OLDS 200-4R GN servo worth it?

[69hurstolds]

So........

piddling around in the shop today, I found a box of "junk" that had some misc. parts in it that were used, but still good. Looking at them I saw that it was a GN BRF 1-2 servo assembly and cover. 94 and a 62. I think it was either pink or purple-ish spring on it.

I had heard that they had a bit more surface area than the 442 and H/O OZ or Monte SS CZF TH200-4R transmission servos, but not sure if they're all that and a bag of chips.

Obviously, I don't think I'd have a need for an aftermarket unit like one of those Sonnax sewer cover discs, but I was wondering if the 84 H/O could benefit? Wondering if it would be worth a factory part upgrade.

Anyone who's used one as an upgrade have any opinions on it?

 

[64nailhead]

With increased line pressure from an upgraded boost valve and 10 vane pump it make the 1st-2nd shift bone jarring at low rpm's and a blink of an eye at 5500.

2004R SUPER SERVO | 2004R BILLET SERVO

This servo assembly has the largest apply area ever available for the GM 2004R transmission. Its special design results in a 3.005" diameter servo piston which results in maximum apply pressure multiplication and maximum clamping force. Furnishes super positive 1-2 and 2-3 shifts. Easily...

www.ckperformance.com

 

[Longroof79]

Awhile back , I've heard that the TH-200 servo has one of the largest apply areas over all the other GM servos. In fact, CK used to sell them in a kit a few years back.

 

[gnvair]

Awhile back , I've heard that the TH-200 servo has one of the largest apply areas over all the other GM servos. In fact, CK used to sell them in a kit a few years back.

Yes, from what I recall he was selling th200 servos from the 78-79 model year.

 

[L92 OLDS]

I put the super servo in my 200-4R. As noted it advertises the largest apply area of any servo available for this transmission. I installed it in an effort to correct sluggish 1-2 shifts but I later found out my issue was line pressure. In my opinion a 200-4R can be built to shift hard without it. It’s a cool piece and installing it won’t hurt anything.

 

[gnvair]

For a stock/stockish build the 86-87 BRF servo would definitely be an upgrade to any of the other 2004r transmissions. Is it the best? Some builders would probably beg to differ as there seems to be a lot of variation in details like that between builders. But using it couldn't hurt IMHO.

 

[olds307 and 403]

With the stock boost valves, I would bet it will be just nicely firm. Have you put a gauge on it? As said, a soft shift is usually a sign of low line pressure. Going from a .500" to .555" fixed my soft shifts, boosted line pressure from 190 to 220 psi. Not sure how the Transgo billet servo compares, I used that with it as well.

 

[motorheadmike]

If installed correctly it definitely won't hurt.

Make sure the snap ring is seated correctly or you're going on an Easter egg hunt in the street... ask me how I know.

 

[69hurstolds]

1-2 is a semi-firm bump, but for an OZ, I would suspect it should be firmer than what it is. Of course, that could be partly accumulator as well. Hardly any delay in it, and there's no flashing. Probably stick it in there if I end up rebuilding it. Everything is stock spec on it.

 

[motorheadmike]

1-2 is a semi-firm bump, but for an OZ, I would suspect it should be firmer than what it is. Of course, that could be partly accumulator as well. Hardly any delay in it, and there's no flashing. Probably stick it in there if I end up rebuilding it. Everything is stock spec on it.

If things do snowball, be sure to put your whole *ss into it.