Question about 1986 Volvo 740

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Omar ive changed my automatic gearbox on my 850 Volvo,it goes into R,L,3 and D but the problem is that it doesn't change gears while im driving in D what is the problem? please help

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If you can, put an OBDII scan tool on it and look for codes in the P0730 range (incorrect gear ratio). Any P07XX code is a transaxle code. Alternatively, check that your shift lever is adjusted properly. Sometimes it may seem correct but since there are switches there it is possible that they are not making content in D.

The other possibilities are low line pressure (check/change the transaxle oil), low oil level (do not overfill, it may damage your newly-installed transaxle or cause fluid to be ejected out of the fill tube), valve body problems or sensors. Got a MIL lit? That's a sure bet there's something the computer wants to tell you about.

Posted on Nov 08, 2013


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Sounds as if a synchronizer is going out in 3rd gear, or 3rd gear maybe stripped. I would get it checked by a tranny (transmission) shop before it ended up costing you more money. There is a possibility that there may be some shavings on that gear as well, which would just need cleaned.

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SOURCE: Pulled Codes Volvo 1995 850 Need Help

I would lean toward the MAF sensor they were known for going bad, which would cause all these codes. It wouldn't hurt to take the IAC off and spray it out with carb cleaner and some WD40, just to cover your bases. Both these units were made by Bosch and the MAF failed alot more often then the IAC.

Posted on May 23, 2009

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Probably referring to gearboxes
A manual gearbox in a car requires a clutch that has to be disengaged when changing gear. This is done by a pedal operated by the drivers left foot. So a manual car has 3 pedals.
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