I didn't cut my tranny tunnel and 5 years of aggresive use has had no consequences with my TKO. Not worth the effort, IMHO to go cutting up a perfectly good car. I've broken just about everything possible on my car, except for U-joints... so IMHO worrying about the drive line angle just isn't that much to worry about ::

 

I second 2bav8. I have driven the [censored] out of mine over the years. You should shim the rear axle using angle shims, mine needed 2 1/2 degrees. No vibration at any speed.

 

I ran a TKO for a year, until I broke my engine. I did not have any driveline issues as a result. The only problem I had was that the knob on the bottom of the tailshaft housing was the lowest point on the car. If I came off a speed bump too fast the trans got a good whack.

 

Who did you get the shims from? They were mentioned by Fred at Dark Horse when I inquired but he didn't go into any detail. Were they a PITA to install?

Doug

 

Summitt sells em' and so does Jegs.

Or you can go to a local driveline shop and they should sell you some (that's what i did).

They're called "Pinion Angle shims" or sometimes "leaf spring axle shims"

 

Very cool then - thanks for the fast reply. I'll be picking some up when it's time for the install...

Doug

 

Before everyone starts putting shims in to correct this problem, let me point out a couple things. First, later year 'stangs (67-newer) don't have quite the same angle problem b/c their tunnels are bigger. Second, the amount/ability to shim will vary depending on the engine mounts and if the car has been lowered.