4spd to a 5spd

[Zsled]

This weekend I attempted (key word) to swap my 4spd out of 240 with my 5spd out of my 280. The unistall out of both cars went fairly quickly. I swapped out the rear diff. mounts and then washed both tranny's off.

At this point I swapped out the throwout bearings and throwout arm. The clutch pistons I left intact due to the aforemention swap.

After jacking the 5spd into posistion I fitted the engine and tranny together and bolted them together. I then bolted the rear crossmember in place. I tried to put the clutch piston in place and then noticed the initial problem. The throwout arm would not move at all. I then unbolted the whole unit and tried to seperate them. This was NOT happening. The tranny and engine would NOT seperate. I worked on it for 4 hours. I finally gave up and spent today taking it to a local tranny shop.

Any Suggestions? I know I will be out 150 to get it done, but I would like to know what I did wrong.

[CoastGuardZ]

Hey Sled,

Have absolutely no idea!:cross-eye

This looked a little important so I'm posting just to keep it bumped up on the list so hopefully someone can help.

Good Luck. Keep us posted.

Nate

[Mike]

Hey sled,

Do you remember which sleeve you used for the new throw-out bearing? There are different sizes and you should use the one made for the transmission you're installing.

Here's a link to a write-up about this issue done by Eric over at Zparts.com.

http://www.zparts.com/zptech/comparisons/pages/4tobear_specs1.html

Did you ever manage to get them apart again? This can be difficult sometimes.

[m]

[Zsled]

Funny, I just found this site and was doing the Homer DOOHHH! yell in my office!

I had swapped the throw out bearing between the 280 and 240 due to the sound of the bearing. I took the 240 throwout arm and the 280 throwout bearing and mated them to the 280 5spd. I then put this combo into my 240z!

No, I never got them apart. When I took it to the tranny shop here local, they gave me the WTF look and said some smart @$$ comment about you stick to your trade and we will stick to ours. If I had not been using them for years I would have taken it somewhere else.

[2ManyZs]

Is it possible you didn't get the clutch lined up exactly and it is now hanging up because of the angle of the input shaft into the pilot bearing? It's either that or it is hanging up in the throwout bearing as you possibly should have used the clutch arm from the 5 speed along with the 280 throw-out bearing. I'm not sure if the 240 and 280 arm are exactly the same or not. Did you double check the pilot bearing before you installed the trans? Perhaps the pilot bearing hanging up the input shaft......

Have had a few transmissions that needed a lot of "persuasion" but they were usually because the car had been sitting for a long time and the clutch disc splines had rusted fast to the input shaft.

The throwout bearing sleeve would probably not be causing the trans to hang up like it is. But without the right sleeve, the clutch actuation is not going to be right. You would either have no clutch actuation, or the clutch could be slipping all the time. Either way, make sure you use the correct sleeve.

[Zsled]

The verdict is in....

It was the throw out bearing! there is less than 2mm difference between the 72 to 75. The reason it wouldn't pull out after the initial stab was due to the angle of the tranny to motor. IT IS A MUST TO BLOCK THE MOTOR PRIOR TO PULLING THE TRANNY. If you fail to do this it will not allow you to pull the tranny back out.

With that said I am now going to try and tackle the install of the 4spd into the 75 where the 5pd came out of. Wish me luck!

[Zsled]

Ok, so today I got the balls to go at the tranny install on the 75' 280z. The 4spd came out of my 72' 240. This went almost flawless... It took 3 hours due to R&R ing the Intake and Exhaulst manifolds so i could get the tranny in. The exhuast has a header and it prevented the straight up motion of the jack. So this thing went pretty smoothly.

Now the fun part... This 75' is original and it has 547,000 documented miles on it. It is registered with Nissian and the only other Vehical registered with them is a 69 truck in AZ with 640,000 miles on it.

I have decided to sell it. Any Takers. I want to put all my time in the 240Z. I like the whole choke and vintage feel of the car.