i put a 2004r czf with d5 convertor from an 86 monte ss i left it stock just changed front and rear seals and filter it stalls at 2500 - what a difference over a non stall i still dont use 4th cause i lock at about 1500rpm at 65 (still have 2.56 gears) trans has been great the 2 weeks its been in (about 800 miles) had to have it sitting almost on its side to go in though (i have ta headers that i left on during the swap) that was about only issue i love mine
I swapped one into my '66, replacing the stock 2 speed. Along with 3.90 gears, it really woke the car up. ( stock 340) Are you planning on re-gearing the rear end too? The OD is pretty useless with anything under 3.42, IMHO. If I was running a big block, I'd stick to a 3.08 to 3.42 and run a TH-400. The extra torque from the BBB will allow a less aggressive gear. Not worth the extra expense and hassle of the swap. My theory is the same for manuals....small blocks get gears and a 5 speed. BBB gets 3.08 and a 4 speed. That's just me though:TU: Brian
My research agrees with what you have discovered the hard way. The 200-R4 is not for our powerful torque monsters. The 400 is a great transmission but its lacks overdrive for comfortable highway use. The 4L80E is built tough with overdrive but its 100 pounds heavier than the 400. Check out the article below in Hot Rod magazine on the 4L80E transmission and a couple other sites for anyone considering a transmission swap or modification. Its not easy or cheap to get the results we are after. http://www.hotrod.com/techarticles/drivetrain/gm_4l80e_automatic_transmission_review/index.html http://www.gearvendors.com/hrgm4s.html http://www.high-impact.net/transmission_and_gear/badboy4l80e.htm
My 70 has a stock gn 2004r i have over 15000 on it since the install and was used with 64 k on it with 3.08 axle shift into over drive at 55 cruise at 75 mph about 1600 car gets 22 mpg the motor has an old kennie bell cam, hie dist and everything else is stock out here in boston alot of gn guys have over 400 rwhp hp and 550 ft lbs and they live along time before having to overhaul them i was at a dyno guys shop on peabody ma we dyno a 89 tta with a gn motor 443 rwhp 561 ft lbs the car runs 11.1 the trans shifts like a turbo 400 my opinion do it the car will drive so nice feels good to be driving a 40 year old car in the fast line passing people and my car needs a ton of work body paint interior but drives like a dream i have a camp in northern maine i dont take my suburban if the weather is nice i save money by driving the 180000 mile sky convertalbe SO COOL with the roof down .... and its down because there is nothing left to it hehehe :3gears:
I run one with a supercharged 455. It is time to get a better conveter. The one I have is due for a freshining. Will add a billit forward drum. There are only a few builders I would trust to build this tranny. For me it is a local guy I have know for 20 years. The ones I can think of off hand are Vince Janis, Extreme Automatics, CKPerformance. For converters go with PTC or Edge.
