JB Conversions' New LoMax NP205 with 3:1 Low Range - The 1947 - Present Chevrolet & GMC Truck Message Board Network

4x4Poet · 02-19-2006, 10:00 PM

In case you want the best NP205 transfer case available:

JB Conversions LoMax 205

Low range is 3 to 1 in a new NP205 style case with stouter gears! Super low range with no driveshaft changes needed. 32-spline versions are in stock and shipping but 10-spline input gears are in production. Figure 8 vs. round bolt pattern issues are also addressed. We all know that an NP205 is tough, but look at the size of those LoMax gears in comparison to stock NP205 gears! I'm computer illiterate, so would someone please post a comparison of the gear sizes. Or any pic you please. TIA.

Start dreaming and saving.

1967k30 · 02-20-2006, 12:26 AM

They sound cool,but I'm not sure if I can justify them

.Looks like I'll run a 203/205 doubler

,or at least that's the current plan.

4x4Poet · 02-20-2006, 12:31 AM

Quote:

Originally Posted by 1967k30

They sound cool,but I'm not sure if I can justify them

...

Yeah, as with most great auto upgrades, the price kills. Still, that gear set says, "Go ahead. Stick me behind a CTD."

**Zoomad75** · 02-20-2006, 01:41 AM

The size of the gears is why you can't use the stock case.

MrBinAz · 02-22-2006, 01:02 AM

4x4Poet · 02-22-2006, 07:08 AM

Thanks, MrBinAz.

Drool, droool, drooooool....

1967k30 · 02-22-2006, 11:05 AM

Quote:

Originally Posted by 4x4Poet

Yeah, as with most great auto upgrades, the price kills. Still, that gear set says, "Go ahead. Stick me behind a CTD."

My brother could sure test them in his CTD powered 67' K20

. It'll probably get a 203/205 behind it though.

Chris_T · 02-22-2006, 11:20 AM

Why not both? A 205/205 gives 1:1, 2:1 and 4:1 (2:1 x 2:1). With that gearset in the 205 a doubler gives you 1:1, 2:1, 3:1 and 6:1 .. after all, it's not MY money

1969 GMC · 02-22-2006, 07:42 PM

Quote:

Originally Posted by Chris_T

Why not both? A 205/205 gives 1:1, 2:1 and 4:1 (2:1 x 2:1). With that gearset in the 205 a doubler gives you 1:1, 2:1, 3:1 and 6:1 .. after all, it's not MY money

I'm pretty sure you can get a 3:1 kit for the 203 range box from Wagoner Machine Shop for less money. The 3:1 205 is pretty bling, but...expensive.
That's what I would do if I was in the market for a doubler...but I'm not.
I offroaded just fine with a SM465 and Rockwell T221 (well, til it exploded) and didn't ever want to go lower. Unless I move to Colorado or Arizona, and have rocks to crawl on, lol.

1967k30 · 02-22-2006, 10:08 PM

You are correct WMS does have a 3:1 for the 203.Just imagine the possibilities. 3:1 203 and 3:1 205.That would be cool.WMS also offers a 203/203/205 setup. Which if all were setup with 3:1's it would be insane. Just a though.

**special-K** · 02-23-2006, 11:36 AM

I`m too poor.The best I can do is a NV4500/NP241 and 4.56 axles.Which I have laying around,just need to start building that one.Well,first I have to swap a 208 into my`90 Blazer so I can rob the r/h 241.

1969 GMC · 02-23-2006, 07:51 PM

Why? Just save some time and leave the 241 under the Blazer and just use the 208 behind the 4500. The difference in low range (to me) wouldn't be enough to justify a swap.

Chris_T · 03-01-2006, 11:35 AM

Quote:

Originally Posted by 1969 GMC

I'm pretty sure you can get a 3:1 kit for the 203 range box from Wagoner Machine Shop for less money. The 3:1 205 is pretty bling, but...expensive.

