i have a 92 blazer its a automatic thats all i know about tranny other then its original and vin code is a w anyway wanted to know is it a 3 speed with od or 4 w/od and if u can tell me at what mph it should b shifting into each gear thanx

 

We need to know more about your truck. The trans will be either a 700r4 or the 4L60. Both are 4speed autos. As for the rpm/speed for each gear shift, that would depend on tires and gears. You'd need to find your RPO code list and decode it (run a search) to find the gear ratio of your axle(s) and the sticker on the door should tell you the stock tire size your truck came equiped with. Also, the speed at each shift depends on the throttle position. Full throttle would be the best way to tell if it's shifting properly.

What are you experiencing that is making you ask these questions?