6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. 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 6.4L Power Stroke engine.
I am wondering what ya'll think about the torque shift's torque converter on these 08s. I love this truck but am having a hard time getting used to reving it to 2500 rpms to really feel like it is moving. I sold a 99 dodge cummins which I had put an after-market torque converter in with a much tighter fluid coupling than the stock slush box. It was great, 2000 rpms would set you back in the seat (and yes it had bigger injectors and a fueling box but the combo only gave the the HP and torque that the new 08 claims (350 hp, 650 lb torque). It seems to me like this is a factor (too loose a fluid coupling) in the poor mpg on these 08 Fords in city driving. I know the dpf is hurting mpgs more than anything. But I think with a tighter fluid coupling on the TC mpgs would better in city driving (won't make any difference on the hwy). This transmission is light years better than previous ones (like a stock 99 dodge) but with all the engineering which have gone into them to make them better, I'm scratching my head why they did put a better TC in them.
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2008 F250 6.4L Diesel 4x4 CC Long Bed King Ranch 20" Wheels
Sold 99 Dodge 2500 CTD 4x4 QC Long Bed, Edge EZ, 275 HP injectors, Goerend Torque converter
I read that the torque converter was improved, along with other components in the trans.
Yes, I think it is. But my point is that my truck is bone stock, no tuner etc. The stated peak torque is acheived at 2000 rpm and Hp at 3000 rpm. I would guess this what people refer to as the power band in this truck. When I mash the throttle, I can run the rpms up to 3200 in no time. This means I am losing power to the ground becuase of the TC not transferring all that power and torque from the engine to the ground. Its being lost in the tranmission. The reason I know this is when the TC locks up, you instantly lose 500 rpms. If it had a tight fluid coupling, you wouldn't lose more than 2-300.
Anybody out there using an aftermarket TC? Maybe I'm just stuck in my old cummins mindset where I wanted the TC to really start "hooking up" around 1700 rpms
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2008 F250 6.4L Diesel 4x4 CC Long Bed King Ranch 20" Wheels
Sold 99 Dodge 2500 CTD 4x4 QC Long Bed, Edge EZ, 275 HP injectors, Goerend Torque converter
I am wondering what ya'll think about the torque shift's torque converter on these 08s. I love this truck but am having a hard time getting used to reving it to 2500 rpms to really feel like it is moving. I sold a 99 dodge cummins which I had put an after-market torque converter in with a much tighter fluid coupling than the stock slush box. It was great, 2000 rpms would set you back in the seat (and yes it had bigger injectors and a fueling box but the combo only gave the the HP and torque that the new 08 claims (350 hp, 650 lb torque). It seems to me like this is a factor (too loose a fluid coupling) in the poor mpg on these 08 Fords in city driving. I know the dpf is hurting mpgs more than anything. But I think with a tighter fluid coupling on the TC mpgs would better in city driving (won't make any difference on the hwy). This transmission is light years better than previous ones (like a stock 99 dodge) but with all the engineering which have gone into them to make them better, I'm scratching my head why they did put a better TC in them.
I know Dave (Goerend) came out w/ a T/C for the Dodge 6.7 and said it improved mileage by 2 mpg because it was tighter than what came on the stocker. So it's possible for a reputable tranny builder for the Ford trucks to come out w/ one for the Torque Shift tranny. You should call around and see what's out there (I don't know what's good out there for Ford tranny builders).
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but am having a hard time getting used to reving it to 2500 rpms to really feel like it is moving. I sold a 99 dodge cummins which I had put an after-market torque converter in with a much tighter fluid coupling than the stock slush box. It was great, 2000 rpms would set you back in the seat (and yes it had bigger injectors and a fueling box but the combo only gave the the HP and torque that the new 08 claims (350 hp, 650 lb torque). It seems to me like this is a factor (too loose a fluid coupling) in the poor mpg on these 08 Fords in city driving. I know the dpf is hurting mpgs more than anything. But I think with a tighter fluid coupling on the TC mpgs would better in city driving (won't make any difference on the hwy). This transmission is light years better than previous ones (like a stock 99 dodge) but with all the engineering which have gone into them to make them better, I'm scratching my head why they did put a better TC in them. 
2008 F450 DRW CC LWB 4x4 Off Road, Lariat, Oxford White, 4.30 LS rear end, Navigation, audiophile stereo, Memory package seats, heated seats, heated mirrors, warmup heat option, power back window, traction control system, backup alarm, rear DVD with wireless headphones. 
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