20004r vs GN 2004r
- Thread starter TURNA
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LOL, I guess not I was doing 200 from 2,000 but I see what you were doing now.
In my defense I call them 200R4.
In addition to the vb/governor and different torque converter the servo has a larger area to give the band more apply force. The brf in the 86-87 car got the largest one the factory put into a 2004r has a casting code ending in 694(there was one that was the same size and one larger put in the th200 and can be fitted to the 2004r if you can find the setup). The bq(as well as the cz, and oz) got one that isn't quite as big and has a casting code ending in 692.
As supposed above things can be upgraded in any 2004r but some are harder than others to get to shift in a performance manner.
If you need more info i'm glad to try and help.
As supposed above things can be upgraded in any 2004r but some are harder than others to get to shift in a performance manner.
If you need more info i'm glad to try and help.
Maybe a stupid question here but what does "Stage 1" really mean? I see that the transmission places list stage1, stage2 & ect but what is stage N defined as? Would a Stage 2 build be a similar build from different shops as far as specs go?
I recently bought an 87 GN 2004R with the BRF code and it also came with the D5 converter which I didn't know the stall speed of until now. Wow I didn't know that it is 2400rpm stall, that's pretty good for a factory converter. The thing does pull pretty good in the first 2 gears, I forgot how much fun a stall converter is. I had a B&M converter with a 2500 rpm stall speed before behind a TH400 for years before it got a leak and the shop I was at only had a 1800 rpm converter for a stock corvette which i drove for the last years of the TH400 before I made the swap to my current setup.I really love this transmission and it seems like a perfect match with the torque from the 455 it really pulls, plus the OD is the cherry on top, I get the best of both worlds.
That's a good question and I imagine it certainly varies. From what I have seen a stage 1 is simply whatever upgraded parts can be found readily off the shelf made by the larger known manufacturers. So no billet parts like those by CKperformance or anything.
When I bought my 2004r years ago, the guy built them as stage 1 which if my memory serves me right included a performance shift kit, upgraded servo and band, it was outfitted with a .500 boost valve and upgraded clutches (maybe from those common red alto kits).
It really is, IF it is built to handle the power. Excellent gear ratios through out and efficient but needs many upgrades, about 2 grand in parts to live long term behind big torque. My last 2004R was similar to buzz77's stage 1, it died an unnecessary death.
Well the one I bought is a bone stock 87 GN BRF code and all I did to it was wire up the 4th gear pressure switch and lockup solenoid, changed the fluid, filter and gasket and hooked up the TV cable and i've been hammering on it for 3 years now. I have a 455 crate motor with approximately 400-450 hp and it's been holding up fine. I agree if you get any other version besides the 87 GN BRF code then it should probably be upgraded but I haven't needed to do that to the one I have. The proper adjustment of the TV cable is a must to keep this transmission from failing.
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