2005 Toyota Tacoma trans slipp

Before you do anything else, unplug the transmission connector on driver's side and inspect for corroded pins. Notorious… and I mean notorious for corrosion.

They are also notorious for torque shudder as well. As least the handful Ive seen down this way in Florida. Not saying having ever done this but Ford FRiction modifier works great in most trans applications unless there is a software update to change the shift points but by that time its too late and replacement of converter or trans is a sure thing. Make sure your SLU pid isnt tweaking hard…

AFTER - eliminating everything else… if you're sure that you have a clutch pack that is starting to slip, you can try draining 2 quarts of the WS and adding back in 2 quarts of Type F transmission fluid. Type F contains no friction modifiers and will let the clutches grab harder with less slippage. Clear the memory and shift points etc. Start with 2 quarts and release it to the customer. If…

My personal experience is that only WS works. We have even had problems with good branded “universal” types that said they were WS compliant. You need the right friction modifiers for the partial TCC modes (when it shudders due to fluid degradation). If fluid renewal does not cure shudders at those times, it is torque converter time. Maybe Honda DW-1 would be okay, but at that rate, might as…

thanks fellas for this. I had not inspected the connector so I'll hope that maybe that's the culprit. As far as I know, this truck has only had WS put into it (which is also what I used). I do wonder about torque shudder as the main problem. I'll get the truck back and see.

Jon, why not just add a bottle of Lubegard friction modifier or shudder fix? I've had good luck with their products plus it's a lot easier to do.

Hey Cmore - I think the complaint is for a slip as I understand it?? Not a shudder? I think the Lubegard adds more friction modifiers? The Type F fluid doesn't contain any modifiers so it combats slippage but can cause harsh shifts if its not used correctly. My suggestion is only for an aging transmission that has minor slippage. We were actually taught this at the factory Toyota school in…

Interesting. I always thought Type-F was a high friction fluid. We used to use it in GMs to get a firmer shift. Thought the friction helped “bite” the clutches instead of slipping. As far as downvoting, wasn't me. I looked up a few different brands of type-f, Mobil says “used in transmissions designed for a high-friction fluid”, Motorcraft says “It's a high-static friction fluid”. Am I…

Type F, which is pretty obsolete now, was just a bit thicker when cold as compared to the early Dexron. Once it is warm, same results as Dexron. We used Dexron II in all of them back in the early 70's with no issues we ever saw or heard of. Those transmissions pretty much all used the same friction materials and steel clutches. Pumps were all internal gear (crescent type). Using Type F would…

They were the older GM 3 speed transmissions that would get a soft/slipping 1-2 shift. Adding 5 or 6 quarts of type F would firm up the 1-2 shift and a careful driver could get a year or two more driving out of it. If you drove it too long with the slipping 1-2 shift and let it turn into a big shift flare instead of a slip then the type F fluid wouldn't help.

You are correct - it lacks the modifiers that cause the clutch packs to slip. The Type F will make the clutch packs grab sooner and firmer. The other fluids have friction modifiers that cause the clutch pack to slip a little (by design) to avoid harsh shifts.

The shift overlap (smooth shifts=slipping) in those old technology transmissions forced slip to occur on the clutch packs, The friction materials were much different then. The early Fords (up to around 1965) used bronze against steel which was a far different friction coefficient than the materials used today. The shift times were also much slower overall for most of them. Those units were not…

This was actually taught in Toyota MDT school in Irvine - for anyone that downvoted it - just FYI

I used to use that good old type F years ago to help a slipping GM transmission, you could get a year or two more use out of those old cars unless you were hard on it.

I guess its just us old guys… that post was down voted a few times - if you understand transmission operation then you get it…

Most people think of transmissions like they think of a computer, a magic object that is impossible to understand. I mean really, what can a sun and planets have to do with a computer? How can a sprag clutch work in a transmission, it only turns freely in one direction and locks up in the other direction, how can you get reverse with a sprag clutch?

Eric, you reminded me of my complaint when people say “internal problem” when talking of transmissions. You are correct, they are not impossible or magic. One of my friends used to call them “AutoMagic transmissions” LOL Internal problem does say they may not have a good idea about what is failed or failing. Hence how would they really know if some additive would make the difference? We would…

Don't get me started about Honda (and some Ford) transmissions that are supposed to be of the “Automatic” variety. I learned on the good old transmission from the 60's, 70's and 80's. I've kept up to date on most of the newer, at least up to 2015, transmissions. Now they just tax my brain, at least the basics are still the same!

Probably one of the greatest inventions was the planetary gear set.

Did you open the thermostat before you did the final level check? If not, it is underfilled. Likely this not the cause of slippage, but it should be correct.

I doubt the fluid type is the problem for a slip condition. More likely there is some old age made worse with leaking lines and low fluid conditions. The suggestion Marlin makes of rechecking the fluid level is also a very good one. Don't give Mr. Customer too much hope.

I don’t know what you mean by a slow dribble but any slow dribble out of the over flow to me is under filled. I check them around 113 degrees Fahrenheit at the trans temp sensor and I look for a constant flow about the thickness of a pencil. I think you need atleast another quart if not 2 and then drive it. I have fixed many so called shudders bunch adding the correct amount of fluid and ones I…

Thanks Brian.. dribble is probably not the right word - stream would be better. I'm getting this truck back on Saturday and will reconfirm proper fluid level. I appreciate your help!

Good luck. If they still had dipsticks - things would be so much simpler.