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#1
10-02-2010, 07:51 AM
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trans issues
so i have been driving my car a lot lately on the interstate. (brand new certified tranny with mobil 1 fluid in it) It seems like on the interestate when i'm steady at 75 it will slip and then go back into 4th and then overdrive. what would cause this? it doesnt do it around the city at all! i can go 55 and nothing will happen. but around 75 to 85 it will. it seems like its getting confused.
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94 Subaru SVX FWD 51k  04 Mazda B4000 (work truck) 
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#3
10-02-2010, 08:41 AM
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Re: trans issues
Quote:
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Tony 1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads 2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil 2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil 1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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#4
10-02-2010, 09:26 AM
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Re: trans issues
Quote:
 My laguna on occasion does the same thing.
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#5
10-02-2010, 10:14 AM
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Re: trans issues
Yes, check the adjustment of the TPS.
When you had the trans installed did you have an external cooler added? If the ATF gets too cool it will unlock the torque converter.
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0
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#6
10-02-2010, 10:20 AM
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Re: trans issues
i do not have a external cooler installed yet on it. i have one that i'm gna put on it with a filter kit and i'm gna run a gauge. but a tps sensor is 254 bucks at my parts store in my town!
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94 Subaru SVX FWD 51k 04 Mazda B4000 (work truck)
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#7
10-02-2010, 10:23 AM
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Re: trans issues
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 Last edited by Hocrest; 10-02-2010 at 10:26 AM.
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#8
10-04-2010, 06:10 AM
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Re: trans issues
Quote:
As others have suggested, try cleaning/adjusting first. My TPS "bad spot" was 50-55 MPH in 4 the gear. 75 strikes me as a bit high for a typical throttle position. dcb
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#10
10-02-2010, 07:10 PM
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Re: trans issues
Yes the TPS can be a cause of the, torque converter unlocking and locking up again. The vibration of the throttle shaft, causes the TPS wiper to etch the carbon tract, to form a bad spot. This usually is at the throttle position that, the car usually cruises at.
The Overdrive term is just that, to drive over the 1:1 ratio. As Dave says the gearbox gearing is higher/over 1:1, so our 4th is an overdrive ratio, as 3rd gear is 1:1. This really does not mean as much to-day as it did when we had 3 speeds and a add on box, to provide an OD ratio. Now most boxes have 4th gear at an overdrive ratio. Locking the converter, is more about economy than raising the ratio, as it can lock in other gears too. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls.
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