I was just about to order up a LS1 driveshaft thru gmparts direct for around 239.00 plus shipping BUT I came across LPE website a
3 1/2 alum driveline LPE makes, clearanced for 299.99 but this is what sold me, but the price wasnt bad

The 3.5” diameter LPE driveshaft has a critical speed of roughly 11,000 rpm (over 50% higher than the factory driveshafts). This aluminum driveshaft is 3.5" in diameter and weighs 12.2 pounds. The U-joint centerline to centerline length is roughly 40-9/16”.

In testing performed by General Motors on our 3.5” driveshaft, this driveshaft did not show resonance (hit critical speed) until roughly 237 mph (tested in a 6 speed LT1 equipped F-body with 3.42 rear end gear).

The LPE driveshaft also includes an internal driveline noise suppression system and is high speed balanced to reduce vibrations. LPE recommends this heavy-duty driveshaft for virtually all high speed and racing applications

this is not a plug to premote LPE I just thought it was a good opition to help out the cause

 

Gee...that almost sounds like the stock LS1 driveshaft...isn't the stock LS1 shaft 3.5" ???

Between that and the notorious LPE markup on parts...I would be suspicious...

 

I wanna know what engine they used to get that Fbody up to 237!!! Or did they just do it on a dyno or something?

 

 

What a pig, it made the 1LE shaft look like a toothpick. It was a PITA to installed with SLP exhaust, but it wasnt really that bad. I think its an overkill with my combo, but anyone with high HP this would be a must do mod.

Surprised this wasnt much interest with this topic.

 

Well, from what I have heard the 1LE shaft is stronger than the stock LS1 shaft and smaller also, so it my not be all that much better than the 1LE shaft. When they mention the factory driveshaft in the add, they dont even mention whether it is being compared to the alum or steel shafts.

Ben