Good point.

Kind of interesting to think about the difference between stacking a 2:1 and 3:1 gearset in either order.

For instance: Does a 3:1 rangebox put more stress on a stock 205? Would you be better with a 2:1 rangebox and a stronger 3:1 gearset in the 205? or if you'd rather not twin-stick your 205, would you like 2:1 or 3:1 2wd low from the rangebox?

All pretty academic to me since I moved and decided to restore my '72, but interesting to think about nonetheless ....

454_72_4X4 · 03-14-2006, 01:10 PM

Quote:

Originally Posted by Chris_T

Good point.

Kind of interesting to think about the difference between stacking a 2:1 and 3:1 gearset in either order.

For instance: Does a 3:1 rangebox put more stress on a stock 205? Would you be better with a 2:1 rangebox and a stronger 3:1 gearset in the 205? or if you'd rather not twin-stick your 205, would you like 2:1 or 3:1 2wd low from the rangebox?

All pretty academic to me since I moved and decided to restore my '72, but interesting to think about nonetheless ....

I agree with the interesting part. Alot of things to think about when you start thinking about it...

I guess I need to go watch the crawlers someday. I very, very seldom use low range in my stock 205 let alone go lower yet!
My theory is "build a bigger engine"! Hahaha

4x4Poet · 03-16-2006, 03:31 AM

Besides having greater strength for handling the binding that comes from full lockers front and rear, the beauty of the LoMax NP205 gear set is the crawl ratio. With an SM465:

1st 6.32 x 3:1 xfer x 4.11 R&P = 77.9 final crawl ratio.

78 to 1 makes ample gearing "room" for over 35" tires.

Compare with stock crawl ratio:

6.32 x 1.96 x 4.11 = 50.1

Less weight, too. Expect less driveshaft breakage & u-joint wear than with doublers since a rear driveshaft behind a LoMax alone is longer and has less severe operating angles than driveshafts behind doublers.

Anyway, no one's going to talk me out of getting one.

smokekiki · 03-16-2006, 11:21 AM

Anyone call for a price on one?

454_72_4X4 · 03-16-2006, 11:30 AM

Now that I've read the whole article about it, it does seem like an excellent product.
I like the dual, (round and figure 8), mounting positions. And the big bearing 32 spline input is nice since 205's with that input arrangement are getting hard to come by.
The 3:1 gearset has it place I guess. For you crawler guys it'd be great, (or at least a big improvement over the stock 1.96:1).

I think they should've left the PTO plate on there too though.

Now for the big question, Price?

1967k30 · 03-16-2006, 02:48 PM

They're $1300

. It's too bad they are so high.

4x4Poet · 03-18-2006, 07:19 AM

Quote:

Originally Posted by 1967k30

They're $1300

. It's too bad they are so high.

Actually, that's reasonable for what they are. Stronger and lower than stock ratio NP205 gear sets with a new case that fits both round and figure 8 pattern mounting.

Ok, the LoMax is very expensive. I wish they weren't so high, also. Maybe they'll come down a little if volume sales start.

Edit: Hehe. Volume sales @ $1300 a pop! I crack myself up.

02-19-2006, 10:00 PM	#1
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	JB Conversions' New LoMax NP205 with 3:1 Low Range In case you want the best NP205 transfer case available: JB Conversions LoMax 205 Low range is 3 to 1 in a new NP205 style case with stouter gears! Super low range with no driveshaft changes needed. 32-spline versions are in stock and shipping but 10-spline input gears are in production. Figure 8 vs. round bolt pattern issues are also addressed. We all know that an NP205 is tough, but look at the size of those LoMax gears in comparison to stock NP205 gears! I'm computer illiterate, so would someone please post a comparison of the gear sizes. Or any pic you please. TIA. Start dreaming and saving. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 02-19-2006 at 10:01 PM.

