I am swapping my tranny for a Heavy Duty unit. In my reasearch I have found that may weak, standard 4T60E had a K factor of 122. My new Heavy Duty 4T60E will have a torque convertor K factor of 163. What does this mean? Will it be better for acceleration? thanks.

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Purple 1988 GT
Supercharged 3800 Series II V6
Mods: 3.00 pulley
1.9 High Ratio Rockers
Custom PCM by Darth Fiero

Best 60'FT- 1.773
Best 1/8th- 8.102
Best ET -12.74@105mph
www.cardomain.com/memberpage/444061

Here's a link to a site that discusses K-factor.

http://www.theherd.com/articles/torque.html

It will increase your stall speed about 300-400 rpm. It will also affect the shift points and you'll likely need a re-burn on the chip to prevent it from over-revving or hitting the limiter.

GM Torque Converter I.D.

The 245 mm dia torque converter I.D. code works the same way as the 298 mm converters, but with different meanings.



The first digit of a 245 mm converter refers to the application.

F = Front wheel drive
H = Rear wheel drive (except THM 180's)
S = THM 180

The second digit is the "K" factor. The chart shows the "K" factor for each code along with the stall speed. Note: Multiply the "K" factor by 11.6438 to get the stall speed of a 245 mm torque converter.

CODE K FACTOR STALL SPEED
A 240 2795
B 220 2560
C 205 2385
D 180 2095
E 160 1860
F 148 1720
G 140 1630
H 130 1514
J 177 2061
K 237 2760
L 163 1897
M 131 1525
N 218 2538
Y 122 1420
Z 203 2363

The third digit refers to the clutch type.

CODE DAMPER TYPE
0 No converter clutch
1 12O ft/lb
2 104 ft/lb
3 170 ft/lb
4 215 ft/lb Heavy Duty
5 215 ft/lb *RTC
6 170 ft/lb Heavy Duty
7 215 ft/lb *RTC Heavy Duty
8 Viscous Clutch
9 240 ft/lb
A 215 ft/lb
B 215 ft/lb *RTC

* RTC = Reverse Torque Control (poppet valve)

The fourth digit (optional) refers to the type of cover used.

CODE COVER TYPE (APPLICATION)
A FWD 208.2 mm Bolt Circle
B FWD 237.0 mm Bolt Circle
C FWD 237.0 mm Bolt Circle (viscous Clutch)
D RWD 247.65 mm Bolt Circle
E RWD 237.0 mm Bolt Circle, No Converter Clutch *
F RWD 237.0 mm Bolt Circle *
G RWD 247.65 mm Bolt Circle *
H RWD 247.65 mm Bolt Circle, No Converter Clutch *
K RWD 237.0 mm Bolt Circle, No Converter Clutch *
P THM 180 ISUZU
R THM 180 Opel
S THM 180 BMW

* 180 degree weld on each lug

Look at the code on the torque converter in figure 6. You can easily identify it as a front wheel drive model. (The first code is an "F"). The stall speed is 2760 (the second code is a "K"), and it has a damper assembly rated at 120 ft/lb's (the third code is a "1".) Notice that the fourth code has been omitted.

Thanks for the info guys, it really helps alot!