Quote:
Originally Posted by travisunderwood
One last question.
'On the computer code issue, should I be worried about the shifting strategy differences you mentioned?
Generally not. There are just some shifting characteristics that are often less desirable. For example, some calibrations don't lock the converter in 2nd gear or won't lock the converter in 4th at full throttle. It's not a problem, per se, but just an annoyance for some folks"
Excuse my ignorance, what is meant the converter is not locked in 2nd or 4th?
Thanks
Travis
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Travis,
To get a little more in depth with this question of yours:
Ford had a
ton of different calibrations for the 7.3L powerstrokes. Each progressive code had something changed, be it one characteristic or a dozen. The changes weren't usually something that manual transmission truck owners would notice because there is no transmission shifting strategy required (the driver actually determines how the truck shifts instead of the PCM).
A lot of times, the Ford engineers actually built calibrations that didn't "make sense" to people who like to use and drive their trucks. My favorite example is my brother's truck (which shifts like a lot of other trucks out there) that has an MRT2 PCM code. It will not, under any circumstances, command a torque converter clutch apply in 2nd gear or at any usable speed in 3rd gear. It totally wastes all engine torque until the 3-4 shift at 45-50 MPH at which point it goes from a 3rd/unlocked to a 4th/locked.
Any time the engine loses RPM like that, all boost is lost. Acceleration suffers and it's just really frustrating to drive. A lot of other PCM codes do things like keep the torque converter clutch applied on deceleration but only for 13 seconds (MNM0, NVK2, etc.) or until the brake pedal is depressed (just about every 95-97 truck except TDE1/LKM6). Those don't make much sense either.
I see you have a 99. Is that an early 99 (build date of pre-8/98) or a 99.5 (9/98 or newer)? There are a ton of possibilities for your truck no matter which you have, but there are some pretty substantial differences between the two different model years.