i have a 2000 base camaro im swapping the engine for an lt1 and i found a transmission a turbo 400 i think anyway it is an automatic my car was originally manual 5 speed i was wondering if this will be hard to do
do i need a new cross-member
a new drive shaft, and there was some kind of bar that went from the back of the tranny to the rear axle do i need a new one of those, and do i need to have a torque converter or can i do with out it
any help will be appreciated.

 

The TH400 is a 3-speed, non-computer controlled automatic. No O/D. Unless you like to hear your engine rev to 3,500 RPM on the freeway, you do not want a trans without an O/D. And being manually controlled, The PCM for the LT1 is going to be looking for the electronic trans controls and setting codes. The TH400 also has a lower numerical 1st gear than the 4L60E automatic, weighs more, and has higher power losses than the 4L60E. To me, the only thing you want to put it in is a high HP track car.

With my 4.11 rear axle, and the TH400, I was close to 4,000 RPM at 70MPH. I ended up adding a Gear Vendors O/D unit to get the revs closer to 3,000 RPM at 70 MPH. An expensive solution to the problem.

You can modify a trans cross-member from an M6 LT1 car for the TH400. You have to have the mount for the torque arm, and since there is none on the TH400 you have to get a mount to attach the torque arm to the chassis rather than the tailshaft of the tranny. Madman Racing may make a torque arm mount for the TH400. And yes, the driveshaft length is different.

Yes, an automatic transmission needs a torque converter.

 

thanks and what is an O/D

 

OverDrive

 

OMG he doesnt know what O/D is so how can he understand your answers?