So alot of you know I have been planning on installing a 6spd allison for the past year or so. I like the idea of having as many gears as possible to get great acceleratioin and mileage at cruising speeds.
The allison has good gear ratios and is designed for a diesel application not to mention will handle my twin turbo'd engine with very minor mods. the only problem is I have been waiting on the electronics to control it for over 6 months now and I am getting tired of waiting, not to mention I dont think this bone stock 700r4 is gonna last long with my motor. Oh yeah, I will probably have to severly mod my trans tunnel to fit the allison.
The 4l80/85 is a good trans in my opinion with the proper internals and converter not to mention it already has several options for electronic controls. I can install a pcs controller and have 2 different shift programs and I think it will handle my little motor after a proper build. The downside is that it will be expensive to build the 4l80/85 for ultimate reliability with my motor and get a properly selected converter, I would imagine I could rack up a $5000 bill quickly for a complete setup. I could always do it in stages as money allows though, converter and electronics first then build the internals later on.
As for getting more gears out of the 4l80/85 I have thought of installing a gear vendors behind it. I could have a .59 overdrive for excellent cruising rpms at 70mph for optimal mileage but still have great acceleration, I could even bump up to a 3.55 gear instead of the 3.08 or 3.27 I have now. I have pcs looking into a way to program their computer to make the gear vendor shift automaticly for me instead of having to push the button everytime I want to use it. I have also considered looking for a 4l80/85 from a newer model chevy van with a duramax since they come with that style trans instead of the allison.
Can anyone tell me the difference between the 4l80e and 4l85e?
The gear ratios are
Allison
3.10
1.81
1.41
1.00
0.71
0.67
4l80e
2.48
1.93 (GV o/d)
1.48
1.15 (GV o/d)
1.00
0.78 (GV o/d)
0.75
0.59 (GV o/d)
I would probably never use the gear vendors to spilt gears only to have the extra overdrive gear, I just wanted to show you all the gears possible.
So what do you guys think? Which one?
Either way I wont be doing this for a little bit longer but I hope to have the truck running soon and I know the 700r4 wont last long so I need to get something in the works that will last and I refuse to have my truck down for several months again waiting on trans electronics for the allison. On the flip side if the 4l80 sounds like a bad idea I will wait for the allison.
The allison has good gear ratios and is designed for a diesel application not to mention will handle my twin turbo'd engine with very minor mods. the only problem is I have been waiting on the electronics to control it for over 6 months now and I am getting tired of waiting, not to mention I dont think this bone stock 700r4 is gonna last long with my motor. Oh yeah, I will probably have to severly mod my trans tunnel to fit the allison.
The 4l80/85 is a good trans in my opinion with the proper internals and converter not to mention it already has several options for electronic controls. I can install a pcs controller and have 2 different shift programs and I think it will handle my little motor after a proper build. The downside is that it will be expensive to build the 4l80/85 for ultimate reliability with my motor and get a properly selected converter, I would imagine I could rack up a $5000 bill quickly for a complete setup. I could always do it in stages as money allows though, converter and electronics first then build the internals later on.
As for getting more gears out of the 4l80/85 I have thought of installing a gear vendors behind it. I could have a .59 overdrive for excellent cruising rpms at 70mph for optimal mileage but still have great acceleration, I could even bump up to a 3.55 gear instead of the 3.08 or 3.27 I have now. I have pcs looking into a way to program their computer to make the gear vendor shift automaticly for me instead of having to push the button everytime I want to use it. I have also considered looking for a 4l80/85 from a newer model chevy van with a duramax since they come with that style trans instead of the allison.
Can anyone tell me the difference between the 4l80e and 4l85e?
The gear ratios are
Allison
3.10
1.81
1.41
1.00
0.71
0.67
4l80e
2.48
1.93 (GV o/d)
1.48
1.15 (GV o/d)
1.00
0.78 (GV o/d)
0.75
0.59 (GV o/d)
I would probably never use the gear vendors to spilt gears only to have the extra overdrive gear, I just wanted to show you all the gears possible.
So what do you guys think? Which one?
Either way I wont be doing this for a little bit longer but I hope to have the truck running soon and I know the 700r4 wont last long so I need to get something in the works that will last and I refuse to have my truck down for several months again waiting on trans electronics for the allison. On the flip side if the 4l80 sounds like a bad idea I will wait for the allison.