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Just for historical purposes, I stumbled across another TH200 / TH2004R servo today in a bag of parts. It has a 145 cover and 562 piston and measures the same size as the GN 694 Cover/562 Piston combo (which makes sense since they are both using the same piston.) So if you see one with a 145...

Yup. The fun of the hunt is part of it. Also part of why I pick them up is for the guts when I find em cheap - the pin, cushion hat and springs. When you buy an aftermarket servo, you typically get just the cover and piston. I hate the monstrous downshift clunk when you don't have a cushion...

This happened to be in a pile of other stuff I had picked up. Pure random chance. But when I see 200 or 2004r parts/cores I check em out and snap em up if good, you know, for "just in case" scenarios. This one is a keeper.

Hi all. I know this is an ancient thread, but I can't find this info anywhere so I figured I would post it for future reference for anyone looking. I stumbled across a 200 servo today. It has a 155 piston and 144 cover. It is pretty big. I measured it with my digital caliper. 144 cover -...

That is different than the problem I have. My trans will whine whenever in gear, any gear, even if fully stopped. But not park or neutral. Very slight whine at idle, and if you foot brake it and keep the car stationary but start to bring the RPMs up, it whines even louder. Now, usually this...

Nope. Planning to pull the trans and replace it.

Yup. Thought I had. Maybe I forgot, or wore enough of it off with all of my trial and error fitting. Either way, at least now I know what that god awful noise was.

Just to follow up in case anyone stumbles on this. Found (and fixed) the screechy/chirpy problem in the video. It was the depth of my shims on the converter pads. They were at the perfect depth that they caused the pilot on the crank and converter to be rubbing slightly as the converter...

Well, I'm back. :( So, the whirring (in gear only - nothing in park or neutral) was getting louder, and it started to make a chirpy sound right around 1000 rpm. Everyone said "torque converter, replace the torque converter." Ok - so I had a new converter built and sent out, and replaced it...

Ok, so to follow up on the original issue I was discussing (the "whine") - I did some diagnosing today. Here's what I discovered. Started the car up (hasn't been started in about 2 weeks) - no whining at all, at any time, in any gear, park or neutral. Let the engine warm up, still nothing...

Yup, understood. The only reason I mentioned it as internal is that I've been reading up on how to work on it, the removal procedure and then reinstall keeps stressing that you could dislocate the band, have to measure the clearance to the band, etc. which are internal. :) I think I've got it...

Couldn't tell you - it's an unmarked billet one, builder says it is a custom unit. Exactly why I don't want to get into the internals of this thing myself. :(

Thanks. I'm having a heck of a time finding all the necessary parts to re-install the cushion spring, since I don't have any of the factory parts (I received this tranny as-is.) But, I shall keep looking. And I will update this thread as I make progress (even if that includes just getting a...

Hi again. I've been researching the servo replacements and such, and discovered that all of the servo kits I've found say to retain your existing cushion spring and collar when you go to do the replacement. Since I don't have any of the original parts, I have nothing to retain. So, I was...

Nah, I don't think there was any maliciousness on their part. And of course, they didn't brag about it. I didn't even know it would happen until I drove it the first time and it did it, I called, they said normal for their builds, I asked around, it seemed many builders at the time knew...

Yeah, all of my research is aiming me in that direction. Hopefully this weekend I can diagnose it enough to get down to exactly what it is, and then figure out how I'm gonna get the tranny out if I have to without pulling the motor. Have all the tools (including a tranny jack), its always...

Heh, no, he didn't say "I build them all specifically with the intent they clunk" - what he said was that the servo he uses causes that and it is to be expected in their builds. And from something they said it implied there is no cushion spring in there. And I'm definitely not throwing them...

It's definitely the tranny. It's (from what I've come to learn) the classic 200-4r downshift clunk, it happens when you have the wrong/no cushion spring in the servo mechanism. Always happens same exact speed as the tranny is downshifting at very low speeds when I'm slowing down, and the...

That's a good point since I'm messing with it anyway. I don't really like mucking about with transmission internals myself (again I'm paranoid I'll break something simple) but I'll check this out. Thanks, and any pointers on this are more than appreciated!

Thanks for the ideas. It idles around 850-900 rpm in park/neutral or in gear - with the converter it has, there is effectively no drop putting into gear. What was interesting in my fiddling with it was that in any gear position, it would make the same whine at idle when stopped. In...