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Old 02-05-2002, 04:27 PM
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Unhappy 66 Pontiac overdrive tranys?

I now have a 66 Leman 2 door, 400, powerglide, 2.56 single-wing. I'm ready to put in a 455, "?", 3.90 HD 10" posi. In order to continue its use as a fabulous highway cruiser, I need an overdrive trany. The options I have found so far are 700r4 with adaptor plate(I've heard bad things about adaptor plates), or TH400+AmericanEagle overdrive(I've heard bad things about AEO's and too short drivelines). What other choices are there? I don't want to spend $2000+ on a trany, only to find out it doesn't work. What's the best troublefree option?

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Old 02-06-2002, 05:54 PM
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Odda....the best GM OD trans is the 4L80E, which is basicly a new design, 400 Turbo w/OD, which is electroniclly controlled. They are bullet proof, and you can get the controller from TCI transmissions. I would stay away from 700R4's myself......
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Old 02-09-2002, 01:04 AM
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To glen "HotRod" hayes: why stay away from the "700" tranny? This is the first testimonial I have seen that they are not God' answer to all that is automotive!
I have been getting the impression the 700R4 was as tough as a TH400, only better. What's up?
I am returning to rodding after a 20 year absence, and have a lot to catch up on!
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Old 02-10-2002, 01:23 PM
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the 200R will bolt up to your 400 but I would beef it up a bit the 200R tranny has a corporate bolt pattern and a .63 final drive ratio the cross member will have to be moved to the rear a little farther and wired up so the converter will lock up. B&M makes a shifter kit for it
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Old 02-10-2002, 06:15 PM
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I am inclined to agree with Tom about the 200r, with a little help, it'll do what you want, as long as you don't measure your success with 450hp and in 1/4 mile sections. The 700r will bolt up with the adaptor, which will do the same as the above given the chance. I run an adapter on a Turbo 400 BOP patterned tranny(mine actually came out of a '73 Caddy) on a 350 crate motor, have had 0 problems with it so far. Cant imagine why the Chevy pattern with an adapter wouldn't work on a BOP engine. Once again, the end result and what you intend to do with it may have a big influence on the results you actually get. The 200r will have a better low gear than the 700r, the remainding gears will be close in ratio. Check out the April 2002 issue of Rod and Custom, it may give you the answers you are looking for.
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Old 02-15-2002, 12:14 PM
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I think its important to know up front what your application, cam and engine component, and budget/$$ is going to be. Streetrod with driveability most likely dictates 700R4 or 2004R and anywhere from $950 to $2k depending on components and torque/stall converter choice. Th350's and Th400's are in the $700 to $1400 range and are suited for street/strip applications with lots of room for horsepower and abuse. The Overdrives will handle abuse also(sometimes upward of 450hp/550lbs ft. torque), but not like the th350 or 400. For the hardcore DragStrip guys, there's nothing like a powerglide and those prices are determined by your need for speed. Bottom line is all of these GM trannys are great and can be applied to all applications. Just in different quantities,results and MPG's. IMHO :p

[ February 15, 2002: Message edited by: 450hp67SS ]</p>
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