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Old 11-26-2013, 07:27 AM   #15
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Originally Posted by SebasSF View Post
Hi Bob, I have a second cable, but it's for the cruise control.
Lockable-up torque converter eh? I had to read up on that one, and I think you are correct!
Now I wonder why it only kicks in at such a high speed, and how can I get it down to 55? I will see if a transmission shop can adjust it. I also read there are a couple sensors that can be cleaned and throttle position sensor calibrated.

The Powertrain Control Solutions Simple Shift TCU also looks like a good solution...
The lockup torque converter is controlled by the PROM in the ECM. I remember from the good old days, many torque converters were supposed to engage around 35 or so. If the PROM has been re-flashed, one of the things that is changed is the lockup point of the torque converter. If this has happened, it generally cannot be undone.
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Old 11-26-2013, 12:14 PM   #16
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I drive a 91 350LE quite regularly and it will cruise a 50 MPH in overdrive. If you have the 480 Transmission you do not have a speedometer cable.

However the easiest way to know is look at your gear selector it would have PRND321 with D being the overdrive postion. Also in overdrive you will be around 2100 RPM at 65 MPH if you are closer to 3000 then it is a 3 Speed.

I hope this helps.

Andrew T
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Old 11-26-2013, 07:03 PM   #17
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Hi Andrew, good point, and it looks like I have a three speed...crapola. So what do I have? I guess it has a lockup torque converter...
I will take some photos this weekend.
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Old 11-26-2013, 08:04 PM   #18
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The howling may be a bad/locked up fan clutch. If you do get a new one, get a thermal fan clutch.
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Old 11-27-2013, 02:11 AM   #19
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The 3 speeds did not originally come with a lock up torque convertor so unless the transmission has been changed I doubt you have one. Bob is likely correct that you have an over zealous fan clutch. It is normal for them to howl for the first couple of miles after a cold start and when climbing or in stop and go traffic but not all the time at highway speed.

We have changed a couple of 3 speeds over to the 480 with the lock up torque convertor and overdrive. The transmission just bolts in but you need an aftermarket computer module to manage it and another company makes a little motor that drives the speedometer for you.

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Old 11-27-2013, 06:41 AM   #20
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Interestingly, I used to work for a company that builds torque converters. One of my R&D projects was making a locking torque converter for the TH400/TH475. We discovered that locking the torque converter really didn't accomplish much except removing the ability of the engine to climb into a higher torque band under load, there was no significant saving in engine rpm or fuel consumption. I shelved the project, and we moved forward on making a better torque converter for the Ford E4OD used behind the 7.3 diesels, which at the time were suffering a higher than expected failure rate.
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Old 11-28-2013, 12:06 AM   #21
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Ok, so it looks like I have one of the following based on oil pan shape: TH375C, TH400, TH475, 3L80, 3L80HD. My carb has one cable plus cruise, and a throttle position sensor, and a cable speedometer. I guess there is a label on the side, but it's blocked so I can't see it. I found a screw to adjust the idle speed...much better now!
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Old 11-28-2013, 01:17 AM   #22
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I'm guessing 3L80HD...
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Old 11-28-2013, 12:58 PM   #23
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Thanks for clearing that up, I always wondered why they never put a Lock up in the 475.
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Old 12-07-2013, 11:30 PM   #24
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So I changed out my fan clutch today and went for a test drive...what a difference! Nice and quiet in all 3 gears. The job was a bit of a pain as the fan is encased in a shroud and you can only reach it through the doghouse. I removed the air filter, took out the four nuts holding the clutch to the motor with a wrench, then used a socket to take the fan bolts out. Slid the clutch out and reverse process. Hard on knees and back working over the motor. The old clutch was leaking fluid and clearly shot. Next purchase...Gear Vendors I think.

Thanks to everyone for the great information and advice... I'm really learning a lot!
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Old 12-08-2013, 06:23 AM   #25
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For not much more than the cost of the gear vendors you can change to the 4 speed transmisison with the lock up torque convertor. This will cut 400 RPM more out of your engine speed at 65 MPH and you get a new transmission at the same time. I am not sure if one of the new 6 speeds would fit but that would be slick if it did.

Just something to consider.

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Old 12-15-2013, 12:18 PM   #26
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I could replace the trans, bit it's fairly new. I also like the idea of a gear lower then 3rd but higher than 2nd for hose long highway hills. I did some crawling around yesterday, and found this Yellow info tag says Turbo Hydramatic FK 0131A, serial number 90 FKA 12348. I'm still not certain what I have...!
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