87-TURBO-T
Member
- Joined
- Apr 16, 2009
Looking for some info on what all is needed including drive shaft length. thanks
Nice, whats done to the th400?I did the swap . I welded the rod to my B@M bracket so it still works . View attachment 267315
Claude.I still have my GN's original 200-4R transmission on the car which was built by the late Eric Shertz of Dynotech, using all the "bullet-proof" parts money can buy, including a Performance Transmission's "Bat Brake". It was quite expensive ($3,500. 7-8 years ago !), but it never broke, always performed flawlessly. I never had the slightest problem with it, BUT that was with my 3.8 aluminium block TA motor with M&A heads, running a personal best of 10.51 @ 129 mph. Now that I have a Stage II 4.1 RPE "badass" motor in the car, Jack Cotton keeps telling me that it's just a matter of time before the 200-4R breaks, that it won't live very long running in the 9's launching a 3,600 pounds car using a trans-brake, and that I should seriously consider converting to a TH-400... At first, I didn't even want to hear about going to a "400", but now, after listening to Jack's explanations, I'm starting to change my view on this and if everything goes well this year, I might go to a TH-400 swap during next winter, we'll see...There are a few things which bother me a bit about going with a TH-400...which are the fact that it doesn't have any overdrive, and also, all of the ones I've seen to date that had a trans brake had a manual reverse pattern valve body which I don't find very conveinient when driving the car on the street, but Jack says that not having an overdrive isn't that bad and the "reverse pattern" thing isn't that bad getting used to either. I already have a B&M "Pro Stick" shifter in my car, so the only thing I'll have to do will be to change the gate plate for a 3 speed reverse pattern tranny (B&M pt#80710). There'll also be a few changes in the crossmember area, driveshaft lenght and front yoke, dipstick, speedo gears, a torque converter, etc...but that'a about it. Brian Cotton has done a few of these swaps already, so he should know what's needed. :wink:
Last, I've spoken to Jack about using a 4L80E (which is a TH-400 with an overdrive), but he doesn't recommend this, saying that most guys who used them had problems with them...
Claude. :smile: