late shift
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From: stafford VA
late shift
Im having a problem with my tranny shifting from 1st to second very late afterit gets warm. once warm it usually doesnt shift until 25-30 mph(no tach). then its just skips through second into third. if i get on it while in third it will downshift and second works fine, then it goes back to third np. is there a way to balance 1st and 2nd? BTw i should mention its an E4OD.
Thx for the help
Tim
Thx for the help
Tim
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Joined: Jul 2002
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From: stafford VA
late shift
all my brake lights work for now. with my trucks milage it should be getting to the fluid change and filter(or its second).
now im curious about that relationship. should i take it to a shop and have the tranny flushed? or just drain and refill? or is there a way to flush it yourself?
Thx
Tim
now im curious about that relationship. should i take it to a shop and have the tranny flushed? or just drain and refill? or is there a way to flush it yourself?
Thx
Tim
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Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
late shift
Sudsrat,
The brakelight correlation is in the computer control for the shift points. The computer uses a load sensing circuit that relys on the partiular draw from the brakelights to help determine the "cruise" mode. Not having anything to do with the cruise control, but rather an operational mode of the E4OD tranny. If the current draw from the brakelights changes, it sends erroneous info to the computer for determining shift points. Obviously applying the brakes would cause a change in operational modes since the transmission needs to downshift back through the gears as the truck comes to a stop. If one of the lamps burns out, the current draw changes. Note: I have, however, never had the absence of the high-mount stop lamp cause any ill efects. (running topless with a '92)
If I had not personally been an eyewitness to such a problem, I would NEVER have believed it. But I actually saw the replacement of a burned out brakelamp rectify an erratic shift operation in a '95 F350. This was AFTER a fluid and filter change that had little to no effect on the problem.
Abadriver,
You can drain and refill the tranny yourself by dropping the pan....its messy and you have to lower the pan in stages or it will fall from the bottom of the tranny while its still full of fluid. (Big red mess). Doing it yourself, however does not drain all of the fluid since there are several pints in the torque converter. If you want to have all of the old fluid evacuated, try one of the Jiffylube, Valvoline, type places. They have a suction device that gets the majority of the old fluid out before they refill it. Its not cheap, I think the place down the street here quoted me about $90.00 to do it...but if it saves me $2500-3000 for a remanned tranny, I'll pay it.
The brakelight correlation is in the computer control for the shift points. The computer uses a load sensing circuit that relys on the partiular draw from the brakelights to help determine the "cruise" mode. Not having anything to do with the cruise control, but rather an operational mode of the E4OD tranny. If the current draw from the brakelights changes, it sends erroneous info to the computer for determining shift points. Obviously applying the brakes would cause a change in operational modes since the transmission needs to downshift back through the gears as the truck comes to a stop. If one of the lamps burns out, the current draw changes. Note: I have, however, never had the absence of the high-mount stop lamp cause any ill efects. (running topless with a '92)
If I had not personally been an eyewitness to such a problem, I would NEVER have believed it. But I actually saw the replacement of a burned out brakelamp rectify an erratic shift operation in a '95 F350. This was AFTER a fluid and filter change that had little to no effect on the problem.
Abadriver,
You can drain and refill the tranny yourself by dropping the pan....its messy and you have to lower the pan in stages or it will fall from the bottom of the tranny while its still full of fluid. (Big red mess). Doing it yourself, however does not drain all of the fluid since there are several pints in the torque converter. If you want to have all of the old fluid evacuated, try one of the Jiffylube, Valvoline, type places. They have a suction device that gets the majority of the old fluid out before they refill it. Its not cheap, I think the place down the street here quoted me about $90.00 to do it...but if it saves me $2500-3000 for a remanned tranny, I'll pay it.
Last edited by greystreak92; Jul 28, 2003 at 02:08 PM.
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