After the car has been driven a few miles and warmed up, it appears to lose pulling power during shifting at 2RPM in 2nd gear and the same in 3rd gear, but not as often as in 2nd gear. The engine/heads were rebuilt about 2 years ago and the car has only been driven 5-7,000 miles since then. Where do I look first to determine the problem? Thank you.
Check your transmission fluid if it is an automatic. Also it should not be shifting yet at 2000 rpm. It would bog down when shifting at that low of an rpm for sure. It needs to get to around 2500 or so and if you are pulling a load or going up hill probably shouldn't shift until it reaches 3000 rpm. These are conservative rpm's to be shifting at even. It depends on your particular vehicle and what you are doing with it to determine the ideal rpm to be shifting at. Whether you have an automatic or manual transmission, 2000rpm is going to be shifting too soon and you will lose pulling power.
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Check your transmission fluid if it is an automatic. Also it should not be shifting yet at 2000 rpm. It would bog down when shifting at that low of an rpm for sure. It needs to get to around 2500 or so and if you are pulling a load or going up hill probably shouldn't shift until it reaches 3000 rpm. These are conservative rpm's to be shifting at even. It depends on your particular vehicle and what you are doing with it to determine the ideal rpm to be shifting at. Whether you have an automatic or manual transmission, 2000rpm is going to be shifting too soon and you will lose pulling power.
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Check fuel flow and pressure , if pressure is low check fuel pump. if flow is low replace fuel filter.
SOURCE: 1994 ford E350 E40D trans/7.3 diesel Shifts
the solenoids in the trans may be sticking,try adding 1 pint of dot 3 brake fluid to the transmission fluid and drive it for a while-give it a chance to work..the brake fluid acts like a cleaner and it makes worn seals and clutches swell a little.just drive it easy for about 20-30 miles,its only about $3.00 and it could save a $1,600.00 rebuild
SOURCE: 1997 Ford Taurus, Won't Shift Past 3rd Gear
The forward clutch control valve has a retaining clip that is known to break on these tranny's. This can prevent it from shifting into 4th gear. Good news, the part is five bucks. Bad news, it's in the valve body which takes a few hours to get to. I fixed mine in about 8 hours thanks to great step by step instuctions I found online. Search for "valve body removal taurus tranny". If it's not the retainer clip then it could be one of the solenoids on the valve body. I believe there's one just for 3rd and 4th gear. Good luck
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