Ford Mustang (1999-2004) Service Manual: Index Card
Place an index card or a piece of paper between the weatherstrip and the sealing surface, then close the door. Slowly withdraw the index card or paper after the door is closed and check the amount of pressure on the weatherstrip. There should be a medium amount of resistance as it is withdrawn.
Continue around the entire seal area. If there is little or no resistance, this indicates insufficient contact to form a good seal. At these points, the door, the glass, or the weatherstrip is out of alignment.

Tracing Powder
Tracing powder is used to check both the uniformity of contact and the
tension of a seal against its
sealing surface. These tests are usually done when a suspected air leak/noise
appears to originat ...
Noise, Vibration and Harshness (NVH) (Diagnosis and Testing)
Special Tool(s)
ChassisEAR
107-R2102 or equivalent
Electronic Vibration Analyzer
100-F027 (014-00344) or
equivalent
EngineEAR
107-R2100 or equivalent
...
Other materials:
Manual Transmission
The TR3650 five-speed manual transmission features the following:
The fifth speed gear functions as an overdrive gear.
The forward gears are synchronized and helical cut.
The reverse gear operates through a constant-mesh, fully
synchronized system.
...
Transmission Drive Cycle Test
NOTE: Always drive the vehicle in a safe manner according to driving
conditions and obey all traffic
laws.
NOTE: The Transmission Drive Cycle Test must be followed exactly.
Malfunctions must occur four
times consecutively for shift error DTC code to be set, ...
Striker Adjustment
NOTE: After adjusting the door latch striker plate, verify that the
door can be closed easily and fits
tightly.
1. Loosen the door latch striker plate bolts.
2. Reposition the door latch striker plate from side to side or up and down
as necessary.
...
