Pros/Cons of T56 VS Th400 in a turbo car aka, why T56 turbo cars suck.
And yes, the converter does take a lot of shock out of the driveline, evident by many broken driveshafts/u joints and rear ends.
Get rid of that th400 and put a 4L80 in it! OD is where it's at for any kinda highway tolerance. That or put some 3.00ish gears in the rear and keep the 400.
I already have 3.08 in the rear. Can't stand it.
made the car a race car basically, can't go on cruises locally cause cruising at 80 mph makes me want to blow my brains out.
T56 rules for street cars, but they sure don't last
made the car a race car basically, can't go on cruises locally cause cruising at 80 mph makes me want to blow my brains out.
T56 rules for street cars, but they sure don't last
Then go 80E. I have 3.00s (with stock size tires) and turn 2050 rpm at 70 mph.
IMO, "drivers driving habits", to put it in a politically correct manner, and the weight of the f-body's. There are several of us RX7 guys making 800whp+ with T56s and no breakages yet.
Best bet, regardless of the car, is to build an external pump setup that draws from the bottom rear of the tranny and pumps to the top front of the tranny and sprays the gear set. An even better way would be if you run it to a tranny cooler in the process.
Best bet, regardless of the car, is to build an external pump setup that draws from the bottom rear of the tranny and pumps to the top front of the tranny and sprays the gear set. An even better way would be if you run it to a tranny cooler in the process.
I know it sounds stupid but has anyone rigged a T56 up with a torque conveter? I have seen thta nelson Racing Engine sdid this with one of their builds. IT was a rear engined sand rail type truck. they used a sequential box with a torque converter. just a thought.
Chris.
It could probably take the load, but I haven't seen any high HP "Turbo Clutch" cars (Th400 with a clutch instead of a converter). The kit was popular in the 70's, and I've heard they are starting to make the parts for them again.
And yes, the converter does take a lot of shock out of the driveline, evident by many broken driveshafts/u joints and rear ends.
And yes, the converter does take a lot of shock out of the driveline, evident by many broken driveshafts/u joints and rear ends.
Obviously with a auto you dont get any of the shock loadings of the above. so thye should be much eaiser on the trans.
Please tell me if im wrong! lol
T56 lots of cons but its more for street fun.
It was hard for me to chose between an A4 or T56 - started with a A4 did great for with that, since the car sees the track maybe 5 passes a year and a little street cruise i stayed with t56.
If i was a turbo or S/C car i would go with an A4 but the idea of a hammer to install the 4L80e kills me. I could consider an A3. On the other hand the car would see much more track time.
It was hard for me to chose between an A4 or T56 - started with a A4 did great for with that, since the car sees the track maybe 5 passes a year and a little street cruise i stayed with t56.
If i was a turbo or S/C car i would go with an A4 but the idea of a hammer to install the 4L80e kills me. I could consider an A3. On the other hand the car would see much more track time.
I ran a lot of 10.4s at 128 mph with 1.48 60 foot. However I pretty much had to replace everything on the car while doing so. 3 track outings in a row I had to get towed home, Drive shaft and last time out with it I snapped the tail shaft and destroyed the housing and the shifter came off in my hands as I pulled second.
Swapped in auto, running same times I haven't broke yet with 4 track outings lol.
Swapped in auto, running same times I haven't broke yet with 4 track outings lol.
If the highway rpms **** ya off you could get a gear vendors OD unit for the back of your th400. I dont think they are cheap, at nearly 2600$. But then you get much higher gears when you need them while retaining the gear set you need for drag racing. And from what I remember you can shift it on the fly under power. Its a great unit. Im thinking about it reading this thread again.
Last edited by 99SS-T; Sep 7, 2010 at 04:08 PM.
This thread makes me sad because I love driving a 6 speed, went out of my way to find a nice one, and most of its time is spent cruising on the street, but I know as soon as I get the turbo installed and (hopefully) start making 600 RWHP - the T56 and LS7 clutch are going to bite the dust and it's going to be big money to do a built T56/big clutch combo...
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
This thread makes me sad because I love driving a 6 speed, went out of my way to find a nice one, and most of its time is spent cruising on the street, but I know as soon as I get the turbo installed and (hopefully) start making 600 RWHP - the T56 and LS7 clutch are going to bite the dust and it's going to be big money to do a built T56/big clutch combo...
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
I paid $700 for my built TH400, and $725 for the PTC 3200, and it'll hold as much as the twin disk + be much more turbo friendly
This thread makes me sad because I love driving a 6 speed, went out of my way to find a nice one, and most of its time is spent cruising on the street, but I know as soon as I get the turbo installed and (hopefully) start making 600 RWHP - the T56 and LS7 clutch are going to bite the dust and it's going to be big money to do a built T56/big clutch combo...
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
But the thought of going to a TH400 or 4L80 and selling my stock T56/LS7 clutch while it's still low miles and in good condition to fund a transmission that can better hold the power just makes too much sense to me, instead of throwing big money at a T56/clutches that I don't have.
I'm feeling sick now that I'm adding up what I have in the car. Good thing I'm not married. I could put half down on a house.




Im going power glide when i go turbo! 