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4r70w ford trans cuts loose {freewheels} on moderate ...

Sent to Car Experts September 22, 2005 4:45 p.m.

4r70w ford trans cuts loose {freewheels} on moderate to hard accel. is full of fluid fresh rebuild lasted 2000 miles than burned od band int. clutches &fwd clutches

Customer (name blocked for privacy)

Status: Closed Value: $10

Answer
September 22, 2005 7:00 p.m. (2 hours and 14 minutes later)

REPLIED

Tear the trans down and inspect the rear area of the trans case. The output shaft has 3 hard seal rings that can wear grooves in the case. Some rebuilt units have sleeves installed in the rear case bore and the sleeve blows out and causes a loss of pressure. Either that or the seal rings on the back of the pump have worn into the forward clutch drum. Need to examine and air check all clutch packs. These transmissions are fairly simple to identify faults with. If you need some more information just let me know.

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Reply to Gene
Sent September 22, 2005 7:48 p.m. (47 minutes and 41 seconds later)

nope just had trans apart case is smooth and rings are new I am a transmission tech with over 30 years experience This is going to be a tough one to solve

Customer (name blocked for privacy)

Info Request
September 22, 2005 7:50 p.m. (2 minutes and 39 seconds later)

REPLIED to Info Request

Well it helps with all the information that is for sure. What originally failed in the trans and is it the same concern or are you having a different trans concern since the rebuild?

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ASE Master w/L1 Advanced Engine Performance, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.

Reply to Gene
Sent September 22, 2005 8:10 p.m. (19 minutes and 54 seconds later)

first time here no reverse od lite flash limp mode? rev band was burned od band burned int clutches burned on top of that trans had been rebuilt previously details I first gave you are after second repair

Customer (name blocked for privacy)

Answer
September 22, 2005 8:29 p.m. (19 minutes and 10 seconds later)

ACCEPTED

Weird to see the reverse band burnt up. Sounds like you are having a valve body problem. Either one of the pressure control valves is hanging up or a bore is damaged, I would take a real good look at the main control. As long as everything air checks ok,only other thing to check is the od servo bore bleed hole, make sure it is clean, it is a very miniscule hole in the servo piston bore that becomes clogged. and may be causing the band to stay applied. Only other thing I can think of without looking it over is if the trans endplay is too tight/intermediate clutch pack being too tight.

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Gene -- Auto Service Technician -- 99% Positive Feedback on 499 Car Accepts
ASE Master w/L1 Advanced Engine Performance, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.

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