Welcome ot FBN ! :welcome500:Currently restoring my firebird just wondering what my options for auto transmission, looking at tci at the moment.
Im keeping the pontiac block, so am i right in assuming I should find a trans with the same bolt pattern as apposed to getting a trans adapter plate? I was originally looking at b&m th350 but i was told to find a transmission with a b.o.p. bolt pattern. The idea behind the car is the "pro touring" route, maximizing drive ability over shear horsepower so the engine has remained relatively stock minus the comp cam and it has been bored from 350-390. Its currently at the dyno so not too sure on numbers at the moment but should be in the 300-330 range. It would be nice to find a transmission thats middle of the road, good low end performance but not winding out at high speed. As long as the adapter plate doesnt compromise the strength or geometry than that definitely opens up a lot of potential transmissions to choose from. I can get some solid dyno numbers as soon as thats completed. Thanks for all the info hopefully we can come up with something. :B):Welcome ot FBN ! :welcome500:
WOW--the answer to that question is that your options are limited only by your budget. :yes
But, I wouldn't go with TCI. :no I had a bad experience with one of their trans, and I've read of others who have, also.
Your best choice, as to type will be dictated by how you plan to use the car--mild street only, high speed freeway cruiser, street/strip, strip only, how much hp & torque your engine will have, etc.
For example: If it were strip only--for competitive bracket racing, a Powerglide has proven to be more consistent, and is therefore used in more bracket cars than any other.
If it is a street/strip car, a 3-speed, like a TH350 or TH400 is best.
If it is a highway cruiser--70-80mph, then there are 2 ways to go. You can go with a 3-speed and lower number gears, like 2.41-.2.73. Or, you can go with a 4-speed, like the 200-4R or the 700-R4, and higher number gears, like maybe 3.42-.373.
Now, as to the brand name. There are several good trans builders around. Some are known more for their TH350/TH400 models, and some are better known for either their 200-4R or 700-R4 builds.
If you'll list, as best you can, the exact specs of the engine you plan to run, and exactly how you'll be using the car, I & others will be glad to give our opinions as to some possible trans/rear combos for your car. :smile22:
Thanks a bunch....got a lot to think about now. Seems like hughes and ati are the safest straight forward option at the moment. Everywhere i look though someone has something negative to say about hughes tci ati or b&m really seems like theres no safe option.You can buy BOP pattern TH350, TH400, and 200-4R. You can also buy TH350, TH400, & 700R4 with Chevy bolt pattern. But the adapter plate is not a problem.
Not too many run 'em on the street, but you also have the option of a 2-speed Powerglide or the BOP 2-speed, called a Super Turbine 300. Most PG's have the Chevy pattern. The ST-300 has the BOP pattern, and uses the same converter as the TH350 & TH400.
You can also buy the TH350, TH400, and 700R4 with a JW brand HD bellhousing, which has a dual pattern.
So, again, there are lots of choices. all the 2 & 3 speeds have a 1:1 high gear ratio. The 4-speeds have an overdrive high gear, which will run less rpm at high speeds, when using the same ratio rear end. So, for high speed freeway cruising you can run a 2 or 3-speed with lower number gears, like 2.41, 2.56, 2.73, or run a 4-speed, with higher number gears, like 3.42, 3.55, 3.73.
I personally would not want a 4-speed, because of the TV cable required for proper function. For street only, I'd go with a TH350 and the rear gears I wanted, for the type of driving I'd be doing. And, I prefer to have a manual/automatic valve body, so that I could either just put the shifter in drive & take off, or put it in low and shift it myself, with a ratchet shifter. :smile22:
...it has been bored from 350-390..."
It is not possible to bore a 350 to a 390, using the stock 3.75 stroke crank. So, exactly what are the specs of your engine ?--block casting number, head number & combustion chamber cc size, stroke, bore size, rods, pistons ?
If you have less that 350hp a stage 2 TH350 will probably be all you'll ever need.
This Coan TH350 with a 36 element sprag will work, even if you move up to more power, later.
The level 2 350 Raptor, on this page will probably work.
Jake's also builds strong TH350's.
And, of course there are many others, including Ebay sellers.
Hey, you can even get 'em built with a 2.75:1 ratio 1st gear, to give you more off the line acceleration, when using the high speed rear gear ratios. Hughes makes a stage 1, with auto/manual VB, & a stage 2, with manual VB.