8hp70 tcm?

[Lee Peterson]

I just swapped my trans and I checked system log of TCM and it already list original vin which was the wrecker vin and current as my vin. I didn't even program it.

 

[04fxdwgi]

Hello! Im swapping a 2019 845re in my 2016 ram. Did you enter the vin # in capital letters or does it matter? Thanks!

Not so sure about the TCM in particular, but AlfaOBD specifically states " all CAPS " when doing the other VIN entries I have seen.

 

[Beaniam]

So what is the general consensus? If a valve body/TCM are swapped from a similar year ram it does not require cloning? The sleeve connector on my zf8 in my 16 ram somehow got water in it and corroded, broke one pin off in truck side harness. So I'm looking at replacing the TCM now since the damn connector is on that. I do have alfaobd but haven't hunted around in the TCM section.

 

[Sherman Bird]

Well I'm at my wits with this unit. I found a unit with under 1000 miles on it I may go pick up. My question is do I have to swap my TCM into the new trans?
with my unit No matter what I do it won't shift right. I've had the pan down more times than I care to remember and have thrown away hundreds on fluid. Few hours ago I deleted the revmax kit and gave it a belly full of maxlife. Trans holds a steady 165-170 now but its never felt so bad. Shifts either flare or delay. When it does shift it feels like the trans in full of mash potatoes. I'm leaving the battery disconnected till around noon tomorrow. Maybe it'll relearn

I know that it is human nature to deny the gawdawful truth sometimes, especially when it involves large sums of moola.

You have exhausted more avenues of correction than the average Joe. If you are REALLY going to install a USED unit, then bless you. I do not know how much difference the cost of that used one is from the cost of a Jasper unit, heck, I do not even know IF Jasper even HAS one or will rebuild your unit.

"Under a thousand dollars"... "It ran when it was parked"... cute catch phrases to part you with more money that simply stating that it is used, germane to it's TRUE used value.

YES you DO have to reprogram the TCM. Period. That is the least of your problem.

Are you planning the R&R operation to be done by yourself? If so, have you considered replacing, as opposed to flushing the cooler?

As an Automatic Transmission Specialist, I CAN tell you rather accurately, that flushing is Russian Roulette.... plain and simple. Debris can get packed into nooks and crannies of the cooler, and then get dislodged later, only to decimate your expensive efforts.

When I repair automatic transmissions these days, when the cooler is part of the radiator, ALL of the units I either replace or rebuild get a new radiator. I tell the customer that they are killing 2 birds with one stone in that the cooling system is also being brought up to snuff; optimal function.

The external type cooler is a no-brainer.

 

[Wild one]

I know that it is human nature to deny the gawdawful truth sometimes, especially when it involves large sums of moola.

You have exhausted more avenues of correction than the average Joe. If you are REALLY going to install a USED unit, then bless you. I do not know how much difference the cost of that used one is from the cost of a Jasper unit, heck, I do not even know IF Jasper even HAS one or will rebuild your unit.

"Under a thousand dollars"... "It ran when it was parked"... cute catch phrases to part you with more money that simply stating that it is used, germane to it's TRUE used value.

YES you DO have to reprogram the TCM. Period. That is the least of your problem.

Are you planning the R&R operation to be done by yourself? If so, have you considered replacing, as opposed to flushing the cooler?

As an Automatic Transmission Specialist, I CAN tell you rather accurately, that flushing is Russian Roulette.... plain and simple. Debris can get packed into nooks and crannies of the cooler, and then get dislodged later, only to decimate your expensive efforts.

When I repair automatic transmissions these days, when the cooler is part of the radiator, ALL of the units I either replace or rebuild get a new radiator. I tell the customer that they are killing 2 birds with one stone in that the cooling system is also being brought up to snuff; optimal function.

The external type cooler is a no-brainer.

The cooler is part of the A/C condensor,so replacing it,isn't exactly cheap or easy for a DIY'er. Anything newer then 13 uses the gold plated 1234rf refrigerant ,so he'd have to find some place that would recover and store it till he had the job done.

 

[Sherman Bird]

The cooler is part of the A/C condensor,so replacing it,isn't exactly cheap or easy for a DIY'er. Anything newer then 13 uses the gold plated 1234rf refrigerant ,so he'd have to find some place that would recover and store it till he had the job done.

Yeah, that IS one downside I've seen on newer vehicles! However, it doesn't change the debris getting stuck issue. The only other option, comes to mind, is an in-line trans cooler filter with an internal magnet. ATP makes them. It requires cutting and plumbing the return line. Ford used to include an inline filter with every FQR (Ford Quality Reman) transmission. This filter was specific in it's instruction that it was only an auxiliary device, and that thorough flushing was required, too. I just got tired of comebacks from debris which still managed to get past these precautions. As the owner of my OWN shop, I've had 100% success in never having re-checks by adopting the supreme dogma of "always replace the cooler"!

And, as you said, 1234yf IS stupid expensive!