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Needing help big time on a transmission issue

2216 Views 5 Replies 4 Participants Last post by  SoCal2V
This is not about a mustang. it is about my little brothers 95 thunderbird V8. it shifts into reverse like its brand new but wont go into first very well and when it does the rpm's kick it hard and spin the tires. same problem when he slows down. the transmission kicks out of gear and creating the problem again. what could the problem be? and what all transmissions could i easily put into his car? just in case it is easier just to replace it. i have looked online and can find nothing so im coming to you guys for help
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4R70W is what it has...I'd just have it rebuilt
A revised version of the AODE was released in 1993 with the Lincoln Mark VIII. Compared to the AODE, it has lower 1st and 2nd gear ratios for better take-off acceleration and was designed for better gearset strength. On vehicles powered by a 5.4 L V8, a stronger gearset is used than in normal duty 4R70Ws. In 1998, due to durability concerns, the intermediate one-way roller clutch was replaced with a mechanical diode providing extra holding capacity and longer service.
While there is speculation that the 70 can be multiplied by 10 to indicate the ft-lbs of torque this transmission is capable of handling including torque converter multiplication, (i.e. 700 ft-lbs of torque), there is no reliable source indicating this. In fact a Ford document stated that the 2003 "Expedition's 4R70W transmission is rated to handle up to 506 foot-pounds of torque, which provides a large performance cushion beyond the peak torque rating of Expedition's largest available engine." . It is more plausible that the number indicates the torque handling capability in N-m, as 506 ft-lbs converts to 686 N-m which could be rounded to 700 N-m. The "70" may also refer to the transmission's torque capacity after torque converter multiplication which occurs at low rpm's when the torque converter is more "elastic". 4R70W stands for 4 gears, Rearwheeldrive, 70 is a measurement of horsepower and Wide gear ratio compared to the AODE.
The gear ratios are: 1st: 2.84 :1 2nd: 1.55 :1 3rd: 1.00 :1 4th: 0.70 :1 Rev: 2.23 :1
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