I'm beginning my twin turbo build soon, I have the engine mods set but as far as the trans I need some advice on complete drop in or stage kits to hold the 800+ target. Re gearing for the 325/50/R22 on 22x12 Fuel Assaults -44 offsets. Custom lift with kings shocks, ladder bars for what I know will be major axle wrap, cv front driveline. Gears will be 4:10-4:56 depending on transmission. Transfer case, front axles etc will suffer. Might upgrade fronts during the re gearing. Not a daily driver and I only tow light loads on rare occasion. Any advice on trans or if anyone has twins I would like to hear your pros/cons.

 

4l80 for sure.

 

my 6l80e went out at 650+ rwhp. Ive heard the 4 speeds are holding up a little better due to being more tuner friendly, and the 6l80e cannot be tuned properly yet. This is from different transmission companies i called, but dont quote me on that, i know the camaro/vette guys are having better luck with them.

Rear diff might hate its life at 800hp especially with heavy off road wheels.

I didnt see you mention it in your post, but you will need an upgraded fuel system to keep up with the demand.

 

Thanks for the info, beautiful truck. I'm waiting for response back on trans. Used in off-road racing that will hold 850 in harsh conditions with similar tire size and gearing. 6L80s are still a mystery. Will post if I find something but I figured being in Az that's not a wasted avenue. Motor, turbos, fuel, methanol, swapped ls9 parts internals. I kicked around a ls9 small block, then boost it with twins rather than supercharger. Bottom line is it's all going to cost the same in the end either way. That's why I'm stuck at trans for now then full speed ahead. Very anxious to start. Looks like these will be the last of the steel body chevys so not a bad one to keep.

 

Second guessing parts was not considered when all this wasn't an option. Green light and now I'm stuck in neutral. Go figure...

 

6L80's are holding 1000HP hooking at the drag strip in C7 vettes, ZL1 Camaro's with a few parts and good tuning. I know taller tires will find weak links but they are holding good power.

RT

 

Got your PM brotha, so far i have a mild comp cam, but for every application its a bit different. I dont know how much offroading you do, but i go hunting, and do some mudding to get to hard locations, there have been times ive gotten stuck in mudholes, and i wish i wouldve had a supercharger, just for the instant power you get, which helps getting unstuck, instead of building boost for the few seconds of trying to get out, which winds up burying you more in the mud. But love the power on the road. Also properly sized turbos with the a nice cam it can close up the boost gap, and be an efficient off-road vehicle.

Fuel system, i have 450 pumps & 60# injectors.

From pm, my front end is holding up good, so is the rear (14bolt).

Also met a fella in the hills that has a turbod ford, turbo was super hot, and as soon as it got drenched in water it blew. Just one instance but I always get nervous when near mud holes now lol

 

60's are too small but I cant tell you which ones you will need. Myself I wouldn't consider anything but a built 4l80 for that big rig with all that power!

 

Off-road only to get to where the fun begins then unload the old CJ-5. I've got it into some nasty clay and slop. Tires with that offset turned the truck brown, took some effort to get it clean. With the kings shocks up front and rear with deaver leafs it will soak some nasty desert humps and bumps. Should leave it as it is but have that hp itch again.

 

Contacted Century, anxious to see what they come up with. Getting excited to get this project going. Looks like fueling this monster will not be cheap.