2 questions

It is to my understanding that you need 3/4T hubs to lay a square out on semi's. I keep reading about guys making their control arms longer after doing this because it sucks the wheels in too much. I know lengthening the control arms gives more lift but is this mod done purely for aesthetic reasons or are the wheels sucked in so much after swapping to 3/4T hubs that the inner part of the wheels rubs on something? Does anyone have a pic of a square on semi's, with 3/4T hubs, and stock control arms?

Also I just got an '85 model C&C rear which I am going to have reabuilt before installing and I wanted to have the gears swapped while everything was apart. The C&C has 4.10's (same as my stock rear) and I wanted to swap to a numerically lower gear for lower revs on the highway since I am keeping my TH400 trans. The numerically lowest gear I can find for the 10.5" 14 bolt is a 3.73 from LMC truck. Does anyone make anything numerically lower?

if its a 14 bolt rear end you can get a 3.42 gear for it but its a factory gm gear which is why you cant find it, i have no idea about the dana 70 rears though

I thought you only needed 3/4 ton arms??

Thanks RHMdually, I guess I'll go to the dealer and see if I can get some 3.42's for my C&C.

So do guys make their control arms longer when swapping to 3/4T hubs because it looks weird if you don't or because it is necessary?

it cuts down the amount of turning radius with the wheels being in so far, the wheels rub the frame in turning...

Also I have read that 3/4T hubs are only needed if doing a body drop. Is this just for shitboxes or does this apply to squarebodies also? I just want to lay frame on 24's.

3/4ton hubs/rotors will not work, you have to use 'Single Rear Wheel', Front rotors. The 3/4ton rotars are not correct, I tried this already no success. The offset of the hubs from 3/4t to 1t SRW is only about an 1/8th inch different. the bearings and seals are the same just the offset of the bearings inside is different. When you use the SRW front rotars the big 22/24 will rub on the inside of your frame. Alot of work is involved. It all depends on your originality like layindoor's truck. 3/4t stuff "LOOKS' similar and "LOOKS' like it will fit but it is all very much different. Im in the process of all this right now so I will post some pics on this. This has been gone over I think for quite some time extensively. But stay away from the 3/4t front stuff. For the rear, the 3/4ton axle is the same as C&C. The only difference is the brakes. For the most part you can bolt the adapters right up to the 3/4t rear.

My dually is BD on 22" semis...I have 3/4 rotors and had c-arms made longer to push my wheel out just enuff not to hit my fender and a c&c rearend.

Please do post pics of the progress on your front end. I know this has been discussed before, many times. I just wish there was a sticky with info on what has been proven to work to lay on semi's on a square, with part #'s. I've already got my C&C for the rear it's the front end that has me confused.

88-91 CK30/CK5 were the intermitant guinea pigs until the shitboxs were in full swing. Part numbers are infact different. I just tried this swap from my 3/4t to my 1t and had no success.