Re: my transmission will not shift out of first gear
Your shift cylinoids mite be out or the clutches may be burnt time to replace the tranny it sounds like could be the valve body or real low on fluid check the fluid and smell it if the fluid smells burnt chances are its cheaper to just replace the tranny
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a vacum modulator does not prevent a car from shifting into gear. Usually when a car fails to move, internal parts of the transmission break and sometimes shatter prevent the clutch pack from functioning. The purpose of a vacum modulator is to allow the transmission to shift smoothly from one gear to the next, but now on allot of cars these days transmissions are solely controlled by the computer. If you transmission does have a vacum modulator then your will find a steel vacum line from the engine going to your transmission with short pieces of hose connecting the lines together.
it may be a bad transmission modulator valve located on the side of your transmission,vacum operated. a sudden downshift or forward shift when unexpected is sign of a bad modulator valve or a vacum leak to the transmission.best to shop around for a garage w/references when it comes to transmission work though. check all the vacum lines to your transmision,you need to look on the underneath side of your truck on the side of transmission for a loose or disconnected vacum line on the side of the transmission. when you feel the vacum line,follow it to the top of engine,the vacum line is about 3/8th line,and may be disconnected or losing air. to make this short,when you drive the car,start out in low gear and shift the transmission,manually from 1st to 2nd to 3rd does it do right with no slipping? if it does this right and shifts great manually,the modulator valve on the side of the transmissions bad,or a bad vacum leak in-between.thank you for choosing fixya.com
suggest you check for a vacum line off that goes to the transmission modulator valve, which controls the shifting in transmission.or may possibly just be a bad modulator valve on the side of the transmission. 1st check for a vacum line off, with engine running do you hear a whistling or air sucking sound on top or rear of motor? if so, follow that sound to a hose or small black hose thats off.if you are driving the car and start off in low drive and can manually shift to upper gears with no problems,your problem is either a vacum line off, or it's a bad modulator valve on the transmission. hope this helps!!!
The vacume hose on the vacume modulater on the trans mission is nt hooked to full engine vacume or the engine isn't making vacume.The governer will make the trans shift to second anyway at redline but it's preety hard on an old car to redline it just to find out/ It's possible that youv'e got the shift detent cable that hooks to the carb set too tight or it's stuck as if it's floored. with the cable disconnected it should shift out al the way real early as long as thirs vacume on the modulater. Gas mileage freaks that drive around slowly unhook th shift cale so the trans shifts into high gear real early. Not much for passing and acceleration but they get a little bit better gas mileage.
Check all your vacume lines for leeks.If there are no leeks then may have a bad modulater.There will be one vacume line that goes down your fire wall to your trans.Where the vacume line plugs in,this is your modulater and controls your shifting.The part runs anywhere from $10-15 for a new one and most just screw into the trans or have a fork retainer with a single bolt.This only applies on gas motors.Well good luck and hope this helps.,