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Old 07-03-2015, 01:29 PM   #1
1970 C10 MJW
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Transmission problems?

I have my swap done waiting to finish tune. But its driveable . anyways tuner never touched trans shift points but it shift manually fine. But in drive it shifts way too early. Suggestions?
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70 C10 working on a LSx swap
4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol
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Old 07-03-2015, 05:17 PM   #2
68c10airstream
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Re: Transmission problems?

After sending out my pcm and then driving it afterwords the key item to remove is called "torque management". I had a free reburn and used it again to firm up the 1-2 shift and he took it as far as he felt comfortable with it and said i had to have a shift kit installed with a corvette servo, and have the servo pin fit for the trans (i believe there are 3 possible lengths). I sent it to a very good local trans shop for the install of above items and now chirp the tires on 1-2 shift during aggressive driving.

If i was to do any more to the trans software i would move the lock-up engagement point higher, from the stock 37 mph to say 45mph. This is on my 4l65e behind a mild 5.3
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Old 07-03-2015, 06:50 PM   #3
clinebarger
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Re: Transmission problems?

Quote:
Originally Posted by 1970 C10 MJW View Post
I have my swap done waiting to finish tune. But its driveable . anyways tuner never touched trans shift points but it shift manually fine. But in drive it shifts way too early. Suggestions?
Was the correct tire height & Gear ratio flashed into the PCM? Most of the time the shift points have to be changed to get it just right.
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Old 07-03-2015, 09:37 PM   #4
68c10airstream
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Re: Transmission problems?

clinebarger's answer is more to the point. I threw in my 2 cents worth for the sake of details for the software tuning aspects, good luck
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