Hypothetically speaking, what would happen if...

[Manhattan]

After almost 4 years of planning, building, procrastinating, building... the prospects of actually driving the Jeep are in sight. For the past 3 months, the CJ has been at ACC in Atlanta (Scottdale actually) for final assembly. As they were assembling the TPI, computer, etc. we joked about the horsepower the Jeep now has compared to when it left the factory in '81. And we wondered...

Given the following, what would happen if...
- Fresh SMC (est. 325hp)
- Rebuilt SM465
- Rebuilt Dana 300
- Rebuilt Model 20 with Moser 1-piece shafts, Detroit lockers, 4.56 gears
- New BFG 35" MTs
... I put it in two-high, second gear (1st street gear in SM465), tach'ed it to 4,500 rpm - and stepped off the clutch?

Predictions?

 

[Posi]

- New BFG 35" MTs
Predictions?

Not so new looking rear BFG

 

[Old Dog]

no more AMC20
You going to tell us whos right when you do it.

 

[Kane]

The model 20 will go boom. More than likely the dif housing will spin on the tubes first then go boom. A good chance the output shaft housing of the Dana 300 will explode as well since it is the weak link on that trasfer case.

 

[CJ007]

I say spring wrap, broken u joint or twisted drive shaft. The AMC20 might spin a tube and assist in the above but should hold up fine.

 

[Manhattan]

I say spring wrap, broken u joint or twisted drive shaft. The AMC20 might spin a tube and assist in the above but should hold up fine.

^That^ was what I told the guys at the shop I thought would happen.

 

[CJ007]

I wrapped mine with spring under and not even close to the HP. Always broke u joints, twisted a couple drive shafts, broke ears of yokes, etc.

When I did spring over and regeared to 4.56 it added to it and I could feel the springs actually flexing while in 2wd. Just moving it around in the driveway.

I know lots don't want to do, but I added a ladder/traction bar and it was an amazing difference. Have been on 3 or 4 pretty gnarly runs but have not broken a thing as of yet or experienced loss or articulation as some mention. I did build mine with a heim at the front though and am pretty meticulous about researching and trying to do things right the first time.

I don't have high HP but do have decent torque with 75.5 final crawl ratio.

 

[3QuarterTon CJ]

I know for a fact the Dana 300 will pop I've popped a few doing the same thing, and I have less horses. The drive shaft will follow the output shaft down the street too.

And if you're lucky you won't punch a driveshaft sized hole in the floor of your nice otherwise flawless fiberglass tub like I did.

I wish you the best of luck in your clutch dumping endeavors, they are fun but expensive.

 

[Manhattan]

Sadly... the "hypothetically" part of my post is just that... I KNOW there's no way that backend of my drive train can handle the motor on the pavement - dumping the clutch anyway. Nice rolling starts for me.