Attention: TDR Forum Junkies 
"Mad Max"
TDR MEMBER
Okay peoples, here's the plan for the big beastie - please tell me what you think.
Engine - Power as is or better @ 253 hp/630 tq at tires.
transmission - 47RE 4x4, DTT-built
Trans case - Mated NP205
Axles:
- Front: D60 dually, 4. 10's
- Rear: D80 dually, 4. 10's, lim slip, ABS
Additionally:
- Gear Vendor o/d (on back of t/case)
- Exhaust brake
Primary use - Highway hauling. Max trailer weight at +/- 10k lbs. Max gross weight including rig will be about 18k lbs.
Thoughts: I can't find a way to alter the 1st and 2nd gear ratios in the auto. So, I need 4. 10's. Hauling my trailer out here from Cali, with the 3. 54's, sucked (on take-off and around town). Way too tall a gear when in first, and I can't find a way to get taller first and second gears that would compare to having a granny low in a 5-speed, so, that means going up in the diff gears to 4. 10's, and adding the GV to bring the highway rpm's back down. Without an additional overdrive top speed would be limited even with DTT transmission. I want to be able to cruise at 75 mph at about 2000 rpm hauling the trailer. After doing the math I'll need the GV o/d to do that. I'm not worried about its strength. I surfed the 2ng gen threads and they generally really like the GV units. There were exhaust brake issues but they were solved.
So, I'd end up with big power, a full tilt auto with lock-up converter, plus an additional overdrive and a gear splitting capability, and 4. 10's to get the big dog moving easily. I like the sound of that and I think the stress on the driveline would be less with the steeper gears.
Considering the rig will be 21' long, weigh over 7000 lbs, and will be hauling a 33' long trailer, I think this setup would be just the ticket. When I need 4wd, it'd be there with the bullet proof 205 and a front D60 with lockouts, and tall gears, and I really like that.
So, there it is - that's my plan. I need y'all's input as to any pitfalls you can think of. In addition, I really appreciate all the PM's and advice that you have provided me - it has really helped me get this rig built 'on paper', and I'm very much excited about driving it in about a year. Only thing is, man, there are going to be a lot of switches and gadgets to make this thing work - but hey, I like switches!! ... and I need more gauges too... . hmmm, what can I tap in to... well, that's the fun part.
- Gonzo
Engine - Power as is or better @ 253 hp/630 tq at tires.
transmission - 47RE 4x4, DTT-built
Trans case - Mated NP205
Axles:
- Front: D60 dually, 4. 10's
- Rear: D80 dually, 4. 10's, lim slip, ABS
Additionally:
- Gear Vendor o/d (on back of t/case)
- Exhaust brake
Primary use - Highway hauling. Max trailer weight at +/- 10k lbs. Max gross weight including rig will be about 18k lbs.
Thoughts: I can't find a way to alter the 1st and 2nd gear ratios in the auto. So, I need 4. 10's. Hauling my trailer out here from Cali, with the 3. 54's, sucked (on take-off and around town). Way too tall a gear when in first, and I can't find a way to get taller first and second gears that would compare to having a granny low in a 5-speed, so, that means going up in the diff gears to 4. 10's, and adding the GV to bring the highway rpm's back down. Without an additional overdrive top speed would be limited even with DTT transmission. I want to be able to cruise at 75 mph at about 2000 rpm hauling the trailer. After doing the math I'll need the GV o/d to do that. I'm not worried about its strength. I surfed the 2ng gen threads and they generally really like the GV units. There were exhaust brake issues but they were solved.
So, I'd end up with big power, a full tilt auto with lock-up converter, plus an additional overdrive and a gear splitting capability, and 4. 10's to get the big dog moving easily. I like the sound of that and I think the stress on the driveline would be less with the steeper gears.
Considering the rig will be 21' long, weigh over 7000 lbs, and will be hauling a 33' long trailer, I think this setup would be just the ticket. When I need 4wd, it'd be there with the bullet proof 205 and a front D60 with lockouts, and tall gears, and I really like that.
So, there it is - that's my plan. I need y'all's input as to any pitfalls you can think of. In addition, I really appreciate all the PM's and advice that you have provided me - it has really helped me get this rig built 'on paper', and I'm very much excited about driving it in about a year. Only thing is, man, there are going to be a lot of switches and gadgets to make this thing work - but hey, I like switches!! ... and I need more gauges too... . hmmm, what can I tap in to... well, that's the fun part.
- Gonzo
See my ideas in the other thread. 
