Tunnel or Transmission mounted TA?
01-17-2007, 08:38 AM
#1
Tunnel or Transmission mounted TA? I have been looking for awhile and understand the benefits of the tunnel mount to take stress off the transmission.
Has anyone actually experienced transmission breakage/failure due to the TA being mounted to the transmission? If so please give details on your car and when it broke.
At what kind of HP/TQ levels is it really necessary to change to a tunnel mount, given use of e.t. streets with a manual transmission w/ 4-5k dumps at the track? (not me right now but plan to after many drivetrain upgrades
)
Thanks for the help, James.
Has anyone actually experienced transmission breakage/failure due to the TA being mounted to the transmission? If so please give details on your car and when it broke.
At what kind of HP/TQ levels is it really necessary to change to a tunnel mount, given use of e.t. streets with a manual transmission w/ 4-5k dumps at the track? (not me right now but plan to after many drivetrain upgrades
)Thanks for the help, James.
01-17-2007, 08:53 AM
#2
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I'm assuming the stress on the trans mount is the more likely spot 4 failure. I have not had a failure w my 02. However, I had a 3rd gen (88 firebird) that had a 2.8/5-spd. It boke the trans mount. Hitting the gas would cause the shifter/trans to lift several inches. But they do make those interlocking poly trans bushings, that would likely prevent the movement.
01-17-2007, 09:17 AM
#3
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People do break tailhousings but it seems to be almost entirely
folks with stock steel driveshafts who have gone up in rear
gear ratio, or are on the dyno, either way overspinning and/or
ringing the stock steel piece.
A floor mounted arm will make a lot more vibration in the cabin,
the tranny mass on its marshmallow mount soaks the driveline
vibrations right up.
If you're making monster torque and meanwhile putting a lot of
vibe onto the tail bushing then it's possible to accelerate flaws
in the casting, into full grown cracks.
But at near stock power levels, with an aluminum driveshaft, I
think you might prefer comfort and quiet and just leave it be.
folks with stock steel driveshafts who have gone up in rear
gear ratio, or are on the dyno, either way overspinning and/or
ringing the stock steel piece.
A floor mounted arm will make a lot more vibration in the cabin,
the tranny mass on its marshmallow mount soaks the driveline
vibrations right up.
If you're making monster torque and meanwhile putting a lot of
vibe onto the tail bushing then it's possible to accelerate flaws
in the casting, into full grown cracks.
But at near stock power levels, with an aluminum driveshaft, I
think you might prefer comfort and quiet and just leave it be.
01-17-2007, 10:27 AM
#4
So here is the scenerio:
400wrhp on motor
150 shot
12 bolt or 9" rear-end
4-5k rpm launches
e.t. streets
Is this at the point were a tunnel mount TA would be needed or will a stock type transmission mount be capable? I will also be using a poly trans mount to crossmember bushing.
Thanks, James.
400wrhp on motor
150 shot
12 bolt or 9" rear-end
4-5k rpm launches
e.t. streets
Is this at the point were a tunnel mount TA would be needed or will a stock type transmission mount be capable? I will also be using a poly trans mount to crossmember bushing.
Thanks, James.
01-17-2007, 12:42 PM
#6
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Also, shorter (aka: tunnel mount) TAs provide better launching traction, but make horrible rear axle hop under hard braking. Longer TAs (aka: transmissions mounted) provide better control under braking, but aren't as good for accelleration.
Stronger TAs are better for both.
Stronger TAs are better for both.
