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If you accelerate especially when using high gears such as the 4th and 5th gear and the RPM is able to increase freely with the speed struggling to catch up with the RPM, it means your clutch is worn out and is slipping.
You need to get the clutch replaced in order for this issue to be rectified, especially if your clutch have not been changed before.
Most likely a clutch problem. What, if anything, has changed recently? Does the clutch have 25 years of use, or has it been replaced? Is there some "free play" at the top of the clutch pedal travel? If not, you might try adjusting the clutch pedal to bell housing linkage to create such travel, just to make sure you are getting all the clutch pressure that its pressure plate can provide. It slips in low gear because that uses the most engine force to accelerate from a stop. As you shift up, you minimize the clutch load because you wait until the engine is revved up, indicating the acceleration load between shifts is not too great. In the highest gears you are driving at highway speed using very little power from the engine to maintain that speed. If you come to a slight upgrade, not enough to require downshifting, you add extra load, again more that the worn clutch can pass through to the axle. Do you "slip" the clutch or "ride it" when starting or driving? We minimize clutch wear by using the lowest gear that allows the truck to start without using the fuel pedal. This may be how and why you wore out your clutch. If you can't help the problem by adjusting the external linkage, you most likely need to replace the clutch. If you are unsure, try having a competent truck mechanic evaluate it first.
A weak pressure plate or worn out clutch disc can cause slippage when power is applied. Replacing the clutch is a big job which requires removal of the transmission. I would suggest taking it to a reputable repair shop to have the work done.
If this is a manual transmission and you get slippage at acceleration, then your clutch is slipping.
An adjustment might help a little bit, for a while, but I think I'd prepare myself for having the transmission pulled and the clutch replaced.
The clutch assembly is made up of 4 main elements: (1) the flywheel (bolted to the rear end of the engine crankshaft), (2) the pressure plate bolted to the flywheel (a spring loaded device that applies pressure to the clutch disc), (3) the clutch disc (sandwiched between the flywheel and pressure plate) that connects, via friction, the engine to the transmission, (4) the throw out bearing, which pushes against the fingers of the pressure plate to release the clutch disc engagement.
I'd seriously consider having some one do this for you....having to remove the transmission is not something for the faint of heart. Serious injury could result if the transmission were to fall on you while pulled back from the engine bell housing.
Oh, and another thing...I'd replace the pilot shaft bushing while I was in there.
If you really want to do this yourself, then go to your local auto parts store and purchase a vehicle specific repair manual. It should outline the steps specific to your car.
Remove transmission and check the clutch slave cylinder for leakage. Check fluid level and bleed if necessary. Remove clutch, pocket bearing, throwout bearing and pressure plate. Check for leakage from rear engine seal and front transmission seal. Remove and replace seal(s) if traces of oil are present. Check clutch for oil film and excessive wear, damaged or worn pressure plate (if close to tollerence, replace for convenience). Replace clutch components as necessary and reassemble using your manual for guidance. This should take care of the problem. I see you have changed your fuel filter and given a basic tune up so you should be good to go at that point (check compression and distributor timing) If timing belt has not been replaced around 60,000 then replace or you may end up on the side of the road. if any further questions let me know.
If yhe clutch is slipping there is not enough free playand you are not fully engaging. You should have a quarter to half in play before you feel resistance. go back under and adjust the link/rod or see if it is hanging up. Did you put the clutch disc in with the long part of the hub towards the pressure plate?
Hi there. Sounds like you have a slipping clutch and it’s most likely one of two main problems. The first is you need to see whether the clutch can be adjusted. If a self adjusting clutch, then the clutch plate may be worn and requires replacement. I’d have the problem checked-out quickly at either a Dealer or Clutch Specialist, the longer the clutch is slipping, the more damage you might be doing to either the flywheel or clutch pressure plate. Hope this helps, Scottech.