4R70W problem in a 1999 F150 4.2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 3 (permalink) Old 05-30-2019, 08:03 AM Thread Starter
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4R70W problem in a 1999 F150 4.2

I posted this in the F150 forum 2 days ago. I have had 168 views and no responses, so I try here too.


My son has a 1999 F150 4.2 RWD with 4R70W. It has 210K miles. It takes 5-10 seconds to go into drive. It goes into reverse immediately. It shifts good 1-2, 2-3, 3-OD. Downshifting is good between all gears.
If you give it some RPM's, it slams into gear, like my dumb friend in high school shifted his 70 Nova 307 to make it chirp a tire in 1988.
Doesn't slip at stoplights, or on highway.
Daily driver.
Trans filter and fluid changed twice in last 2 years with new Merc V or VI, I don't remember, last time was 8 months before symptom started.

Torque converter failing?
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post #2 of 3 (permalink) Old 05-30-2019, 08:12 AM
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Re: 4R70W problem in a 1999 F150 4.2

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Originally Posted by 65FalconSix View Post
I posted this in the F150 forum 2 days ago. I have had 168 views and no responses, so I try here too.


My son has a 1999 F150 4.2 RWD with 4R70W. It has 210K miles. It takes 5-10 seconds to go into drive. It goes into reverse immediately. It shifts good 1-2, 2-3, 3-OD. Downshifting is good between all gears.
If you give it some RPM's, it slams into gear, like my dumb friend in high school shifted his 70 Nova 307 to make it chirp a tire in 1988.
Doesn't slip at stoplights, or on highway.
Daily driver.
Trans filter and fluid changed twice in last 2 years with new Merc V or VI, I don't remember, last time was 8 months before symptom started.

Torque converter failing?

Hello 65FalconSix,

It's not the torque converter if it goes into reverse normally. There is a problem either with the forward clutch or the hydraulic circuit leading to the forward clutch. Most likely being 20 years old the seal in the forward clutch is failing. Which if the case then it's time for all the seals in the transmission to be replaced in order to be reliable.

Good luck.
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post #3 of 3 (permalink) Old 05-30-2019, 02:43 PM Thread Starter
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Re: 4R70W problem in a 1999 F150 4.2

Thanks for the quick response. I just went home for lunch and my son got together with his grandpa (my dad) and they ordered a new trans that comes with a new torque converter and 5 year unlimited mileage warranty for $1100.

I paid $1800 to get my Ram's 46RE rebuilt with a new torque converter almost two years ago.

It's probably for the best, I would have bought this one seen on craigslist as a parts car:

Lincoln LSC Coupe, 1998, parts or whole have title Has over 200K. Excellent body bad leather driver seat.
Has 32 Valve Intech 4.6 motor. Last ran a year ago.
Will take $800 for whole car.



and done a motor-trans-wiring harness-ECM-seats-rear suspension swap, see if I could make the instrument cluster work and sell or scrap the body.

Would that have made it an F150 LSC? 32 valve DOHC motor, 8.8 3.73 LS Indie rear, those seats!
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