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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Slave Cylinder ????

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Old Aug 28, 2007 | 01:36 AM
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Slave Cylinder ????

Does anybody know the difference between lets say a '89 F150 and '94 F150 slave cylinders? What I'm doing is, got a '89 4.9l m5r2 4x4 parts truck, putting everything into a '94 4.9l e4ode 2wd. I'm not sure which slave cylinder to buy. I'm gonna use a '94 clutch master and line, but not sure if it will connect to the '89 slave. So, I guess the question is, can I use a '94 slave cylinder on a '89 transmission?
 
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Old Aug 28, 2007 | 07:50 AM
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The slave cylinders should be pretty much the same. Check on some parts store websites to compare part numbers, sizes, etc. I know NAPA's website lists master cylinder bore size, and from the years I've checked, they seem to remain the same, and the hydraulic lines usually will interchange as well. Just check some part numbers to see what's the same and what's different, but from what I've seen, you will probably be fine using the 94 master and hydraulic line with the 89 slave (shoot the 94 slave will probably work fine too since the transmissions are the same).
 
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Old Aug 28, 2007 | 02:11 PM
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I checked a couple parts store sites and the '89 bore size is 1 1/32" and the '94 is 1.875". When I look up the input shafts on tranny rebuild sites, they have the same input shaft. So I think I will just get a '89 slave and try a '94 master and line. Thanks
 
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Old Aug 29, 2007 | 08:28 AM
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NAPA lists an 18mm bore size on the 94 master (7/8" for the 89 master), and the slave cylinders are different part numbers. If you can compare both the slave cylinders (94 and 89) side by side and they match up length-wise, I would use the 94 slave if you use the 94 master, since it is a different size than the 89 master. You may also be able to use a slightly older master cylinder and hydraulic line (from a '92), with the 89 slave, if the master cylinder mounting flange bolt pattern matches up to the 94 firewall (which it looks like it does on NAPA's website).
 
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Old Aug 29, 2007 | 01:59 PM
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Well I do now know that the 94 line won't work in the 89 slave. So I guess I'll go buy a 94 slave and find out the difference. Let you know, thanks for the help.
 
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Old Aug 29, 2007 | 03:52 PM
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Do you already have the 94 line and master?
 
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Old Aug 30, 2007 | 01:44 AM
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Yeah today I bought the 89 slave, 94 master and hose. I was trying to make it look model year correct, with the correct clutch master.
 
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Old Aug 30, 2007 | 08:45 AM
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Ah, I see. Let us know how that 89 slave works with the smaller bore master cylinder.
 
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