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Old 03-24-2010, 05:08 PM
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P1870 - TransGo or Sonnax Kits ???

Ok... I have the dreaded 1870 code with the hard 1-2 shift. Bought it with 126k on orig 4L60E and immediatly had the trans flushed even though the fluid looked fine. Now at 133k and weather in the 70s, I'm getting the hard shifts after longer 70+mph drives. After restarting truck, shifts fine. I want to FIX the problem and get another 70k out of the trans =D not just bandage it for 10k more miles.

Question: should I use the TransGo SK4L60E kit and use their redesigned parts in the worn sleeve or use the Sonnax Kit that reams out the sleeve and replaces it as well?

Thanks,
Robert

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Old 03-24-2010, 08:00 PM
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either kit works well... the Sonnax requires a tool ( reamer) .

the TransGo is plug n play ( so to speak)
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Old 03-24-2010, 08:46 PM
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TransGo is the way I'm leaning but because your just putting a new part in a worn sleeve, I'm unsure of the longevity of the repair. How does the "redesigned" part work? Is it just a larger piece? Is the wear occuring in the factory sleeve or in the factory valve?
Srry for so many questions, I have worked on everything on cars except Trans/rearends. The unknown makes me OVER research. =)

thanks again,

Robert
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Old 03-24-2010, 08:48 PM
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Before going after valvebody, you verified TCC slip only hot? After trans temp reaches approx 150°F.

If TCC slips at low ATF temps, there could be a different issue. But usually its TCC regulator bore. Its good to do it and easy to verify with a scanner Espeacially, if you are charging for diagnostics.
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Old 03-24-2010, 09:20 PM
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I don't have a scanner but, I'm positive on hot ATF. It's done it 3 times and all 3 times, it started to occure after a 30-60min freeway drive. Turned truck off and and after 10-30min rest, ran perfect.
1) if this is the problem, you've had good luck with the TransGo repair lasting?
2) Do you use the whole kit or just the valve?
3) Should I invest in a trans cooler?

Again, thanks for your patience.
Robert
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Old 03-24-2010, 10:41 PM
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Quote:
Originally Posted by bobbyv
I don't have a scanner but, I'm positive on hot ATF. It's done it 3 times and all 3 times, it started to occure after a 30-60min freeway drive. Turned truck off and and after 10-30min rest, ran perfect.
1) if this is the problem, you've had good luck with the TransGo repair lasting?
2) Do you use the whole kit or just the valve?
3) Should I invest in a trans cooler?

Again, thanks for your patience.
Robert
Guess what I was trying to say is. You want to see if the TCC slips when its cold. You can't really rely(in repair business) on just that it takes 30-60 minutes of driving, as it can take a certain drive cycle to set the code. Gotta do it with a scanner. But anyway, enough over complicating it

Just use the Transgo kit, IMO. Not sure about just using the valve. Probably good to at least do the valvebody part and Pressure reg spring and not worry about side servo stuff. Unless you like fighting exhaust and whatever else. Its cheaper than buying the reamer, for one job.
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Old 03-24-2010, 11:12 PM
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at the mileage on the trans ( 133k) , if that is correct, you have wear through out the stator area and that will allow oil to not flow the proper path.

With worn bushings and the valve body bore wear on the PWM circuit the code is often set when hot.

the TransGo kit works very well .

If the converter clutch is still in good shape, the TG kit should fix up the trans on this code
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Old 03-25-2010, 12:25 PM
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Thanks guys. Will order the shift kit.

Robert
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Old 04-04-2010, 03:31 PM
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Installed the new TransGo piston last night and took a 2hr most highway drive today and it works like a new transmission!!! Excellent advice guys. Thanks again.

Robert
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