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04-10-2021 #1Registered User
- Join Date
- Jun 2008
- Location
- Lafayette, Indiana
- Posts
- 4
Drive Line Angles on Lowered 1968 LeMans (A-Body)
Hi All,
I thought I would drop in from being a long time lurker to see if you all might be able to help me chase down a driveline angle issue on my lowered 1968 Lemans. The car was lowered all the way around with a Hotchkis lowering setup. If I recall correctly it was a two inch drop from stock. The rear end is an upgraded BOP ten bolt that was original to the car. I went ahead and put in adjustable upper control arms over the Winter and now am ready to try and sort out the vibration that the car is experiencing at 65 MPH +. It is indeed a drive line vibration as I tested that last year by nuetral dropping the trans at speed and the vibration remains until the car drops below 65ish.
So here's where we stand.
I've got an inch of clearance before the transmission is resting against the floor. So it could be shimmed up if needed. Using the Tremec app this morning I measured
Engine / trans: 2.3 Degrees down
Shaft was up 1.4
Yolk was down 1.7
I corrected to
Trans still down 2.3
Driveshaft settled to .7 up
Yolk corrected to 2.3 up
Car felt better at lower speed, but wants to shake itself apart at 70. The app showed an updated working angle of 1.7
So what do I start moving to start correcting this? Do I start trying to shove the trans up which seems to be suggested by @AndrewB70 or can we make adjustments both places? I've done a lot of reading but just really confused about what adjustments to start making and where.
Thanks all,
Derek