02-20-2006, 12:26 AM	#2
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range They sound cool,but I'm not sure if I can justify them .Looks like I'll run a 203/205 doubler ,or at least that's the current plan. __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.

02-20-2006, 01:41 AM	#4
Zoomad75 K5Camper Join Date: Mar 2004 Location: Pueblo, CO Posts: 1,513	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range The size of the gears is why you can't use the stock case. __________________ Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper

02-22-2006, 01:02 AM	#5
MrBinAz Registered User Join Date: Dec 2004 Location: Where the hell is Bullhead City, Az? (USA) Posts: 55	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range __________________ -----the fleet----- '72 K20 Chevy Suburban '72 Datsun 510 (vintage racer) '89 Honda Civic Si HB '89 Honda Civic Dx HB '08 Honda Element EX-P '78 Honda Express (50cc. pit-ped) pix here

02-22-2006, 07:08 AM	#6
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Thanks, MrBinAz. Drool, droool, drooooool.... __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

02-22-2006, 11:20 AM	#8
Chris_T Registered User Join Date: May 2003 Location: Saskatoon, SK Posts: 44	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range Why not both? A 205/205 gives 1:1, 2:1 and 4:1 (2:1 x 2:1). With that gearset in the 205 a doubler gives you 1:1, 2:1, 3:1 and 6:1 .. after all, it's not MY money

02-22-2006, 10:08 PM	#10
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range You are correct WMS does have a 3:1 for the 203.Just imagine the possibilities. 3:1 203 and 3:1 205.That would be cool.WMS also offers a 203/203/205 setup. Which if all were setup with 3:1's it would be insane. Just a though. __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.

02-23-2006, 11:36 AM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range I`m too poor.The best I can do is a NV4500/NP241 and 4.56 axles.Which I have laying around,just need to start building that one.Well,first I have to swap a 208 into my`90 Blazer so I can rob the r/h 241. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

02-23-2006, 07:51 PM	#12
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range Why? Just save some time and leave the 241 under the Blazer and just use the 208 behind the 4500. The difference in low range (to me) wouldn't be enough to justify a swap. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

03-16-2006, 03:31 AM	#15
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Besides having greater strength for handling the binding that comes from full lockers front and rear, the beauty of the LoMax NP205 gear set is the crawl ratio. With an SM465: 1st 6.32 x 3:1 xfer x 4.11 R&P = 77.9 final crawl ratio. 78 to 1 makes ample gearing "room" for over 35" tires. Compare with stock crawl ratio: 6.32 x 1.96 x 4.11 = 50.1 Less weight, too. Expect less driveshaft breakage & u-joint wear than with doublers since a rear driveshaft behind a LoMax alone is longer and has less severe operating angles than driveshafts behind doublers. Anyway, no one's going to talk me out of getting one. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 03-16-2006 at 03:32 AM.

03-16-2006, 11:21 AM	#16
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,473	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range Anyone call for a price on one? __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

03-16-2006, 11:30 AM	#17
454_72_4X4 Registered User Join Date: Apr 2004 Location: N.E. MO Posts: 1,749	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range Now that I've read the whole article about it, it does seem like an excellent product. I like the dual, (round and figure 8), mounting positions. And the big bearing 32 spline input is nice since 205's with that input arrangement are getting hard to come by. The 3:1 gearset has it place I guess. For you crawler guys it'd be great, (or at least a big improvement over the stock 1.96:1). I think they should've left the PTO plate on there too though. Now for the big question, Price? __________________ 72 C20 4X4 454 4 speed 89 Trans Am (was) 305 TPI 700r4 93 C1500 2wd Extended cab 350 700r4 98 Sonoma (TPI outa the Trans Am) 03 Yamaha 660 Raptor 03/04 660 Raptor 07 700 Raptor 85 Honda Odyssey

03-16-2006, 02:48 PM	#18
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: JB Conversions' New LoMax NP205 with 3:1 Low Range They're $1300 . It's too bad they are so high. __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.



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