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Member Since 15 Nov 2017
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#1548748 84 720 Z24 TRANS

Posted by drb5721 on 28 February 2018 - 03:14 PM

The write up is actually pretty simple lol. 

I started by unbolting the driveshaft and removing it and the center support bearing bracket. 

Then I proceeded to unhook the speedometer cable and any harness connectors on the trans.

Unbolted the slave cylinder.

Disconnected shifter lever.

Unbolted trans crossmember and mount.

Unbolted bellhousing.

Lowered trans to ground.


The ka trans will HAVE to have the shifter removed.

I cut the hole for the shifter open towards the rear and additional 6-8 inches and about an 1in total in width more than the already existing hole.

I unbolted the pressure plate and dropped it and the clutch out.

Then I proceeded to lifting the trans into place. 

Jacking up on the rear of the engine helped alot here.

Once the trans is sitting on the main crossmember, I then installed the clutch and pilot tool and bolted in the pressure plate.

Wiggle trans forward for bellhousing mating. 

Remove the speedo sleeve and install into KA trans.

Reconnect the speedo cable and any wiring/sensors.


Basically done at this point. The only thing to do here is to either fab a mount/crossmember or dremmel the holes SLIGHTLY farther back to make everything bolt up properly. 

Then you are onto the slave cylinder and driveshaft.

The slave will have to be from an s chassis as the hose is mounted to the slave a little different and the 720 slave will hit the bellhousing stopping it from being able to bolt up.

The driveshaft, in my case, 2wd KC, will need shortened roughly 4in. 

Shifter access is easily achieved after enlarging this hole in the tunnel so you can fill the trans once the driveshaft is in. 

Install shifter plate. 


I do not know how much of this can be used with a 4wd nor do I know if any measurements will be the same. 

Attempt at your own risk.

#1548744 Bonded Titles?

Posted by drb5721 on 28 February 2018 - 02:36 PM

What companies have you guys used in the past? Have one right now that I bought from a guy who sent in all the paperwork. It was a NC title and he lives in SC. He was planning to make it a shop truck but ended up not having time to work on it. Three weeks after purchase I agree to buy it. Was initially going to wait on the title but some things came up and it was either get it or miss out on it and the other I was getting from him. So now, I have my 83 with nothing more than a bill of sale from him to me. This is the same truck I just swapped the KA trans into so I could start getting it "operable" for a DMV inspection.

#1548590 84 720 Z24 TRANS

Posted by drb5721 on 27 February 2018 - 06:30 PM

For future reference, from centerline of the front u-joint to the centerline of the rear for a s13 trans the driveshaft will measure 55" or 56.5" from front u-joint to diff flange. This is all in a king cab

#1548182 84 720 Z24 TRANS

Posted by drb5721 on 25 February 2018 - 12:06 PM

I wish. Gotta measure and call a driveshaft shop.

#1548091 84 720 Z24 TRANS

Posted by drb5721 on 24 February 2018 - 07:26 PM

Definitely an s chassis trans. Driveshaft will certainly have to be shortened by a couple inches. Plus the shifter is a different setup between each of those.

#1548023 84 720 Z24 TRANS

Posted by drb5721 on 24 February 2018 - 12:47 PM

Got it in, bellhousing bolted up. Had to slot the holes in the crossmember and trans mount but everything worked out pretty smooth. Not sure what the purpose of the shock that bolts to the trans and crossmember beyond rotational dampening. Didnt mount it back yet. If it's needed and recommended I will. Need a slave cylinder and to bolt up the starter then its on to the driveshaft

#1547814 84 720 Z24 TRANS

Posted by drb5721 on 23 February 2018 - 02:18 PM

Oh absolutely. Haha. Just wasn't holding my tongue right last night. I was late, arms were tired. 

#1547782 84 720 Z24 TRANS

Posted by drb5721 on 23 February 2018 - 11:11 AM

Trans is perched on the crossmember. Still have to bolt it to the block. Having a hard time getting it to seat into the clutch/pilot hole. Anxious to make this happen.

#1547080 84 720 Z24 TRANS

Posted by drb5721 on 20 February 2018 - 08:26 AM

I will be updating this as it seems to be the way to go at this point. I tore down the bad transmission this morning to find that the main drive gear is shot henceforth not turning anything regardless of what gear I shift to. So now, onto the install of the s13 trans. Yay! Somewhat of a relief. I guess i will go home, grab the driveshaft out of the truck and see how much sizing needs to be done. Somewhat happy this seems to be a possible solution.

#1546892 84 720 Z24 TRANS

Posted by drb5721 on 19 February 2018 - 09:41 AM

Bought my 84 720 under the impression it needed a clutch. Engine runs great and I felt the clutch could be the culprit when I had the engine running and could throw the trans in any gear without any issues without using the clutch. Checked fluid level and slave motion. All looked ok. Proceeded to remove trans in hopes of seeing a clutch fiber furball. To my surprise. No furball. Clutch disc looks relatively decent. So I grabbed the input shaft and the output shaft and could spin them independently of each other regardless of what gear it was in. Seems as if a shaft broke or a gear or something. Very noisy and no fluid came out when I pulled the driveshaft. 


My question pertains to a replacement. I have a spare S13 KA trans sitting in my storage truck. Bellhousing of course is identical. However, the shifter bolts in whereas the truck pops in and is held in via the mounting plate. Is there anything I can do with the KA trans? Parts? Simply swap it in and maybe trim the opening and use it? 

#1532523 83 720 torsion arm adjusting bracket bent bad

Posted by drb5721 on 02 December 2017 - 11:30 AM

One ear was bent a full 180 and even with heat it is breaking. For longevity, a replacement is probably in order.

#1532509 83 720 torsion arm adjusting bracket bent bad

Posted by drb5721 on 02 December 2017 - 09:44 AM

Is this arm the same across the 2wd d21 chassis as well?

#1532314 83 720 torsion arm adjusting bracket bent bad

Posted by drb5721 on 01 December 2017 - 08:20 AM

Finally got it out. Thank you guys for the help. We will see if heat and such will make this think right again.

#1532144 83 720 torsion arm adjusting bracket bent bad

Posted by drb5721 on 30 November 2017 - 11:45 AM

Awesome. I was thinking there had to be something else I was missing. Thank you for the great photo view.

#1532073 83 720 torsion arm adjusting bracket bent bad

Posted by drb5721 on 30 November 2017 - 07:21 AM

So havent had much time to work on it but i was out last night looking. Ive got the splines moving out of the front but its only moved about an inch or so. Not wanting to budge anymore. The 2 nuts where the bar splines in up front are loose to help release any tension. Am i missang a circlip or something? I dont see anything else holding it from moving but i may be overlooking a snapring or something. Idk of thats only in 4wds or not. Mine is 2wd