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I'm chucking a Lq4 with a 4l80e into my 76 corvette, the car never came with a driveshaft, I have a stubby end for the 4l80e.
Im wondering, what's the best way to go here? The Ls engine has a 4" diameter shaft, the c3 had a 2.5". If I bought a used driveshaft how would they make it work with the 4"?
I know they usually cut off the yolk and build a new tube but not sure what the best route here is with there being such a large diameter difference.
I'm chucking a Lq4 with a 4l80e into my 76 corvette, the car never came with a driveshaft, I have a stubby end for the 4l80e.
Im wondering, what's the best way to go here? The Ls engine has a 4" diameter shaft, the c3 had a 2.5". If I bought a used driveshaft how would they make it work with the 4"?
I know they usually cut off the yolk and build a new tube but not sure what the best route here is with there being such a large diameter difference.
Driveshaft diameter is generally determined by HP level, length, and speed. I also recall that C3 Corvettes used a bolt on yoke at the transmission. Something like this:
I don't understand what the struggle is. Any competent driveshaft shop can make a custom driveshaft for you.
Andrew
Not really a struggle, but so I need the original shaft end at the diff or just tell them the yolk size.
The shop I use closed down so I gotta find someone who does it on the island.
Not really a struggle, but so I need the original shaft end at the diff or just tell them the yolk size.
The shop I use closed down so I gotta find someone who does it on the island.
Just measure the diff u-joint and they should be able to handle the rest.
Maybe call the Drive Shaft Shop (https://driveshaftshop.com/custom-driveshafts). They've done quite a few for folks on this forum. Some of us use a CV joint on one end to reduce vibration. They can do just about anything you need. You said "Island", so maybe shipping is an issue for you.
For my C3, LQ4 turbo, 4L80e intall, I went with a 3" chromolly driveshaft. I use the long (not stubby) end for the 4L80e because I have a solid axle that moves rather than the fixed location of stock C3 rear ends.
This setup is good for !000HP. I'm running over 700 at this time. I can take a picture from under the car to let you see the fit if you want.
For my C3, LQ4 turbo, 4L80e intall, I went with a 3" chromolly driveshaft. I use the long (not stubby) end for the 4L80e because I have a solid axle that moves rather than the fixed location of stock C3 rear ends.
This setup is good for !000HP. I'm running over 700 at this time. I can take a picture from under the car to let you see the fit if you want.
Can that driveshaft be removed from the bottom? I see that you do not have a two-piece yoke at the front.
When I did a LS1/4L60E swap into my 71 Corvette I had to have a custom drive shaft made. Not much room in the tunnel for a large diameter drive shaft. I bought a yoke for the trans that matched the stock C3 u-joints. Slide it in the trans and then just measured from the center of the trans u-joint yoke to the diff u-joint yoke. Hand drawn pic for the drive shaft shop. Any good DS shop should be able to figure it out.
Can that driveshaft be removed from the bottom? I see that you do not have a two-piece yoke at the front.
Andrew
Yes, it can be removed. Remove the 4 bolts at the rear end pumpkin, move it to down (may need to jack the rear some to make more clearance), then the yoke simply slides out of the transmission.
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4l80e driveshaft question 
