i have a th200-4r installed in my car.
i noticed that it started to leak oil from the pan so i am going to drop the pan and replace the gasket and the filter. i was thinking while i am in there to try and mess with the governer somewhat to change WOT shift points. currently it is shifting at about 3000-32000 rpm at WOT. i can shift manually where i want and i have an rpm limiter installed to 5000rpm. (usually the engine comes a live at 3500 to 4000 ish rpm to 5000 rpm)
how can i change it that it will shift a bit higher at WOT. it doesn't have to shift at 5000. but at 4000 will be fine for me.

i read that removing the spring from the larger weight can do the trick?
or grinding down the weights? i don't really want to do that because if it gets damaged or something it will be hard to replace in Europe

thanks in advance for the advice!

 

I never removed a spring, though tension of springs can be varied. When I tune 200 govs, the first thing I do is get a second gov and have a scale of the proper range that reads to at least tenths of a gram. Well, actually the first thing is to install a drain plug in the pan if one is not present, this is a trial & error process and no need to fight messes from errant fluid. ATF can be drained into a container rather than wasted, especially if pricey synthetic. Next is to “pin” the spring on the smaller weight with a plastic screw (for minimal weight), likely 8-32 (3-4mm), I can’t remember. This is so spring cannot fly out, as can happen under certain operating conditions.

Weigh the existing weights and RECORD, then match the second gov’s weights. Put one of the govs back in, road test, record results and make appropriate adjustments to “the other” gov, by drilling holes and/ or grinding off material. Don’t go nuts, take a little weight off, use some judgement and instinct. RECORD THE NEW WEIGHTS. Swap the govs, road test, record results, if changes are due, rinse & repeat.

I have had some pretty thin, Swiss Cheese looking weights in some applications. Rule of thumb - It’s easier to remove weight, than to add it back on.

This process is also the time to get speedo properly calibrated via gear changes if it is necessary.

Now that I remembered you are in Europe, maybe you could forego the second governor. It’s for expedience and convenience. Also a fall back if you overdue the material material on the other weights. So, it’s good to use 2, but not mandatory.

​​​​​​….

 

It’s been along time since I messed with one of those transmissions. I seem to recall reading that’s it’s very difficult to get higher rom shift points with the common “civilian” valve body’s. I’m not sure how much you are hoping to raise them, but it might be worth contacting a 200R4 specialist before digging too deep into the project.

 

I removed the spring and milled about 150 thousandths off the top and put a stiffer TV Limit spring in and my 1-2 is ~5500 rpm and my 2-3 is a bit lower.

This is on a lowly diesel valve body too.

 

i am hoping to raise the rpm only by about 1000rpm. so a total of about 4000 wil be fine so it will be save. i can rev the car to 5000 no problem manually.

 

just a quick question. do you have an idea how much it would be raised if i only remove the spring? the trans build tag says KCF. i dont now wat valve body that is, anyone got an idea?

 

The spring is pretty weak, I can't imagine it raising it by more than 1000 rpm but I never tried it alone.

 

You can raise the wot shift points by shimming the tv limit valve spring. I’d ad .090” to start with

 

That would bring it to the RPM the OP says he would be happy with.

 

is it a JJ valve body?

 

Yeah, I have encountered this on two or three 2004R transmission, 3000 rpm WOT shifts. The basic replacement governors raised it 4000 rpm WOT. The Transgo shift kit, changes the TV limit spring among others, it raises the WOT shift points 300 to 500 rpm. Honestly get the big Transgo shift kit, has bigger boost valves, bigger servo and stiffer springs that improve all shifts. If you shave the small weight as small as possible raises shifts to around 5000 rpm, 4900 to 5100 rpm with the Transgo TV limit spring. I also drill and tap a flap top small fine thread screw to keep the spring in place, I used red loctite then shaved the head flat. This fixes the common spring launching issue with the lighter weight. It is trial and error, here is how much to remove.