Jump to content

Progress on 85 720 4x4 (Merged threads)


la_leo

Recommended Posts

Are you sure the clutch is actually working, you can see the clutch slave move when someone presses on the clutch pedal?

. Positive. Got a new slave and master. Bled the whole system. Got a great pedal. The slave moves the clutch fork great. It's just not disengaging
  • Like 1
Link to comment
  • Replies 256
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

It's a major operation to remove the transmissions in one of these 4X4 trucks, I am saying MAJOR operation if you look at others threads that have done it, I am of the opinion that it might be easier to remove the engine/transmission than it is to just remove the transmission, as you have to remove a shitload of stuff to get that transmission out of there.

  • Like 2
Link to comment

Yeah I'm seeing that now. Any suggestion on an affordable clutch kit? The LUK says heavy duty (part # 06901.) I just got the engine put back together! New fluids and everything. I'm going to research more how to PULL the transmission without pulling the engine.

  • Like 1
Link to comment

Yeah I'm seeing that now. Any suggestion on an affordable clutch kit? The LUK says heavy duty (part # 06901.) I just got the engine put back together! New fluids and everything. I'm going to research more how to oil the transmission without pulling the engine.

 

I suspect that you have a 240mm clutch cover/disc, but I don't know it, I generally don't buy stuff till I know what I need.

What does "oil the transmission" mean, if it means to put gear oil in the transmission, don't bother right now, you need to figure out what is wrong with it before you start putting money into it, right now what I would do is get the transmission out and either replace it with another known good one or figure out why 5th gear don't work, then put it back together with good parts.

I personally have never had a clutch disc get stuck to the flywheel, would be interested in seeing how/why that could happen.

  • Like 1
Link to comment

I suspect that you have a 240mm clutch cover/disc, but I don't know it, I generally don't buy stuff till I know what I need.

What does "oil the transmission" mean, if it means to put gear oil in the transmission, don't bother right now, you need to figure out what is wrong with it before you start putting money into it, right now what I would do is get the transmission out and either replace it with another known good one or figure out why 5th gear don't work, then put it back together with good parts.

I personally have never had a clutch disc get stuck to the flywheel, would be interested in seeing how/why that could happen.

. Stupid auto correct!!!!! REMOVE the transmission. I've had one truck with aa frozen clutch. The clutch rusted to the pressure plate but it freed after dropping the Jack down with the wheels spinning in gear. Yeah i bought a gallon of sta lube gl4 today. I'm saving it for after i sort this mess out.
  • Like 1
Link to comment

I can get a Beck Arnley clutch kit for 115 or an LUK BRAND for 130. Anybody suggest one over the other?

I used an Exedy OEM clutch kit, and it's been working like a charm.

 

If you have access to a lift, it's not that bad to remove a transmission. My cousin and I replaced my clutch in 5 hours; you just have to unbolt the most forward cross-member, disconnect the driveshaft, and the transmission drops out with a little tilting and sliding. You'll need to tear apart the interior and remove the sound-dampening around the shifter boot, but I guess that's just part of the job. 

  • Like 1
Link to comment

I used an Exedy OEM clutch kit, and it's been working like a charm.

 

If you have access to a lift, it's not that bad to remove a transmission. My cousin and I replaced my clutch in 5 hours; you just have to unbolt the most forward cross-member, disconnect the driveshaft, and the transmission drops out with a little tilting and sliding. You'll need to tear apart the interior and remove the sound-dampening around the shifter boot, but I guess that's just part of the job.

 

. I have no interior lol. So that's done. It seems the LUK heavy duty is the only one that comes with a new throw out bearing. I have access to an auto lift and trans Jack so that will help
  • Like 2
Link to comment

I've used Luk clutches in my dime.. and a few other cars. Was recommended to me by someone that used to run a clutch shop.. so far, never been an issue and they are cheap. 

 

I think I've installed 3 luk clutches to date.

  • Like 1
Link to comment

The PP could be damaged, maybe a diaphragm finger bent.

 

It's an '85 so Z24 and they were all 240mm. But someone could easily have swapped a 225mm flywheel on with a smaller clutch. Even the transmission could have been swapped.

 

 

 

 

 

 

This is a three pipe problem, Watson.....

 

maxresdefault.jpg

 

Patience! All will be revealed!

  • Like 1
Link to comment

. I have no interior lol. So that's done. It seems the LUK heavy duty is the only one that comes with a new throw out bearing. I have access to an auto lift and trans Jack so that will help

You're set then! I bought my Exedy kit off of Amazon, so it came with a new throwout bearing, but LUK brand is good too. Just as long as you have the right sized clutch (240mm I think?) you should be gucci. 

  • Like 2
Link to comment

Thanks for the advice fellas. I don't think taking the torsion bars, crossmembers, front differential, and axles would be difficult to remove, just bolts really. Time consuming for sure. Sucks though I was excited to drive it around my property after I changed the clutch cylinders. So far, I have 1050 dollars in the truck. I don't count my labor! I made a list yesterday of things I know I need. I figure another thousand and it'll be driveable. 2500 should get me where I WANT to be with the truck. I am concerned with a rattle in the engine bay. I'm really thinking it's the timing chain. Seems odd at 87 thousand miles. I'd LOVE to fix the AC but that's literally the last thing on my list.

  • Like 1
Link to comment

I'll definitely check on the 5th gear issue. As you suggested I'll change the rear main. It's VERY likely I'll let my loCal transmission shop do the job. I mean I figure he can fix the 5th gear problem easier than I can. He's high on labor though, about 500 to pull this transmission.

Link to comment

I talked to a few trasmission shops. One guy said that 5th gear may require a rebuild or another transmission. According to him 5th is located on the rear of the transmission and may have sheared from the main shaft. Can anyone confirm this? Anybody have a good used 5 speed transmission for sale? ????

  • Like 1
Link to comment

He's merely setting you up for a big bill. Early five speed transmissions the main shaft nut sometimes backed off destabilizing reverse and 5th but mostly 5th which is farther to the rear. Not likely the case with later transmissions.

 

Does reverse still work? it's on the same shift fork.

  • Like 1
Link to comment

I had my work truck transmission lose 5th gear, but I also lost reverse, mine did shear the cluster gear shaft.

This is what the front cover looked like.

DSCN4513.JPG

 

DSCN4514.JPG

And this is what had happened.

DSCN4521.JPG

The broken piece.

DSCN4522.JPG

What had happened is that one of the cluster gear bearings went into the transmission, got between the gears and forced them apart, this busted the cluster gear shaft at the rear bearing, this transmission is parts now.

 DSCN4536.JPG

This is why I asked if yours was making noise, if it is quiet and you have reverse, then your cluster gear shaft is likely fine, and your 5th gear issue is something else, not a sheared shaft.

It's not that hard to take the front case off one of these transmissions, the rear case is a little harder to remove/replace, you have to remove the 5th/rev lockout.

  • Like 1
Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.