1-2 shift not happening when supposed to
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From: Freedom Pa
1-2 shift not happening when supposed to
my 94 will not shift properly into second gear at wot. despite lowering the shift points it still goes to around 5500 - 5700 rpm and it acts almost like a rev limiter and bounces back and forth, then I instinctively let off the gas and it shifts to 2nd. The motor is a 383 with a rev kit and fuel shutoff is at 6500. normal mode 1-2 shift point is 31 mph, rear gear is 3.07 with 285 40 17's..... anyone come across this before? btw the trans was rebuilt.
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From: Freedom Pa
that is a possibility, we had the guy who rebuilt also install a billet (sp) servo from ati. i wasnt there when he rebuilt it so anything maybe a possibility, my first instinct was something computer controlled, it being a 4l60e and all
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Originally Posted by racer tony
that is a possibility, we had the guy who rebuilt also install a billet (sp) servo from ati. i wasnt there when he rebuilt it so anything maybe a possibility, my first instinct was something computer controlled, it being a 4l60e and all
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Originally Posted by Pete K
This could be the case. Many things can cause the symptoms described. You can check the servo by pushing firmly on the cover. It should move approx .040-.100. Over 1/8 inch is surely a pin that is too short.
Listen to him he is the MASTER!Thanks,Matt
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From: Freedom Pa
ok tell me if i did this right, since i cannot get my hand onto the servo with the exhaust system in place, i grabbed a small pry bar and gave it a push, the servo moved more than an 1/8th inch or so it seems to my eyes... should i have not used a pry bar or just used barely any force?
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Using a pry bar is ok. The cover pushes a pin. The pin pushes the side of the band. The band clamps the drum. The pin is selective length to make an initial adjustment that "should" be good for the life of the band.
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If it is a recent rebuild, I would politely question him about it. I am not saying you positively found your problem, but you may have. Most trans techs do not check the pin length because it requires a $400 dollar tool to do it. From the factory the correct pin is matched to the case. Most guys believe that if the pin and case stay together, they will be fine after a rebuild. Aftermarket bands can vary in thickness.Combine this with a worn drum, and they can be assembled loose, even after a fresh build.
I check and set each and every one to avoid this possibility. Hopefully, your guy did as well.
I check and set each and every one to avoid this possibility. Hopefully, your guy did as well.
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Originally Posted by racer tony
so since its moving more than 1/8" i should more than likely have the servo pin replaced with the proper length, and more so make the guy who rebuilt it, do it again.