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Old 09-07-2015, 10:12 PM   #1
Tim Keith
 
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Default grinding when shifting into 1st gear

Truck is a '94 2.4 with five speed. I figure it needs a clutch job, or could the clutch slave be the issue.
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Old 09-07-2015, 10:19 PM   #2
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sounds like your synchros man. There is one for every gear. will require a complete tear down to replace
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Old 09-07-2015, 10:23 PM   #3
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Quote:
Originally Posted by Tim Keith View Post
Truck is a '94 2.4 with five speed. I figure it needs a clutch job, or could the clutch slave be the issue.
its probably the synchronizer mine does it in 3rd gear, unless there is no load on the trany and then it will do it at a low rpms without a bit of grinding
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Old 09-07-2015, 10:30 PM   #4
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my 93 only does it from 1st to 2nd, if I drive slow and shift slow it doesn't grind, any kind of speed shift and it will grind
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Old 09-08-2015, 12:20 AM   #5
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the clutch slave cylinder, the line or the master cylinder could also be leaking. if the fork isnt pressed all the way to release the trans from the fly wheel, you will have some gear clash.

changing the trans fluid with genuine GL4 and adding some lucas manual trans additive to it has been known to silence these trannies also.

dont always assume the worst thing.........check the clutch fluid and ensure that everything is working, then have it services. and i can not stress enough about GENUINE GL4 ONLY!!!!!!!!

your in texas. it gets hot as fucked dammit there. i betcha its broken down gear lube. its lost its ability to do its job. try that after you verify the slave cyl and all are properly working.
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Old 11-04-2017, 01:11 AM   #6
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My 86 HB is 5 speed and it even grinds horribly in neutral! It just started this Crap today. If I depress the clutch in FULLY TO THE FLOOR truck makes a horrible loud grinding noise. Clutch has to be pushed in ALL THE WAY and it does it in every gear including neutral.
What the eff?
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Old 11-04-2017, 01:26 AM   #7
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i would verify that the clutch fluid is full, make sure there are no leaks in the slave cylinder, the fluid line and the clutch master cylinder. they like to leak back down the push rod behind the carpet. if it is leaking, the slave cylinder might not be fully releasing the pressure plate and then the input shaft is still turning.

then check the trans oil. make sure its full. it should be gold like honey. and use ONLY genuine GL4. anything else will kill the brass metals in the transmission.
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Old 11-04-2017, 02:00 AM   #8
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Mine getting dropped and rebuilt in spring. 2nd to 3rd.
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Old 11-04-2017, 03:38 AM   #9
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woah, thread resurrection
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Old 11-04-2017, 06:14 AM   #10
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Quote:
Originally Posted by leegreen72 View Post
My 86 HB is 5 speed and it even grinds horribly in neutral! It just started this Crap today. If I depress the clutch in FULLY TO THE FLOOR truck makes a horrible loud grinding noise. Clutch has to be pushed in ALL THE WAY and it does it in every gear including neutral.
What the eff?
This is NOT the transmission. Trust me on this. If you had worn synchros it wouldn't do that all at once, but a gear here or a gear there. This is a shift or clutch problem somewhere.

Check clutch fluid. Check operation of clutch slave cylinder down at the trans. Have someone sit inside the cab and depress the clutch. Unless it has full movement, it isn't working. It probably has a leak. If all that fails, and the slave seems to be working fine, it's possible your clutch assembly is fried, but I doubt it. You would know your clutch is getting weak far in advance of all that happening suddenly. For example, if your pressure plate is weak, when you floor it on the freeway the engine will rev up higher but the truck won't gain any speed. If your disc was going, you would have noticed that a while back. If your throwout bearing was going, you would have heard noise from it for a while now. This is a fluid/slave problem almost for sure.

And for God's sake...don't keep trying to shift it and grinding those gears until you fix the problem. When you FIX the problem...drop the old gear oil and replace it. If you have a lot of miles on the original clutch assembly, I would also switch out all that stuff just on general principles. That means disc, slave cylinder, throwout bearing, and pressure plate.
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