Lowered Engine Mounts K-Member Question

[1950StangJump$]

Hello,

2008 GT with KB, STB, Kooks headers, Magnum XL and one piece aluminum driveshaft.

I am considering a BMR K-member. However, with my blower and STB, I cannot afford even the slightest lift of the engine from where it is now -- the intake tube is already lightly touching the STB. Since I have to assume my OEM engine mount bushings are allowing a little sag after 10 years, adding the new K-member with new mounts MIGHT raise the engine too much.

So, I am considering the K-member that has the mounts lowered 1/2" (KM020R). I'm guessing with the new bushings that the engine will end up sitting about 1/4" lower than now unless I shim it.

Here is my question: If I left it lowered (even up to the whole 1/2" if the new bushings are not higher then the old), will it cause any alignment issues with my Magnum, one-piece driveshaft, and rear end? I'm picturing with the front of the transmission cocked down an extra 1/2", it will rotate the back of the trans and the driveshaft up . . . and I don't have the experience to tell me if that is going to cause any drivability issues. I talked to Kelly at BMR, and he said it would be "unlikely," but thought there was a chance the engine would have to be shimmed up. I failed to tell him about my one-piece driveshaft though, and I'm not sure if they have less room for movement.

 

[Juice]

I doubt a 1/4" up or down at the engine mounts would require a pinion angle readjustment. And even if it did, all you would need to do is a minor readjustment of the pinion angle.
You should have an adjustable UCA, as it is required by the magnum xl swap.

 

[skwerl]

1/4" difference 15 feet away isn't going to change the pinion angle enough to measure unless you're completely anal about it. And since we are discussing a bunch of moving parts, the angle is not constant anyway. Good question but you have nothing to worry about.

I also had the BMR K member with lowered motor mounts in my 643rwhp 2009 Bullitt. I also had the T56 Magnum 6 speed.

 

[1950StangJump$]

1/4" difference 15 feet away isn't going to change the pinion angle enough to measure unless you're completely anal about it. And since we are discussing a bunch of moving parts, the angle is not constant anyway. Good question but you have nothing to worry about.

I also had the BMR K member with lowered motor mounts in my 643rwhp 2009 Bullitt. I also had the T56 Magnum 6 speed.

Good info, thank you. For what it's worth, I have to assume as much as 1/2" difference since I don't know how much the OEM mounts have sagged (unless I shim). Did you install the BMR K-member AFTER the Magnum and driveshaft (with no ill effects)?

P.S. Juice, I called JPC, who did my Magnum swap. They say that an adjustable UCA was not a requirement for the swap and not done. They opined however, if I dropped the motor, I would need to get the UCA and adjust the pinion. Sounded like they were just guessing based on general knowledge though, not on experience with these specific parts.