Re: Any good tranny shops out there BESIDES Jakeshoe and CK?
A couple others to try to talk to would be Century transmission (make sure you talk to Mike). He's been doing 200-4Rs forever and has a good reputation in the community. I've also heard a little about jakesperformance.com but nothing directly.
I've found just good basics (such as DON'T shim the crap out of the accumulators and DON'T raise the line pressure sky high with a race only valve body kit) will usually net a firm (not neck jerking) shift and result in good reliability. Also, experiment a bit with trans fluid (like use Type F for slightly firmer shifts and so on).
The bottom line is that this is a small (and shrinking) market, so the pickings are getting slim for any vendor/shop to want to spend a bunch of time on these. Most of their customers are going to be more interested in high HP performance builds, so you're request is probably a bit out of the "sweet" spot for a lot of these guys.
On the 4L80E/4L70E/4L65E/4L60E front (in a turbo Buick, right?), there's a ton of rebuilders and if you have an "E", you should be able to do a lot of tuning with your powertrain management solution (from context, I assume you've got something like a FAST XFI or whatever to control an electronic transmission?).
In that case, I'd just build a good reliable unit and then use the tuning software to adjust shift points and pressures where you want? Since this is a daily driver, it sounds like, you don't need a bunch of the exotic hard parts and the electronics can give you A LOT of adjustability (. (especially if you're not making a ton of horsepower). Heck, you can even have a race tune and a street tune to change things between your commuter use and hammering on it?
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Ken Mosher
1987 GN original owner 650+ HP Black
2015 BMW 328xi XDrive wagon
2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold)
2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold)
2014 Silverado LTZ Crew 4WD
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