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Old 11-17-2005, 08:39 PM
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700-R4 Problem

You guys have been a great help in the past but I can't seem to find an answer to my problem. I have 700-R4 in my 1948 Ford F-1. The last time I raced it, I broke my rear end and transmission. I got the rear end fixed. My problem is the transmission. It drives fine in reverse and in 1st (It also has park and neutral). When it shifts from 1st to 2nd it is like I'm hitting the brakes, but I am not. I'm not sure what it is or could be. The fluid is still clean, no leaks, or funny smells came from it when it broke. If you guys have any ideas on what might be wrong, I would like to hear your thoughts. Thank you, I appreciate it.

hotrod48

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Old 11-18-2005, 06:25 PM
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when you have first gear is the shifter in D or in 1? Because reverse and 1 both have an extra clutch wich may still be good , but the clutch will only apply in R or 1 not 2, 3 or D.
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Old 11-18-2005, 07:13 PM
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When I took the truck for a test drive, it was in D. Later that night, I put the rear of the truck on jack stands. I put it in 1st and ran it to 1500 rpm and it was fine. I then shifted to 2nd and ran it to 2000 rpm. As soon as it hit 2000 rpm it jumped back and forth from 2000 to 1000 rpm. I understand this to be somewhat normal because there was no load on the transmission. Any more thoughts or opinions would be appreciated. Thank you ChevelleGuy for your comment, I appreciate it.

hotrod48
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Old 11-18-2005, 07:33 PM
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Hotrod48,

How did you adjust the Throttle Valve Cable? It could be an easy fix if you did not adjust this cable correctly.

Good Luck
Scholman
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Old 11-18-2005, 07:42 PM
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I adjusted the throttle valve cable when I installed the transmission. That was about a year and a half ago and it has been operating fine. Thank you.

hotrod48
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Old 11-21-2005, 08:23 PM
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I have been told that a sprag gear could have broke. Is this a possibility? This may sound dumb, but could the servo cause this? I'm not sure on any of this, but I'm learning. Thanks for the help.

hotrod48
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Old 11-22-2005, 06:45 PM
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several things can be wrong.

The 1-2 accumilator could be leaking past the piston.

The 2-4 servo may have a cut seal or miss installed one leaking pressure off to where it should not be.

The RPM's jumping up and down while on jack stands should not happen.
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Old 11-22-2005, 07:00 PM
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Crosley, thanks for the help. Do you think my torque converter is gone? To fix the 1-2 accumulator, would that just be a new seal? The trans was built by a shop, so I assume the servo was installed correctly to have lasted this long.

When I broke my trans and rear end, I feel that the shock of the rear end breaking caused something in the trans to go. Does this sound right or could cause one of the problems you listed?

I hope to drop the trans this weekend (This depends on my dad's schedule too). There is a slim possibility that it could be disassembled too (Very slight chance). Thank you and I appreciate the help. Any more is also greatly appreciated.

hotrod48
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