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Username Post: 2001 blazer 4l60e/codes po741,po751        (Topic#346766)
Forum Newbie
Posts: 2

Age: 43
Loc: Virginia Beach Virginia
Reg: 08-22-17
08-23-17 12:32 AM - Post#2705282    

OK, this is the 3rd transmission I've put in this blazer since November 2016. I just had the transmission put back in last week. Was driving, shifting fine until 2 days ago, was doing 60 on the interstate, running 2000 rpms when outta nowhere it jumped to 4000 rpms. Since the new motor doesn't have 50,000 miles on it yet I decided it'll be cheaper to pull over instead of blowing it up after 3 transmission later, I'm over this I had it towed home, called the mechanic who rebuilt and reinstalled it . he was to busy to come over and have a look at it. So here I am, I put a computer on it an it came back 2 codes,po741,po751. Never messed with a transmission before, but after watching hours upon hours of YouTube video I believe I can attempt to fix the problem. Question is, it's drivable but seems to have no 1st gear and only shifts once,transmission fluid fluid and filter are on only a week old, hard to believe all the shift solenoids went at once,I installed a new neutral safety switch already, what course of action would you recommend. I've done spent 3800 on 3 transmission so I'm really not trying to get another one. Thanks in advance for the help

Frequent Contributor
Posts: 1340

Loc: Lake George, NY
Reg: 11-11-15
08-23-17 07:53 AM - Post#2705295    
    In response to ptracy74

You paid this guy for a trans job and your stuck trying to fix it!?

Senior Chevytalk Moderator
Posts: 24365
Loc: Austin, TX 78748
Reg: 05-09-00
08-25-17 06:22 AM - Post#2705531    
    In response to Shepherd

Welcome to the site. I've seen plenty of rebuilt transmissions fail because solenoids are reused. On my rebuilds, I ask for new solenoids plus upgraded parts per application. Check the main connection harness. If it's loose, all kinds of problems will appear.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles

Forum Newbie
Posts: 2

Age: 43
Loc: Virginia Beach Virginia
Reg: 08-22-17
08-26-17 06:17 PM - Post#2705701    
    In response to gchemist

I dropped the pan and found all kinds of trash, I changed the shift solenoids and the TCC valve refill the transmission with new fluids and it only shifts once I guess I'm taking it to a a transmission shop instead of having a backyard mechanic do it. Tried to upload pic's of the pan, but it won't let me.

"3rd Year" Silver Supporting Member
Posts: 459
Loc: Western NY
Reg: 06-15-02
08-26-17 08:48 PM - Post#2705721    
    In response to ptracy74

I'm having a different transmission issue with a different type of trans but I happened to come across this youtube video today on replacing the 4L60E valve body and he spoke about some common codes being thrown with one particular issue. I don't recall if they were the same ones you listed but when I saw the video I thought of your post and though it might be a helpful one to watch:

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