3:1 low gear kit for NP205... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dale DuBose · 03-14-2003, 12:48 PM

I just swapped my 203 for a 205. I put a twin stick shifter on it from Currie. The sticks are for a D300 t-case but you can adapt it to a 205. I clocked it level too for more clearence. I heard that someone was making a 3:1 low kit for them but its not out yet. Have any of you heard about this? Do you know who is making it?

Blazer1970 · 03-14-2003, 12:55 PM

No, no one is making a low gear kit for the 205. A couple of companies have talked about it, but IMO you will never see it. There is not enough room in the case for it.

Dale DuBose · 03-14-2003, 02:32 PM

The D300 and Atlas t-cases are small too, but they have them. It may never come to be, but it would be nice.

Bill W · 03-14-2003, 04:04 PM

The doubler kit gets you a 4-1 low ratio. Anything wrong with that kit?

Bill

Dale DuBose · 03-14-2003, 05:32 PM

Do you mean two cases or using a 203 low range. Those work fine, but I have a short wheelbase and those are not an option for me. The np203 was almost to long. By switching to the np205 I was able to lengthen my rear driveshaft 6ins, as well as getting a better t-case.

Blazer1970 · 03-17-2003, 09:40 AM

There are a lot of people running 203/205 doublers in Blazers. Driveshaft length should not be a problem on a pickup.

Dale DuBose · 03-17-2003, 02:00 PM

Thats the problem. You see I have a Jeep, with a 350, th350, np205, gm12bolt and gm10bolt. I have no room for two t-cases. I plan to swap my 12bolt/10bolt for a 14bolt/d60. Anyone want to buy a 12bolt rear w/ 4.56s and a spool or a 10bolt front w/4.56s and a lockright locker.

Mike C · 03-17-2003, 02:43 PM

Have you thought about moving to a TH700R4 or a low gear set for your TH350? Even easier would be an SM420 or 465 granny unless you have to have the auto. The manual trans are significantly shorter than the autos as well. With the 465 you could probably run the 203 doubler and not increase length. Right now you have 2.52*1.96*4.56 or 22.57 craw ratio overall first, and the 3.08 first gear of the TH700 would give you a 3.08*1.96*4.56 or 27.52 while the TH350 and a 3:1 2.52*3.0*4.56 is only 34.47. The OD trans gets you half way there at least AND an overdrive. Then you can go to 4.88 or 5.13. With the 88's and the 700, you have 3.08*1.96*4.88 or 29.45 overall first. The 5.13 are 30.96, not enough gain for the trouble IMO.

But for comparison, my Jimmy with the 465/205/4.10 is 52.56. And the SM 420 has a 7.05 first gear compared to the 465s 6.54.

03-14-2003, 12:48 PM	#1
Dale DuBose Registered User Join Date: Oct 2002 Posts: 27	3:1 low gear kit for NP205... I just swapped my 203 for a 205. I put a twin stick shifter on it from Currie. The sticks are for a D300 t-case but you can adapt it to a 205. I clocked it level too for more clearence. I heard that someone was making a 3:1 low kit for them but its not out yet. Have any of you heard about this? Do you know who is making it? __________________ I need all the help I can get.

03-14-2003, 12:55 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	No, no one is making a low gear kit for the 205. A couple of companies have talked about it, but IMO you will never see it. There is not enough room in the case for it. __________________ Tim

03-14-2003, 02:32 PM	#3
Dale DuBose Registered User Join Date: Oct 2002 Posts: 27	The D300 and Atlas t-cases are small too, but they have them. It may never come to be, but it would be nice. __________________ I need all the help I can get.

03-14-2003, 05:32 PM	#5
Dale DuBose Registered User Join Date: Oct 2002 Posts: 27	Do you mean two cases or using a 203 low range. Those work fine, but I have a short wheelbase and those are not an option for me. The np203 was almost to long. By switching to the np205 I was able to lengthen my rear driveshaft 6ins, as well as getting a better t-case. __________________ I need all the help I can get.

03-17-2003, 09:40 AM	#6
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	There are a lot of people running 203/205 doublers in Blazers. Driveshaft length should not be a problem on a pickup. __________________ Tim

03-14-2003, 04:04 PM	#4
Bill W Registered User Join Date: Mar 2003 Location: Oregon Posts: 229	The doubler kit gets you a 4-1 low ratio. Anything wrong with that kit? Bill

03-17-2003, 02:00 PM	#7
Dale DuBose Registered User Join Date: Oct 2002 Posts: 27	Thats the problem. You see I have a Jeep, with a 350, th350, np205, gm12bolt and gm10bolt. I have no room for two t-cases. I plan to swap my 12bolt/10bolt for a 14bolt/d60. Anyone want to buy a 12bolt rear w/ 4.56s and a spool or a 10bolt front w/4.56s and a lockright locker. __________________ I need all the help I can get.

03-17-2003, 02:43 PM	#8
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Have you thought about moving to a TH700R4 or a low gear set for your TH350? Even easier would be an SM420 or 465 granny unless you have to have the auto. The manual trans are significantly shorter than the autos as well. With the 465 you could probably run the 203 doubler and not increase length. Right now you have 2.521.964.56 or 22.57 craw ratio overall first, and the 3.08 first gear of the TH700 would give you a 3.081.964.56 or 27.52 while the TH350 and a 3:1 2.523.04.56 is only 34.47. The OD trans gets you half way there at least AND an overdrive. Then you can go to 4.88 or 5.13. With the 88's and the 700, you have 3.081.964.88 or 29.45 overall first. The 5.13 are 30.96, not enough gain for the trouble IMO. But for comparison, my Jimmy with the 465/205/4.10 is 52.56. And the SM 420 has a 7.05 first gear compared to the 465s 6.54. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax



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