tranny modulator


  #1  
Old 04-20-02, 10:45 AM
texasram
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tranny modulator

I have a 91 chevy sportside with a 350 engine. the tranny is a 5 speed w/OD automatic. I don't know what type exactly. I want to know what does the transmission modulator do and how do you know its time to replace.
 
  #2  
Old 04-20-02, 12:51 PM
Billdo49er
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It modulates the shift.
If vehicle is not shifting when it's supposed to then it may be time to check it out.Not just relace it.
 
  #3  
Old 04-20-02, 02:12 PM
Joe_F
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As I recall, this is a 700R4 transmission, which is a 4 speed overdrive. It doesn't use a modulator. There is no 5 speed automatic in this vintage truck

The TV (throttle valve) cable adjustment is critical for good shifting. If it's off, the transmission becomes lunch in a heartbeat.

See the links/posts in my signature file for some information on adjustments.

Only a THM400 would use a modulator, and that is not the transmission in your truck.
 

Last edited by Joe_F; 04-20-02 at 05:03 PM.
  #4  
Old 04-20-02, 04:17 PM
Billdo49er
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Good call Joe.I didn't notice the o/d part of his post.
 
 

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