Making custom mounts

[ST240]

I want to MIG up my own RB swap mounts eventually, but this question is directed at anyone who has designed their own mounts for any hybrid RWD swap (LSx/JZ/RB etc).

When youre mocking the engine up, how do you ensure the drive line of the transmission is perfectly lined up with the driveline of the diff? I imagine this has to be quite precise or youre going to have major troubles with your custom drive shaft...

[Davidss]

It actually doesn't have to be perfect since you're working with an independent rear suspension. A few tips for making mounts:- To get it close you just have to measure A LOT with both a tape measure and an angle finder!-Don't expect to get it perfect the first time. You'll likely have to shim something or redo a mount at least once (so built your mounts with the possibility of shims in mind).-It might be a good idea to find a car with the drivetrain you are using and measure how much the mounts flex (raise it up and down with a jack) so you can take that into account.-You want it to be level (front to back) or a few degrees higher in the front.-Don't expect to get it perfect the first time.-Do the motor mounts first, that way if you're a tiny bit off you can correct it in the transmission mount.-Don't expect to get it perfect the first time.

[240cp]

So basically what your saying is, dont expect to get it perfect the first time

[Z28ricer]

You dont want it perfect.

If you actually did get it dead even lined up with the input yoke on an IRS I believe i've read it would cause problems with the U joints not lubricating properly.

[Blown240sx]

You dont want it perfect.

If you actually did get it dead even lined up with the input yoke on an IRS I believe i've read it would cause problems with the U joints not lubricating properly.

I believe thats right because if its spot on the bearings in the U-Joints would never really be used so the bearings could freeze or lock up.