Howdy all,

Long story short I'm going to install a slave cylinder for an isuzu trans on my muncie 5-speed. I've removed the studs and drilled out the holes, my only question is which slave cyl pushrod do I use? The Isuzu one which is 5 7/8" long or the muncie one that is 3" and something? I've searched and found threads where members are using the isuzu slave on the muncie 5-speed but couldn't figure out which pusrod to use.

Thanks guys!

It seems to me that you have to use the Isuzu push rod, or the starting position for the clutch lever will be wrong. The Isuzu slave provides for more travel, so it is possible that as you depress the clutch pedal you can go beyond the normal position that the getrag (muncie 5 speed) would expect.

[This message has been edited by Gall757 (edited 10-24-2011).]

I have always used the Getrag's pushrod. If the rubber boot is still good reuse it too. If it's bad, it's okay to use the new one. It doesn't fit as well over the Getrag push rod but it will work.

If you have the Isuzu pushrod and it is longer, use it.
The reason for using the longer push rod is so that the slave's piston is farther back into the bore of the slave. If you use a shorter rod the piston might reach the end of the slave before the clutch disengages.
Then you eather blow up the slave's seals, the hydraulic hose, the seals in the master or maybe even snap the master's banjo rod in half.

[This message has been edited by 2002z28ssconv (edited 10-25-2011).]

This thread is already confusing enough, so its a good idea to make some clarifications.

----------------Transmission types

quote Taken directly from Calgary Fiero's MG2 -- 5-SPEED MANUAL -- GETRAG -- 3.61 RATIO -- V6 ONLY MT2 -- 5-SPEED MANUAL -- ISUZU -- 3.35 RATIO -- L4 ONLY MY8 -- 4-SPEED MANUAL -- MUNCIE -- 3.32 RATIO -- 1984 L4 ONLY M17 -- 4-SPEED MANUAL -- MUNCIE -- 3.65 RATIO -- V6 ONLY M19 -- 4-SPEED MANUAL -- MUNCIE -- 4.10 RATIO -- 1984 L4 ONLY Note: MG2 is the Getrag-designed Muncie built transaxle

What I'm able to gather from what King has posted, is that he is using the slave cylinder from the Isuzu (MT2) for his Getrag (MG2). He's calling his Getrag a Muncie, which is ok because Muncie built the transmission, even though it was designed by Getrag. He's asking which pushrod to use. There's a bigger problem. The slave cylinder used on the Getrag (MG2) is different from all others. The bore is larger, and the piston does not travel as far as say the piston from the Isuzu. The slave from the Isuzu uses a smaller bore and the piston travels a great deal farther. So if you use the Isuzu slave on the Getrag/Muncie 5 speed, you will over extend the throwout bearing, and possibly destroy the pressure plate.

The Isuzu (MT2) and Muncie 4 Speed (M19) share the same slave, but use a different pushrod. So if there is a typo, and King is talking about the Muncie 4 speed, using the Isuzu slave will be alright. Otherwise, beware.

I had a slave cylinder for the Isuzu 5-spd on my Getrag for awhile. I didn't like it, because it made the clutch pedal very stiff. Driving in traffic was torture (my leg actually cramped up once).

Anyway, I used the Isuzu pushrod with the Isuzu slave cylinder. The shorter (Getrag) one wouldn't allow full clutch disengagement.

[This message has been edited by Blacktree (edited 10-25-2011).]

How many different pushrods are there? I know of only 2....as posted by King.....

Blacktree says the short one won't work...so that leaves the long one.

This thread really is confusing, so I would suggest that you get one of Rodney's Getrag slaves for your Getrag, and one of his Isuzu slaves for your Isuzu. His slaves come with the proper rod and boot. And they work well, so you don't have to use the wrong slave for your transmission.

quote Originally posted by Blacktree: I had a slave cylinder for the Isuzu 5-spd on my Getrag for awhile. I didn't like it, because it made the clutch pedal very stiff. Driving in traffic was torture (my leg actually cramped up once). Anyway, I used the Getrag pushrod with the Isuzu slave cylinder. With the shorter pushrod, I couldn't get full clutch disengagement.

I'm confused. You say that you used the Getrag pushrod but then you say the short one didn't work. The getrag pushrod is the short one....The Isuzu one is the longer one.

Sorry for the confusion. I really shouldn't post stuff before my second cup of coffee. My previous post has been edited for correction.

I was under the impression that the Isuzu's rod was shorter. But I trust Blacktree's knowledge enough to edit my previous comment.

Regardless, do you have both rods? If so, use the longer of the two. Since none of the Isuzu slaves I have ever bought came with a new rod, I have always used the Getrag's rod without issue.

I always replace the getrag cyl with the isuzu one. Never had any problems, other that more leg effort required. You soon become use to this. Much cheaper, can use the double seal rebuild kit.