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Old 02-05-2011, 06:53 PM
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Excessive engine angle?

A few years ago I swapped an LT1 and 4L60 into my '82 malibu. Then, having a hankering for a clutch, I found an LT4 with 6 speed from a 96 Vette with my name all over it. Once I got into the swap it became apparent that I needed to cut the trans tunnel out to fit the transmission. I reached the point where I had cut out as much as I could without cutting the stiffener that runs across the floor pan to raise the tail shaft of the tranny. As it turns out, that put the engine at a 5 degree down angle which is fine, but the crank bore, and thus the output shaft of the trans points directly at the diffentntial yoke. With adjustable upper control arms, the drivetrain is just about perfectly in line. Assuming that I need about a 3 degree angle in the u-joints and the crankshaft and pinion shaft need to be parallel, the only way I have to offset the crankshaft and pinion is to lower the tailshaft of the trans. If I set the engine to get 3 degrees to the the driveshaft the engine will be sitting in the frame at 8 degrees. Carburetion is not an issue because it's injected but are there any other problems that I would create. Lubrication of the trans and windage in the engine come to mind.

Any thoughts?
Thanks

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Old 02-05-2011, 07:40 PM
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I would ignore the shaft angles and check the joints more often. Having zero angle isn't ideal but axle movement will help some and I don't of any gear head that wouldn't be under there for something anyway so when you are, just hit em with a little grease. If you were looking for 150,000 mile reliability then you probably shoulda left it alone!
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Old 02-08-2011, 09:19 PM
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jgrass1
According to you, I've got two things going against me.
It had 150,000 on it when I got it as a true grocerygetter and I am a gearhead
I guess if all of the tranny lube comes out, it's too much.
Thanks for the reply.
Grogetter
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Old 02-08-2011, 09:36 PM
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Can you get someone to weld in a piece to raise the brace arch an inch or so, or maybe weld another cross brace/stiffener further back?
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Old 02-09-2011, 06:12 PM
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Thanks, Nova.
I could do it. It just that it would be a royal PITA. I'd have to completely remove the tunnel I built and installed for the swap and go through the whole process again. After I did the swap, I built a custom console and would have to mod or rebuild it too.
Last weekend, I modified the trans cross memeber to be able to lower the tail shaft in hopes of being able to get all the angles right then struggled with a plumb-bob type angle finder that isn't accurate. It had an error that kept throwing me off by about 2 degrees. -)(*&^%$^&**(^%*&)
I bought a Harbor Freight digital angle finder today. It's not dead on but neither am I. Tomorrow evening, I'll try to adjust the trans mount and rear end control arms to get the trans and pinion shaft parallel and the drive shaft angles to 2-3 degrees.
Wish me luck and I'll post the results.
Between this issue and the rear disc mod, the car hasn't been off the jackstands for a couple of months and I'm itching to drive it.
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