LS1TECH - View Single Post - What would you like to see addressed in the TH400 FAQ?

12secSS · 08-16-2004, 04:19 PM

Here is what I learned from my 4L60E --> TH400 w/Transbrake:

I used the BMR TH400 crossmember, it fit perfectly.
I also used the BMR X-treme torque arm, it comes with a driveshaft loop so don't purchase one seperately.
You use only five (5) bolt to secure the trans to the engine, left three and right two. The middle top bolt is not used, not are the bottom two. Only the one next to the alignment pins and the upper left one.
A 1998 flexplate can be used with an SBC converter, you'll need 1/8" space or washers.
You will need (if you use an SBC converter) at least a 7/8 pilot spacer (B&M p/n: 2801054-19, not sure if we sell it individually)
Do not use Lokar Firewall mount dipstick (p/n: TD-3350400FM), it is too short and will end up under the cowl, hard to reach for filling up the trans/checking fluid level. It can be done though.
Use the speedometer items from a 3L80 (3 speed trans) truck, part numbers were previously posted (GM# 8655291, 8655315), they work perfectly on ex-A4 cars. Just cut the (will verify wire colors) wires and splice them to the connector (p/n: 12085498)
You will need 1/2" NPT hose pipe adapters to fit into the trans (may be different, 5/16" NPT) with 5/16" hose to mate up to your OEM cooler lines. Just use a pipe cutter, about 3" of 5/16" hose and four hose clamps and it will seal up fine.
I used my HPTuners software to delete all the references to the A4 trans and it has worked great, you can also use a manual trans program or ECM, but the speedo signal will need to be multiplied by 2.5 to read correctly.
If you use the OEM park/neutral safety wires (connect together purple and dark green) and the reverse wires (connect together brown and light green), the computer will know the trans is in a drive gear.
My driveshaft was made by Wenco Industries and the length was exactly 44" using a KTRE 12-bolt with 1350 yokes, spicer u-joints.
My shifter of choice was a B&M Quicksilver for positive gear selections, it works better than OEM.
I will be adding a B&M Trans cooler with integral fan to keep the trans fluid cool.

08-16-2004, 04:19 PM	#18
12secSS 12 Second Club 2001 Chevrolet Camaro Trader Rating: 28 Join Date: Nov 2001 Location: 93065 Posts: 3,693	Here is what I learned from my 4L60E --> TH400 w/Transbrake: I used the BMR TH400 crossmember, it fit perfectly. I also used the BMR X-treme torque arm, it comes with a driveshaft loop so don't purchase one seperately. You use only five (5) bolt to secure the trans to the engine, left three and right two. The middle top bolt is not used, not are the bottom two. Only the one next to the alignment pins and the upper left one. A 1998 flexplate can be used with an SBC converter, you'll need 1/8" space or washers. You will need (if you use an SBC converter) at least a 7/8 pilot spacer (B&M p/n: 2801054-19, not sure if we sell it individually) Do not use Lokar Firewall mount dipstick (p/n: TD-3350400FM), it is too short and will end up under the cowl, hard to reach for filling up the trans/checking fluid level. It can be done though. Use the speedometer items from a 3L80 (3 speed trans) truck, part numbers were previously posted (GM# 8655291, 8655315), they work perfectly on ex-A4 cars. Just cut the (will verify wire colors) wires and splice them to the connector (p/n: 12085498) You will need 1/2" NPT hose pipe adapters to fit into the trans (may be different, 5/16" NPT) with 5/16" hose to mate up to your OEM cooler lines. Just use a pipe cutter, about 3" of 5/16" hose and four hose clamps and it will seal up fine. I used my HPTuners software to delete all the references to the A4 trans and it has worked great, you can also use a manual trans program or ECM, but the speedo signal will need to be multiplied by 2.5 to read correctly. If you use the OEM park/neutral safety wires (connect together purple and dark green) and the reverse wires (connect together brown and light green), the computer will know the trans is in a drive gear. My driveshaft was made by Wenco Industries and the length was exactly 44" using a KTRE 12-bolt with 1350 yokes, spicer u-joints. My shifter of choice was a B&M Quicksilver for positive gear selections, it works better than OEM. I will be adding a B&M Trans cooler with integral fan to keep the trans fluid cool. __________________ George P. Lara 2001 Camaro SS #0391: FQuick Garage Last edited by Flame Throwing SS; 11-10-2005 at 04:31 PM..