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Old 12-15-2001, 07:53 AM   #1 (permalink)
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length: nv4500+np203+LC transfer-anyone done this?

Help?! I want to stuff a nv4500&doubler behind my chevy 350, the motor is in and I have the tranny, but b4 I go pulling the existing stock three speed drivetrain out, I need a plan.

I know tons of folks are running doublers in FJ40's but what about behind a nv4500(its long)? In an effort to save a little $$, I would like to simply put the tranny coupled to a np203 range box between my existing motor and and toyota transfer. I have seen people mate the 203 to the toy transfer so I know it can be done but few people seem to run that option. Why? Am I missing something? Is it the length?

Anybody done this? Is there a better option?
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Old 12-15-2001, 12:52 PM   #2 (permalink)
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doublers

The 203 with adapters at both ends is 10.4", but you probably will be able to bolt directly to the 4500 adapter and have a net length of ~8.5" if you use a 4500 with a rounds 6 bolt pattern on the rear, obviously call Advance Adapters.
AA's Rock Box, unavilable till march, will be 5" long and bolt to a NV4500 10 spline adapter. Ratio will be 3.44
The Klune reducer, ratio 2.73 or 4.0 is 9.4" with adapters.
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Old 12-15-2001, 07:45 PM   #3 (permalink)
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Keep in mind the length the cost, and the weight. Not to mention that three speed case will get turned in to mash potatoes behind that reduction, then it will break in half.

Remember you don't need an adapter for the atlas 2 behind an nv4500. and in the end an atlas would not cost much more, not to mention the unlimitid benifits strength, gearing and shifting optoins the atlas alows.

I have seen the set-up you are talking about and every time i say to myselg WHY.

just my .02

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Old 12-16-2001, 11:06 AM   #4 (permalink)
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Atlas?

What about the fact that the Atlas has a centered rear output?
Re breaking transfer cases with torque reduction: one time, in 1976, when I was a student in SF, I put my FJ40 against a cement retaining wall in low 1st and let the clutch out. 1st was 6.06 (NP540 5spd), low range 2.31, tires Michelin 10R16.5s, motor Perkins 4.236 diesel (LOTS of torque at idle). The wheels spun; no lockers at that time. The transfer case didn't break. I have seen the results of broken transfer cases, rarely, but normally all low gearing does is preserve the drivetrain by minimizing shock loads. I'm just a "newbie", I've only been 4 wheeling in Land Cruisers since 1969.
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Last edited by Charles Aarons; 12-16-2001 at 11:14 AM.
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Old 12-17-2001, 09:17 AM   #5 (permalink)
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Thanks for the advice guys.

I already have the NV4500 and the toy transfer is in the truck. I was thinking that a 203 would be easy to scavenge and if the toy transfer were to grenade down the road I could just replace it with a ORD doubler &205.

I will definately look into the atlas before I procede. Can anyone tell me more about the AA rock box?
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Old 12-17-2001, 10:02 PM   #6 (permalink)
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If you can get a custom made adaptor you only add about 2.5 " over the stock nv4500 adaptor but still Length is usally the factor in this setup lift must be considered also you can flip the rear springs and do some body trimming and might get by
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