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Re: 1976 jeep cj7 transmition
Not a lot to go on here! But, Sounds like this has an auto trans? If it has, get a socket on the front crankshaft pulley nut, turn the engine just a bit back an forth. If you hear a metal to metal 'clunking', then remove the inspection cover at the front bottom of the trans. Now move the flywheel with a screwdriver, you will find that the flex-plate is loose or broken. If its a manual trans, None of this applies! Frankster016
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Distributor shifted on you and timing is out of phase. turn the distributor about 1/4 inch counter clockwise with your hands and test drive it . if it improves you have a busted bolt on the core (not uncommon for an old CJ) .. may need to tighten bolt or drill out a new thread and put a tight bolt in . When you are out of phase, it sounds like you have an exhaust problem , loud noise in exhaust and no compression nor acceleration , except in lower (high rev) gears. jorge diaz
I would like to think so Mailmen work in all weather conditions. So hopefully it was a reliable jeep. The problam with it now would be that it would have high mileage since it is a mail man. Upside the United States Postal Service paid for the upkeep so it has been taken care of really good.
First, if the noise is from the upper part of the engine and is more of a tapping than a knock, likely you have a problem in the valvetrain, most often a bad lifter or worn rocker arm. If the noise is low, deep inside, the noise is from a bearing. This is generally accompanied by lower than normal oil pressure. Regardless of the underlying cause, correcting the cause will not stop the knock. To do that correctly, the engine needs to be removed and all crankshaft bearings and the crankshaft itself need to be replaced (crank can sometimes be "undercut" and thicker bearing shells can be used depending upon the amount of wear.) If caught very early, sometimes only one bearing can be replaced in-car, but in 99% of all cases I have ever seen, most will fail again, sometimes more severely if done this way.
you have a bent shift fork or shaft, you will need to remove the dust boot pull the shift snap ring it the shifter is in the floor and pull the shifter stick off then remove the transmisson top cover and replace the reverse first shift fork, this is the most common cause, if it has a columm shifter then disconnet the shifter lever and try shifting if it shifts then you have bent linkage and will need to figure out where it is located.
likely the shift rails are worn inside the trans. In changing shift, you have removed the wear on the end of the stick, but not the corresponding wear where the stick fits into. It will need to be taken apart to repair this. (would not hurt to have synchros replaced at the same time.) OR, replace transmission if you have an inexpensive one available.