metric 200r4?

[gitrunindady]

Whats the difference between a metric 200r and a 'non' metric? ive come across a couple for dirt cheap. sounds too good to be true....thanks yall.
HOOK 'EM baby!
g.t.

 

[dvalentine]

THM200 - Light duty, "metric" 3 speed transmission
THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. This is a 4 speed, overdrive unit.

Val