700r4 shifts weird when VSS is connected (video)
#1
700r4 shifts weird when VSS is connected (video)
Hey guys, I made a thread about this a couple months ago but after getting the correct connector it still has the problem. Whenever the trans shifts into 2nd it'll drop rpms like normal and then drop them again and chug. If I leave the speed sensor unplugged it shifts perfectly. the transmission is a rebuilt one with an estimated 3000-4000 miles on it. detent cable is also correctly set.
Skip to :30 seconds to see and hear it clearly. It may seem like I took my foot off the gas but I kept my foot on the gas at the same position the whole time this happened.
Skip to :30 seconds to see and hear it clearly. It may seem like I took my foot off the gas but I kept my foot on the gas at the same position the whole time this happened.
Last edited by TylerSteez; 07-25-2015 at 04:12 PM.
#2
Senior Member
Re: 700r4 shifts weird when VSS is connected (video)
seam like early trq converter lock up-
#4
Re: 700r4 shifts weird when VSS is connected (video)
So I unplugged the white 4 prong connector for the torque converter on the side of the trans and my problems went away. I'm wondering if it's safe for the trans to drive around like this for a little while until I can wire in an internal torque converter lockup kit?
I haven't had lockup for over 1.5 years so I'm not worried about that, I'm just wondering if that plug controls anything else besides lockup?
I haven't had lockup for over 1.5 years so I'm not worried about that, I'm just wondering if that plug controls anything else besides lockup?
#5
Senior Member
Re: 700r4 shifts weird when VSS is connected (video)
You can wire a -manual- lock up switch with ease, by using the ADL port.
#7
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Re: 700r4 shifts weird when VSS is connected (video)
The 1982 -1986 700R4's have 2nd, 3rd & 4th lockup. To get rid of 2nd lockup (which all 1987 & up 700R4's did), you will have to go through the wiring on the valve body and disable the 2nd gear lockup. Once this is done it will perform much better. GM was playing the CAFE games and trying to get maximum mileage "on paper" but in reality it made things much worse. When GM looked at the "real world", then they got rid of the "annoying" 2nd gear lockup.
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#9
Re: 700r4 shifts weird when VSS is connected (video)
The 1982 -1986 700R4's have 2nd, 3rd & 4th lockup. To get rid of 2nd lockup (which all 1987 & up 700R4's did), you will have to go through the wiring on the valve body and disable the 2nd gear lockup. Once this is done it will perform much better. GM was playing the CAFE games and trying to get maximum mileage "on paper" but in reality it made things much worse. When GM looked at the "real world", then they got rid of the "annoying" 2nd gear lockup.
#11
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Re: 700r4 shifts weird when VSS is connected (video)
You are going to disable the 2nd gear lockup, leaving 3rd & 4th only. The switches are on the valve body. The 3-4 switch on the valve body is next to the 2nd accumulator that bolts to the separator plate in the corner. Do not use a manual lockup switch that will not unlock automatically when you go to WOT or when you let off the throttle. This setup tends to tear up the torque converter clutch. If you have the transmission out update the input shaft capsule to the 1995 & up GM "dual feed" capsule. This will improve the lockup and improve the torque converter clutch life without making lockup annoying as when you remove the capsule altogether.
#12
Re: 700r4 shifts weird when VSS is connected (video)
You are going to disable the 2nd gear lockup, leaving 3rd & 4th only. The switches are on the valve body. The 3-4 switch on the valve body is next to the 2nd accumulator that bolts to the separator plate in the corner. Do not use a manual lockup switch that will not unlock automatically when you go to WOT or when you let off the throttle. This setup tends to tear up the torque converter clutch. If you have the transmission out update the input shaft capsule to the 1995 & up GM "dual feed" capsule. This will improve the lockup and improve the torque converter clutch life without making lockup annoying as when you remove the capsule altogether.
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08-30-2015 12:52 AM