89-99 AWD DSM:
The factory rated the W5M33 89-99 AWD transmission for roughly
250ft.lbs of torque.
put over 700ft.lbs of torque through our top shelf
DSM AWD transmission, these guys
have but we don't expect it to last forever on the OEM
gears. It should be noted that a customers have successfully
put over 600ft.lbs of torque through our transmission for
two seasons of drag racing while another
customer is reporting over 750ft.lbs of torque without
issue but it is expected that fatigue cycle failure will
eventually happen because the factory parts were never
designed to handle this kind of torque.
We have done destructive load cell testing on the DSM AWD
transmission. Listed below are the average peak torque
numbers at which failure occurred immediately during a static load test of a factory new AWD
1st gear =
1000 ft.lbs caused the intermediate shaft to crack teeth on the primary reduction gear.
2nd gear =
1200 ft.lbscaused the intermediate shaft to crack teeth on the primary reduction gear.
3rd gear =
980 ft.lbs caused the teeth on the synchronized 3rd gear.
4th gear =
950 ft.lbs caused the intermediate shaft to crack teeth on the 4th gear.
5th gear =
During the testing the input shaft splines began to yield and crack where the
splines end at
approximately 1100ft.lbs. of torque but it is common to
find them failing when used with clutches that hold above
700ft.lbs. when driven long enough Multi-disc clutch
While the numbers may appear to be impressive, understand
that failure was immediate and that the endurance limit is
approximately 1/3 of
peak torque values listed above.
To put things into perspective a new off the shelf 4th gear &
intermediate shaft from the DSM AWD has an
approximate life of less than 500,000
cycles per tooth @ 450ft.lbs of torque.
The number of cycles can be increased substantially by
detailing & shot peening the gears.
using a clutch that holds around 450ft.lbs of torque
for the daily
driver who street races and occasionally goes to the drag
provide you with the best service life for the gears
because shock loading is kept to 450ft.lbs.
Shockloading a set of gears with excess torque will
severely reduce the number of cycles before the teeth
fail and must be kept to a minimum. Sure you can run
whatever you want but these recommendations should be
adhered to if you're looking for long transmission life.