tranny issue out of o/d - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 11 (permalink) Old 03-06-2019, 06:39 PM Thread Starter
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tranny issue out of o/d

2001 F-250 diesel with 196 k miles. For about 13 years I have had an aftermarket exhaust brake that allowed me to selectively lock and unlock the TC to provide braking down to 22 mph. It also closed the exhaust warm up valve to give some more back pressure. I tow a 10 k fiver with a lot of mountain time. Recently it started dropping the rpm to idle when down shifting from overdrive. It indicates TC locked (indicator light on) but it is just coasting. I have now removed the exhaust brake and it still does the same. In overdrive at highway speeds the rpm tracks the truck speed. When I down shift using the button on the shift lever, the rpm drops to idle and the truck coasts (power pedal at idle). The factory re-man tranny is less than a year old. Any ideas what is going on? Thanks, Bill

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #2 of 11 (permalink) Old 03-06-2019, 08:20 PM
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Yes, I know what's happening. Your coast clutch is not engaging.

What happens at 40 MPH if you coast and move the shift handle to 2?

Mark
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post #3 of 11 (permalink) Old 03-07-2019, 09:09 AM Thread Starter
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Thanks Mark. I have been off the forum for a while. Glad to see you are still here and giving tranny answers.

I have not driven it this morning to check second gear, but am wondering if that sounds like a mechanical or programming issue. I ask because I just read my receipt from Rich Ford in Albuquerque and it says no warranty due to aftermarket equipment. I am so p*ssed! The last thing I confirmed with the service adviser was that I had a full 3 year warranty. I live in Arizona so hard to take it to them. I absolutely would not have left it on had I been advised. Service manger remembers differently of course. Anyway, any chance it is an easy fix?

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #4 of 11 (permalink) Old 03-07-2019, 02:38 PM Thread Starter
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Hi Mark. 40 and 45 mph shift to 2nd and the rpm drops to idle! Rpm usually linked to speed a little above 40 on my truck. about 43 I think, so I did both speeds. Talked with the service rep and he of course does not remember. Understandable with so many customers, But my last word with him were his confirming again that I had a 3 year warranty. Bummer! I did not read the folded service copy he handed me. Bill

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #5 of 11 (permalink) Old 03-07-2019, 03:01 PM
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Im with Mark, since exhaust brakes are known to break the coast clutch. Also, you can only have one exhaust brake functioning at a time. Unless you have true dual exhaust which you don't. Meaning, your EBPV is first in line, and you say it is used as a brake as well, so its taking all the pounding. The second one is doing nothing. They can't combine forces. The EBPV system works, but its not designed for that, and could fail. Your better off removing that programing so the EBPV works as normal, and go with the actual exhaust brake.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
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post #6 of 11 (permalink) Old 03-07-2019, 06:40 PM
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Originally Posted by Voodoo View Post
Hi Mark. 40 and 45 mph shift to 2nd and the rpm drops to idle!
That eliminates anything simple. The coast clutch has failed. The trans needs to come out to fix this.

If it held during this test that would prove that the coast clutch works, but the solenoid wasn't working. The coast clutch is applied hydraulically without using the solenoid with the shift handle in 2.

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post #7 of 11 (permalink) Old 03-08-2019, 02:58 PM Thread Starter
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Thanks Mark. I appreciate the expertise you bring to the forum. I'll be taking it in next week. Closed. Bill
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01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #8 of 11 (permalink) Old 03-28-2019, 08:41 AM Thread Starter
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Well I'm screwed and out $4300. I had the tranny replaced on the road at Rich Ford in ABQ last summer. The tech told my service rep the exhaust brake needed to come off. The rep "assumed" I wanted it left on but did not ask me. I discovered this while checking out after hours and expressed my displeasure. No mention of no warranty. I asked for a copy of my warranty and was repeatedly assured that I was fully covered with my receipt. I wasn't. It was late and I put the folded receipt in my glove box and only saw the disclaimer when retrieving it for this problem. I would never have knowingly accepted the truck without warranty at that cost. I am still trying to get relief but it looks grim. Just wanted to share my frustration. I don't see legal action as an option as it would cost more than the tranny.

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #9 of 11 (permalink) Old 03-31-2019, 10:40 AM
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That's sad, I feel for you. In the future, if stock, make sure that exhaust brake has a regulator on it , and a gauge, like the BD system. You can control the hold with that. They recommend regulating no more than 45 psi if stock. That actually holds ok without burning up the coast clutch. With an HD tranny with the clutch upgrade you can pile 80psi in there. You get a whole lot of hold with that, and sounds like a semi with a real engine brake. Or take it off, you don't need it anyway. Truck hauls its limit fine without one.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
1999 Mustang GT Convertible Anniversary, rare stock electric green
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post #10 of 11 (permalink) Old 04-04-2019, 01:36 PM Thread Starter
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problem solved - repaired under warranty

It took a lot of calls and emails but I am finally getting repaired under warranty. As per Magnusam Moss act the presence of non- OEM items do not void a warranty. They must show the item actually caused a failure. My previous tranny had 130 k on it and 90 k with the TC controller installed. And the coast clutch was still working fine when I replaced that tranny. Technicians and the warranty rep at a local dealer cleared it. Should not have had to fight this but it came out ok. Life is good!

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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post #11 of 11 (permalink) Old 04-08-2019, 02:35 PM Thread Starter
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They finally opened my tranny and it had been assembled incorrectly by the Ford factory reman facility. A coast clutch bracket was installed wrong.

01 F-250 PSD, XLT super cab, automatic, 3.73 limited slip, oxford white, Isspro (3) guages, Line-x. Stock. Towing a 2001 MobileScout 30RKS fiver (9600#).
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