Built tranny going bad - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 81 (permalink) Old 07-03-2009, 12:48 AM Thread Starter
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Angry Built tranny going bad

Well my tranny is clearly slipping at high speeds. Tonight I was going about 70mph in OD accelerating fairly hard and the RPM's clearly rev'd and the tranny felt disconnected from the engine. I let out of the throttle and it was fine.

If you drive normal the tranny is perfect, and even from a stop under hard acceleration it's solid. When driving at high speed under hard acceleration it's slipping. In Drag_3B it shutters off the line, and you can feel it, but no other tunes do this.

Is this a torque converter issue, or something else?

The tranny has never been overheated, it usually runs around 130-170 depending on the outside temperature. Shifts are firm and strong, torque converter lock-up is strong..... only slips at high speed in my hot tunes under hard acceleration.

Tranny has 30k miles on it since rebuild by a very good trans builder here called Mass Diesel Performance. I need to call them in the morning to pick Scott's brain, but I want to hear what you guys think.

Please help me, I don't know what components are slipping.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
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post #2 of 81 (permalink) Old 07-03-2009, 02:18 AM
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Re: Built tranny going bad

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Originally Posted by PSDfan99 View Post
Well my tranny is clearly slipping at high speeds. Tonight I was going about 70mph in OD accelerating fairly hard and the RPM's clearly rev'd and the tranny felt disconnected from the engine. I let out of the throttle and it was fine.

If you drive normal the tranny is perfect, and even from a stop under hard acceleration it's solid. When driving at high speed under hard acceleration it's slipping. In Drag_3B it shutters off the line, and you can feel it, but no other tunes do this.

Is this a torque converter issue, or something else?

The tranny has never been overheated, it usually runs around 130-170 depending on the outside temperature. Shifts are firm and strong, torque converter lock-up is strong..... only slips at high speed in my hot tunes under hard acceleration.

Tranny has 30k miles on it since rebuild by a very good trans builder here called Mass Diesel Performance. I need to call them in the morning to pick Scott's brain, but I want to hear what you guys think.

Please help me, I don't know what components are slipping.

Prolly the converter slipping

2005 F-350
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post #3 of 81 (permalink) Old 07-03-2009, 06:10 AM Thread Starter
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Re: Built tranny going bad

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Prolly the converter slipping
Thanks Tony. I suspect the converter, but I'm not sure because transmission issues are something I've never really had to diagnose or repair. This tranny has been awesome for the past 30k, until I added all this new power (injectors and turbo).

I'm going to call Mass Diesel at 8:30am and see what Scott thinks and maybe take a test drive.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
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post #4 of 81 (permalink) Old 07-03-2009, 06:23 AM
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Re: Built tranny going bad

its probably the converter... IMHO the ATS extreme converter would be the upgrade I would do..


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post #5 of 81 (permalink) Old 07-03-2009, 06:28 AM Thread Starter
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Re: Built tranny going bad

I took the truck about 60 miles into Boston and back tonight to get the GF at the air port and the truck shifts, drives, and runs beautiful if you're not in a hot setting on the chip and trying to do a speed run. Normal driving it's perfect, at WOT or very hard acceleration in OD, when the boost builds you can feel the slip.... let out and its fine.

As for converter upgrades... I want the best for my application, or darn close to the best. Currently I'm running a single disc DTT converter.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
SOLD
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post #6 of 81 (permalink) Old 07-03-2009, 12:11 PM
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Re: Built tranny going bad

I would do line pressure tests in the different settings first.
The single disk really does not have alot of surface area and holding power.

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Bill

97 Quigley 4X4 PSD
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post #7 of 81 (permalink) Old 07-03-2009, 12:13 PM
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Re: Built tranny going bad

Jake, i didn't know that it was a single disc converter, im not surprised that it is coming part


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post #8 of 81 (permalink) Old 07-03-2009, 01:50 PM
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Re: Built tranny going bad

You need to get a PI tripple disc in there before you take out you trans!

97 F-250 CC 350/200's, Intercooler, Billet S468, T-4 mount, BTS trans, Irate Electric Fuel, BTS Dual Pumps, Water Meth, NOS, ARP studs, Comp 910 springs, Gearhead tuning.

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post #9 of 81 (permalink) Old 07-03-2009, 02:54 PM Thread Starter
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Re: Built tranny going bad

Ok, so the overall consensus is that the TCC is the problem? Just want to be sure of that before spend any money on a PI.

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
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post #10 of 81 (permalink) Old 07-03-2009, 04:34 PM Thread Starter
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Re: Built tranny going bad

Ok, I just went for a drive with the scan tool and watched the TCC lock up % to see if it was doing the slipping or if it was something else. The TCC lock never slipped. It stayed at 100% from the point of lock up even through the "slipping". I talked to my tranny guy and he said the best way to check a slipping TCC is to watch the % of lock up when the slipping occurs... so I did and it held 100% the entire time.

What do I do next?

Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
SOLD
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