MJ Prerunner Thread

[DieselSJ]

Yeah, 6.15's. Try to pull a long sandy wash with those 3.73's and see how far you get before 1)engine overheats, 2) transmission overheats, 3) you bog down and get stuck, and 4) everyone else in the class passes you. In 1700, the engines just do not have enough power to pull a 4.88 or higher gear. We have mid-5's for gearing and we are still down in 1st gear floored on the rev limiter in some of the deep soft uphill stuff because it won't pull 2nd gear. Remember that our average race speed is 35-40 mph and rarely are we doing over 50. Gear it so the engine is in the powerband most of the time.

And yeah, the lunchbox is not going to be happy.

 

[crazyjim]

How about some 3.73 street gears with a 2 lo kit from terra? I run in 4lo every once in a while, it's nice to have the extra umph

 

[Philprof]

why do ya need to be geared so low for jeepspeed? i've been able to do everything i've wanted to do with my 3.73's, as far as crawley wheelin, and jumping dunes and whatnot... i'm running 32's with a 4.0/ax15/np231 i know ya wanna keep the rpm's up, and i know the takeoff is better with lower gears, and don't get me wrong, i haven't raced anything in my xj except ricers on the street, and a few other jeeps, but nothing like full blown jeepspeed yet. i'm also running a luchbox locker, is it gonna kerplode?
edit: my bad, by the time i got this far i forgot this was the mj thread, but yeah, 6.15's?

No worries on the hijack...its all stuff I need to know.

 

[Philprof]

How about some 3.73 street gears with a 2 lo kit from terra? I run in 4lo every once in a while, it's nice to have the extra umph

racing in 2/4lo? I can't get my head around that....

 

[tbburg]

Our 7100(that's not a miss-print, it's BITD 7100 stock mini truck) is geared to 4.56, with a spool(Dana 44) Derrick wants to put 4.88s in it, or possibly lower. The 4.0 can live and breathe all day at 4500rpm, without stressing anything inside it. Our average race speeds are in the high 20s. (with bursts over 60, and one memorable occasion where we may have hit 100)

I'm sure you'll want a spool with a race only car.

Definately want the spool for a race truck.

why do ya need to be geared so low for jeepspeed? i've been able to do everything i've wanted to do with my 3.73's, as far as crawley wheelin, and jumping dunes and whatnot... i'm running 32's with a 4.0/ax15/np231 i know ya wanna keep the rpm's up, and i know the takeoff is better with lower gears, and don't get me wrong, i haven't raced anything in my xj except ricers on the street, and a few other jeeps, but nothing like full blown jeepspeed yet. i'm also running a luchbox locker, is it gonna kerplode?

In the dirt, racing, I don't think you can go to low. As for the lunchbox,.... probably should leave that at home. By the way, if you drop 4.10 in the axles, the rest of your drive train will love you for it.

How about some 3.73 street gears with a 2 lo kit from terra? I run in 4lo every once in a while, it's nice to have the extra umph

Wonder what kind of noise that would be making when you hit 50 in the flat parts,...

 

[chris_amrein]

How about some 3.73 street gears with a 2 lo kit from terra? I run in 4lo every once in a while, it's nice to have the extra umph

I know it's not exactly related, but I know of an old 2wd Toyota 7s that ran an underdrive unit (similar to 2 low) so that the rearend could run a numerically lower gear. The idea was it needed something like a 7.0 to 1 reaerend gear, but it would destroy pinion gears so the underdrive unit was added.

I don't hear of too many Jeepspeeds breaking 9 inch pinion gears. I've run 6 to 1 gears in my old Jeepspeed and never had a problem.

Chris

 

[thechief86]

thanks for lettin me know how things are in the dirt! i only have the 3.73's because they were free, and way better than the 3.07's. i obviously don't have the money to actually race my junk, but i do have fun in the dirt with it. i have the ax15 manual transmission, so it's geared a little lower than the autos. how do the ball joints on the hp dana 30's hold up to repeated jumps? i do play with mine pretty hard, cuz it's not my dd most of the time, but i don't like breakin stuff.

 

[DieselSJ]

How about some 3.73 street gears with a 2 lo kit from terra? I run in 4lo every once in a while, it's nice to have the extra umph

Even when we have the 4wd housing installed (we only run 4wd for 1 race), we don't have the front engaged all the time- we only engage it for the really soft slow stuff. The rest of the time we are running in 2hi. And I could not imagine running a tcase in low range for that long of a duration. That would build up some incredible heat.

And the last thing you want to do in a race is to STOP, put it in 4 low, get around the obstacle, then stop again and put it back into Hi. If we could legally run a xfer case that only had a high range, we would do it.

 

[tbburg]

...,And the last thing you want to do in a race is to STOP, put it in 4 low, get around the obstacle, then stop again and put it back into Hi. If we could legally run a xfer case that only had a high range, we would do it.

I think he meant get the 2-low kit from Tera, put it in 2-low(front axle disengaged) and drive it like that.

 

[DieselSJ]

I think he meant get the 2-low kit from Tera, put it in 2-low(front axle disengaged) and drive it like that.

Again, heat would kill it. And how would you disengage the front? Does the Tera kit let you run in 2wd low range? (sorry, not too familiar with the crawler stuff)

 

[Philprof]

I've been thinking more about the 8.8, considering you can find them with 4.10's, Limited Slip, and disk brakes, not a bad deal.

There are 8-10 explorers at the PYP on Beach and Ball Rd. Some with disc brakes.

 

[dakineJ]

There are 8-10 explorers at the PYP on Beach and Ball Rd. Some with disc brakes.

Do you know what $ they are asking ? 95' up would be ideal. Here are some links that might be useful.
http://www.therangerstation.com/tech_library/Explorer8_8.html
http://www.superioraxle.com/axles.html#super88
http://www.off-roadweb.com/tech/0911or_superior_axles_super_88_kit/index.html

 

[tbburg]

Again, heat would kill it. And how would you disengage the front? Does the Tera kit let you run in 2wd low range? (sorry, not too familiar with the crawler stuff)

The 2low kit adds a detent and shift position above the "4-low" position that allows the transfer case to operate in 2wd and low range. My guess is either heat takes it out and fries the bearings, or the planet assy. grenades. Any way around, my transfer case is loud at 30 in low. 'Can't imagine what one would sound like at 70.(maybe that noise a rabbit makes just before a fox rips it's head off?)

 

[Philprof]

Do you know what $ they are asking ? 95' up would be ideal. Here are some links that might be useful.
http://www.therangerstation.com/tech_library/Explorer8_8.html
http://www.superioraxle.com/axles.html#super88
http://www.off-roadweb.com/tech/0911or_superior_axles_super_88_kit/index.html

I don't know. but PYP is having a 50% off deal soon...may want to grab 3 or 4 :clap:

 

[dakineJ]

I don't know. but PYP is having a 50% off deal soon...may want to grab 3 or 4 :clap:

Well ya :thumbup:

 

[crazyjim]

Haha ya I have no idea how the 2low kit works, just an idea, guess not

 

[TJDualsport]

wheeling in 2 low in the dunes would be a blast..... haha