Author Topic: Manual trans trouble  (Read 7010 times)

Offline Postess89

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Manual trans trouble
« on: June 20, 2016, 01:34:39 PM »
Ok gents here is what ive got 1976 k10 with 350 v8 manual 4 speed trans (1 being granny) np205 transfer case. I think the trans is starting to go but im not sure and would like your opinions. It doesnt want to go into 1st gear but i can force it into gear (no grinding noise) shifts into 2nd and third easy enough. Doesnt want to shift into reverse but i can force into gear (grinds). If it were the clutch itd have trouble with all the gears right? And since it looks like ill either have to have it rebuilt or replaced should i take this time to upgrade it in some manner? Watcha guys think. My first 4x4 project. Trying to learn the ropes

Offline zieg85

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Re: Manual trans trouble
« Reply #1 on: June 20, 2016, 01:38:47 PM »
It could be a weak pressure plate where the clutch disc doesn't completely dis-engage but the clutch doesn't slip
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline roundhouse

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Re: Manual trans trouble
« Reply #2 on: June 20, 2016, 11:08:24 PM »
How long have you owned it ?

First and reverse are not synchronized and usually to get it into them you have to be sitting still or just barely moving

From neutral,  Sometimes it's easier to put it in second gear and then into first instead of trying to go directly from N to granny or reverse



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Offline Postess89

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Re: Manual trans trouble
« Reply #3 on: June 21, 2016, 09:25:20 AM »
I've had it for about a year. It shifted smooth through all the gears until about a week ago.

Offline hatzie

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Re: Manual trans trouble
« Reply #4 on: June 21, 2016, 11:32:36 AM »
I've never had an SM465 or NV4500 that liked to go into R or L without double clutching or being stopped.  It's the nature of un-synchronized gears.  2nd is another story.

Is the clutch pushrod properly adjusted for the correct amount of clutch pedal travel?
« Last Edit: June 21, 2016, 11:35:28 AM by hatzie »
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Offline Postess89

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Re: Manual trans trouble
« Reply #5 on: June 21, 2016, 11:43:56 AM »
The screw is maxed all the way out. Which reminds me. The clutch pedal doesnt want to return when i let up. But im pretty sure the spring is just getting caught. I give it a little help with my boot and it comes back up

Offline hatzie

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Re: Manual trans trouble
« Reply #6 on: June 21, 2016, 03:40:06 PM »
If the pushrod is maxed you have too much slop in the linkage.
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Offline Postess89

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Re: Manual trans trouble
« Reply #7 on: June 21, 2016, 06:48:57 PM »
Yeah that baby is maxed out. Ill have to take a look at the linkage and see what i can do. Its been that way since i bought it. Think part of the linkage is bent or?

Offline 1967KaiserM715

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Re: Manual trans trouble
« Reply #8 on: June 21, 2016, 07:15:29 PM »
You'll want to make sure the clutch arm( the part that holds the thrust bearing against the pressure plate) and the ball stud are not worn, this can cause max adjustment and incomplete clutch disengagement, eventually no disengagement


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Offline roundhouse

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Re: Manual trans trouble
« Reply #9 on: June 24, 2016, 12:47:55 PM »
Check the linkage with a bright bright light while someone else works the pedal

Lots of bushings and bearings that  are probably worn out


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Offline Postess89

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Re: Manual trans trouble
« Reply #10 on: June 25, 2016, 01:24:46 PM »
There really isnt much in the way of bushings that i could findand nothing appeared bent. The bellcrank could use a rebuilding but was still doing its job. The only thig i could find was some play in the clutch fork. Like it had slipped off the pivot ball. I ended up dropping everything from the bellhousing back. The retention clip on the clutch fork was pretty worn and there wasnt any grease left. But other then that there didnt seem to be any real obvious damage to the fork itself. I think what im going to do is just replace the bellcrank and clutch fork. Might replace the pressure plate and what not but i have to look at it yet. The thing only has about 500 miles on it. Then slap it all back together and see if that fixes the problem. If not then i guess I'll be dropping it again and getting the trans rebuilt or buy a used one

Offline 1967KaiserM715

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Re: Manual trans trouble
« Reply #11 on: June 25, 2016, 05:51:34 PM »
Replace the ball stud as well, sounds like the fork and ball are worn a bit, it's hard to see, but eventually the fork will crack on the ball seat area and cause loss of clutch


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Offline hatzie

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Re: Manual trans trouble
« Reply #12 on: June 25, 2016, 09:30:46 PM »
There really isnt much in the way of bushings that i could findand nothing appeared bent. The bellcrank could use a rebuilding but was still doing its job. The only thig i could find was some play in the clutch fork. Like it had slipped off the pivot ball. I ended up dropping everything from the bellhousing back. The retention clip on the clutch fork was pretty worn and there wasnt any grease left. But other then that there didnt seem to be any real obvious damage to the fork itself. I think what im going to do is just replace the bellcrank and clutch fork. Might replace the pressure plate and what not but i have to look at it yet. The thing only has about 500 miles on it. Then slap it all back together and see if that fixes the problem. If not then i guess I'll be dropping it again and getting the trans rebuilt or buy a used one
Not a transmission problem.
The clutch pushrod adjustment is maxed with a new clutch.
It's;
Wrong length pushrod.
Slop in the Z-bar pivots.
Slop in pedal pin or pivot.
Worn fork or fork ballstud or both.
Wrong throwout bearing for your pressure plate.


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Offline Postess89

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Re: Manual trans trouble
« Reply #13 on: August 03, 2016, 12:15:43 PM »
well i dropped the everything from the bell housing back. cleaned it up replaced a some seals u-joints. (just stuff that needed doing). then to try and fix the clutch problem i replaced all the linkage. new clutchfork, zbar, adujstment bar, the whole works. the throwout bearing and and clutch are rather new so i left that alone. got everything installed. pressed down on the clutch and it was really tough, may have had too much of the adjustment bar out. the adjustment bar popped off from the clutch fork with a loud pop. set it back up with less and the pedal just stays on the floor. took a look at the return spring and noticed that the other end was connected to the brake line :/ hoping it hasnt been like that the whole time. only spot i could see to connect it to is the a hole in the frame, so i did that with the same result. pedal just stays on the floor. not sure where i messed up and could some help. if it helps i can snap a few pics for you guys. also how many return springs should it have? mine only has one. connects to the bottom of the clutch fork and then to the frame. thnx in adance guys.

Offline roundhouse

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Re: Manual trans trouble
« Reply #14 on: August 03, 2016, 10:09:29 PM »
There is a spring on the pedal assembly itself under the dash I think
But the springs inside the bell housing on the clutch itself should hold the pedal up


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