2001-2002 Allison vs 4L80E in a K2500 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jocko** · 09-14-2018, 11:13 PM

Quick question - I'm a 4L80E fan, but have no experience with an Allison 5-speed. While I'm assuming the optional Allison has a higher torque rating, the 4L80E is no slouch. Am mostly concerned with longevity. Interested in your thoughts for those that have had both or either. My puny 4L60E in my 1/2 ton is on its third life. Am looking around at 01-02 2500HDs and am curious about teh Allisons - am finding more for sale than I thought I would.

And does anyone know the Allison gear ratios handy?

Also, I "thought" they were only available from the factory behind a big block or a diesel, but I have seen some listed on 6.0L trucks that are for sale. Was that an option?

09-14-2018, 11:13 PM	#1
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	2001-2002 Allison vs 4L80E in a K2500 Quick question - I'm a 4L80E fan, but have no experience with an Allison 5-speed. While I'm assuming the optional Allison has a higher torque rating, the 4L80E is no slouch. Am mostly concerned with longevity. Interested in your thoughts for those that have had both or either. My puny 4L60E in my 1/2 ton is on its third life. Am looking around at 01-02 2500HDs and am curious about teh Allisons - am finding more for sale than I thought I would. And does anyone know the Allison gear ratios handy? Also, I "thought" they were only available from the factory behind a big block or a diesel, but I have seen some listed on 6.0L trucks that are for sale. Was that an option?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.