jpg