How to set engine / transmission angle? (LS1 more specifically)
Thread Starter
Instructor
Joined: Jul 2007
Posts: 214
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From: Leavenworth KS
How to set engine / transmission angle? (LS1 more specifically)
I am to the point of bolting up my engine and tranny (LS1 / T56) and am curious as to how to measure the engine / transmission angle. I need to mount the transmission to that center crossmember, and am going to try and do so with some sort of fabricated mount, but I want to make sure everything is going to be aligned properly. Any ideas guys?
Safety Car
Joined: Aug 2001
Posts: 4,883
Likes: 11
From: North Easton Mass
This is pretty un-scientific but there aren't many LS1/T56 conversions using the stock frame, at least not that I could find. The driveline angle is more severe side-to-side due to the shorter driveshaft, so I tried to get the front u-joint to be square in the vertical axis. I made my mount adjustable so that I can change the angle if the trans hits the tunnel once the body is back on. After I can test-drive the car I'll probably have the mount welded into place. Here are some pics of my solution. Don't laugh at my fabricating skills or I'll delete the pics. 
Rick B.
Mount sitting on top of x-member:
Trans lowered to make u-joint square vertically:
Adjustable mount - uses stock holes on top and bottom of x-member:
Rick B.
Mount sitting on top of x-member:
Trans lowered to make u-joint square vertically:
Adjustable mount - uses stock holes on top and bottom of x-member:
Last edited by 72LS1Vette; Jun 25, 2008 at 03:52 PM. Reason: typo
Thread Starter
Instructor
Joined: Jul 2007
Posts: 214
Likes: 0
From: Leavenworth KS
I think I remember reading somewhere that the tranny needs to have a rubber mount for 'movement' I am running solid motor mounts, do I need to use the stock rubber tranny mount and make that work? And the adjustable idea is great. That way I can make sure it is perfect. What driveshaft are you using?
Safety Car
Joined: Aug 2001
Posts: 4,883
Likes: 11
From: North Easton Mass
Don't know the answer to the mount question. I'm using standard rubber engine mounts and a poly trans mount. The driveshaft I'm using came from a car that had a TH400 trans in it. I'll see if I can find the measurements and post them.
Rick B.
Rick B.
Last edited by 72LS1Vette; Jun 25, 2008 at 03:52 PM. Reason: corrected trans model
