Transmission mount problem help needed ASAP
11-24-2007, 09:48 AM
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Transmission mount problem help needed ASAP I am doing a 6 speed to 4L80E swap on my car and the 4L80E I have came with a Yank transmission cross member. My car already has a Spohn tunnel mount torque arm with two driveshaft safety loops. The problem is either the transmission cross member is to low or the transmission mount piece is to short. When I tried to put the driveshaft into the transmission it would not go in without jacking the transmission up about ¼” or so and when it is installed the drive shaft holds it just off of the cross member. I am thinking that I need to shim the transmission up about 5/16” to 3/8” so it will not contact the loop
This is only when the car is in the air and the suspension is unloaded
With the car on the lift and a jack stand under the front K member I had to raise the rear end up about 6 inches to get the driveshaft off of the safety loop
Any help or subjections would be appreciated
All this stuff was got used
This is only when the car is in the air and the suspension is unloaded
With the car on the lift and a jack stand under the front K member I had to raise the rear end up about 6 inches to get the driveshaft off of the safety loop
Any help or subjections would be appreciated
All this stuff was got used
11-24-2007, 10:00 AM
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I am not sure
when I saw that I had to jack the transmission up off of the transmission crossmember I stoped and was trying to figure out what I needed to do to fix it
if the transmission is bolted down now I am afraid it will bend the driveshaft
11-24-2007, 10:09 AM
#4
Well it is not uncommon at all for there to be fitment issues when installing aftermarket components.
Another question.... when the driveshaft is inserted into the transmission, how much space is between the u-joint caps and the pinion yoke?
Did you have the driveshaft modified for this application? Just curious.
The way I understand this issue is... the car is on a hoist, the axle is hanging, the Spohn torque arm mount and torque arm are bolted up, you tried to install the driveshaft but cannot because it interferes with the d/s loops.... right?
What happens if you unbolt the Spohn torque am mount?
g
Another question.... when the driveshaft is inserted into the transmission, how much space is between the u-joint caps and the pinion yoke?
Did you have the driveshaft modified for this application? Just curious.
The way I understand this issue is... the car is on a hoist, the axle is hanging, the Spohn torque arm mount and torque arm are bolted up, you tried to install the driveshaft but cannot because it interferes with the d/s loops.... right?
What happens if you unbolt the Spohn torque am mount?
g
11-24-2007, 10:26 AM
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Well it is not uncommon at all for there to be fitment issues when installing aftermarket components.
the car has a PTS turbo kit, moser 9 inch rear, LS2 403, and some other stuff I am sure
Another question.... when the driveshaft is inserted into the transmission, how much space is between the u-joint caps and the pinion yoke?
http://i46.photobucket.com/albums/f1...sgiving024.jpg
I am not sure I understand the ?? but the slip yoke on the driveshaft is about 4-1/2" long and with and the tail shaft extends 5/8" out of the transmission housing. with the driveshaft installed and the rearend hanging there is 3 inches of the slip yoke sticking out of the transmission and it will go in 1 inch more before it bottoms out
Did you have the driveshaft modified for this application? Just curious.
This entire setup was in a 1998 Trans Am that belongs to another uesr on here and we just swapped transmissions and everything else for the swap
The way I understand this issue is... the car is on a hoist, the axle is hanging, the Spohn torque arm mount and torque arm are bolted up, you tried to install the driveshaft but cannot because it interferes with the d/s loops.... right?
http://i46.photobucket.com/albums/f1...sgiving021.jpg
http://i46.photobucket.com/albums/f1...sgiving020.jpg
correct, to install the driveshaft I had to un-bolt the transmission from the crossmember and jack it up about 1/4" to make it fit. Then when I lower the transmission the driveshaft bottoms out on the saftey loop
What happens if you unbolt the Spohn torque am mount?
I guess ? is would i be better to shim the transmission up or the TQ arm mount down because it has to be one or the other.
I think that it would be the transmisson mount because the TQ arm worked just fine with the 6 speed and stock tranny mount
11-24-2007, 10:34 AM
#6
if i unbolt it and lower it about 1/4" to 3/8" it clears just fine
I guess ? is would i be better to shim the transmission up or the TQ arm mount down because it has to be one or the other.
I think that it would be the transmisson mount because the TQ arm worked just fine with the 6 speed and stock tranny mount
I guess ? is would i be better to shim the transmission up or the TQ arm mount down because it has to be one or the other.
I think that it would be the transmisson mount because the TQ arm worked just fine with the 6 speed and stock tranny mount
Remember, the F-Bodies were never manufactured with the 4L80E, therefore the aftermarket components you have were not engineered for it.
Good Luck with it!
g
11-24-2007, 11:23 AM
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If you have the 6sp. style trans cross member, it sits about 1/4 to 1/2 an inch lower. I used a t-56 trans crossmember and made a 1/4 inch shim in mine an ran longer bolts. That should work for you.
