CLASS RACER FORUM - View Single Post - GM 700-R4 questions.....

ss wannabee · 08-08-2010, 08:20 PM

Thanks for all the responses...Unfortunately, work and family issues took up most of my spare time this weekend and had little time to investigate. I DID manage to get a hold of a GM service manual for the vehicle...and it has diagnostic troubleshooting charts which
mentioned most of the stuff you've said. Looks like I can electrically test the solenoid and
brake switch through the ALDL connector with a test light...and I'll do so. BTW, the Blazer
doesn't have antilock brakes...I think they came a year or two later. The trans fluid seems ok in color and smell on the stick...What I might do is just CHANGE the solenoid anyway along with the filter and fluid. I bought the piece some months ago...but I'll check the resistance Rob..just to see...I saw that the GM manual says the sol. is "junk" if it measures LESS than 20 ohms,,,,maybe the working "spec" is 20-30 ohms? Alan...you mentioned a "stacked shift" situation...YES this vehicle has done that...ALSO intermittently for the last 10 years or so....sometimes loading up the vehicle so badly that I'm forced to downshift. That's one reason why I'm leaning towards solenoid replacement. The Blazer is driven in the overdrive position..it works fine...no need for manual shift.

08-08-2010, 08:20 PM	#9
ss wannabee Senior Member Join Date: Jun 2005 Posts: 663 Likes: 0 Liked 7 Times in 7 Posts	Re: GM 700-R4 questions....are Thanks for all the responses...Unfortunately, work and family issues took up most of my spare time this weekend and had little time to investigate. I DID manage to get a hold of a GM service manual for the vehicle...and it has diagnostic troubleshooting charts which mentioned most of the stuff you've said. Looks like I can electrically test the solenoid and brake switch through the ALDL connector with a test light...and I'll do so. BTW, the Blazer doesn't have antilock brakes...I think they came a year or two later. The trans fluid seems ok in color and smell on the stick...What I might do is just CHANGE the solenoid anyway along with the filter and fluid. I bought the piece some months ago...but I'll check the resistance Rob..just to see...I saw that the GM manual says the sol. is "junk" if it measures LESS than 20 ohms,,,,maybe the working "spec" is 20-30 ohms? Alan...you mentioned a "stacked shift" situation...YES this vehicle has done that...ALSO intermittently for the last 10 years or so....sometimes loading up the vehicle so badly that I'm forced to downshift. That's one reason why I'm leaning towards solenoid replacement. The Blazer is driven in the overdrive position..it works fine...no need for manual shift.