I've got an old t-90 and d-18 combo and I'm pondering adapting it to fit behind a 4.3L V-6. It'll be a daily driver, and I'm wondering if they'll hold up. I've heard stories about the d-18 suffering from exessive wear because it's a side-drive, but it's also a pretty strong case.
Another question...The output on the d-18 is offset, but does the diff have to be also? It's not going into a shortwheelbase, but into a midsize pickup. I know that's a different vehicle, but the t-90 and d-18 both came in shortwheelbases so I ask you guys. Do you think the offset will matter in a vehicle with a little longer wheelbase? Or should I just save and go for a TH350 and a different case? TIA
I have a corvette 283 in front of a T-90 Spicer 18 combo and i have had no problems. A friend of mine has a willys pickup with a Chevy 350 and has been driving it around for about 20 years with no problems. He uses the truck every day and skids logs and hauls firewood with it on the weekends.
"A friend of mine has a willys pickup with a Chevy 350 and has been driving it around for about 20 years with no problems. He uses the truck every day and skids logs and hauls firewood with it on the weekends."
That sounds like the makings for a truck commercial.
My Combo is a Chevy 350 to TH350 to Dana 18, and per everything I've read I do not expect to have any trouble. The rear axle in my jeep is offset to match the t-case. I'm not sure if you should be concerned with it on a long wheel base. You may have trouble because of the multi angles (up and down, and left to right). If I understand correctly, Dana 60 centers are naturally offset due to the pinion location. You may be able to find one the is right of center that will lessen the left to right angle.
If your concerned about the angle why not convert it to a D20? Or just swap it for one. There the same case but the d20 has a centered rear output and 2:00 low gear. You can change that to a 2:46 low with Bronco gears.
The Dana 18 should be no problem. It is said that you get around 30,000 to 40,000 out of the case before rebuilds, but plenty of people go over or under, depends on driving habits. The intermediatre shaft, the shaft that gets the wear, can be removed and replaced with the case on the vehicle. I wouldn't worry much. It is a great setup.