np205 shifter jump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dale99 · 05-14-2013, 05:45 PM

So I noticed when my np205 is in 4low, fronts locked in, and I make a turn the shifter jumps. It did this so much that it kicked the front out of 4low, but left the rear in 4low. This is still with the stock setup, not a twin stick.

Is this normal, or something wrong?

BIG V · 05-14-2013, 06:42 PM

Check your transfercase mounts. If its bouncing that much also verify the ratios match.
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Dale99 · 05-14-2013, 09:54 PM

which mounts as I just put it in there?

4hi does not do this, and 4low strait line does not do this. If gears where miss-matched, wouldnt it show then as well?

Redcap · 05-14-2013, 09:58 PM

Check for cracks in your adapter too.

BIG V · 05-14-2013, 09:59 PM

When turning there is a certain amount of driveline wrap up due to tires on all 4 corners going different speeds. Thos would cause stress on all the mounts and if there is a bad one move the shifter against the body in the shifter hole and disengauge the front. However if your transfercase is giving you 2wd low there is a internal problem with your transfercase. Lets inspect both motor mounts and all transfercase mounts to first rule that out.
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Dale99 · 05-14-2013, 10:18 PM

All new mounts and adapters.

btw, I'm talking forwards/backwards movement. Not left to right.

**CUSTOM/10** · 05-14-2013, 10:27 PM

Are you doing this on pavement ?
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obijuan · 05-14-2013, 10:29 PM

Shift collars have teeth that are worn out. Been jammed into gear alot and rounded the teeth off of the collar or the shaft side of it. They are now "ramped" so to say.

That is one potential issue.
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Dale99 · 05-15-2013, 06:44 AM

custom10, no dirt in my friends back yard

burnin oil · 05-15-2013, 08:06 AM

Sounds internal. If you engauge 4x4 and just drive straight does it stay in gear? If it is still jumping out the poppet ball/springs on the shifter rail could be worn also. Had this issue on a NP205 years ago. Lock it in gear and a second or two later it would jump back out. Almost like a bad syncro/dog assembly in a transmission.

Dale99 · 05-15-2013, 10:06 AM

Going strait it seemed to stay. The ball/poppet your talking about is under the plugs on the top of the tc correct?

The top rod is also front driveshaft correct?

obijuan · 05-15-2013, 10:11 AM

Top rail is rear. Lower is front. The rails shift the output theyre closest to.
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burnin oil · 05-15-2013, 11:11 AM

Quote:

Originally Posted by Dale99

Going strait it seemed to stay. The ball/poppet your talking about is under the plugs on the top of the tc correct?

The top rod is also front driveshaft correct?

Sure are. They function as a locking mechanism to hold the shift rails in the correct location on the detents. When the spring looses tension the rails become free to bounce around and jump out of gear.

Dale99 · 05-15-2013, 12:10 PM

thanks obijuan

burnin oil. Then I would guess the springs are worn/collapsed. Or atleast thats part of the problem then.

obijuan · 05-15-2013, 01:31 PM

Or the rail itself has a groove worn in it from the detent ball.
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Dale99 · 05-15-2013, 02:43 PM

Would I beable to see that when its pulled in the outmost position(4hi?)?

obijuan · 05-15-2013, 02:55 PM

To see the wear? No that stays in the case.
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burnin oil · 05-16-2013, 09:23 AM

I think the rail could have all kinds of wear and still function fine as long as the seal surface is good. the poppet springs are really nothing more than an over sized bic pen spring. Like said before this may not be the problem and it could be internal.

05-14-2013, 05:45 PM	#1
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	np205 shifter jump? So I noticed when my np205 is in 4low, fronts locked in, and I make a turn the shifter jumps. It did this so much that it kicked the front out of 4low, but left the rear in 4low. This is still with the stock setup, not a twin stick. Is this normal, or something wrong? __________________ 2008 Sierra k3500 LMM 1994 s10 blazer 4x4 1991 Camaro Vert Rusted in Half RIP 1972 Jimmy 4x4 L05,4L60E,np205http://67-72chevytrucks.com/vboard/s...d.php?t=546364 1967 C10 L6/3tree(dads truck)

05-14-2013, 06:42 PM	#2
BIG V Registered User Join Date: Jul 2009 Location: Northern California Posts: 411	Re: np205 shifter jump? Check your transfercase mounts. If its bouncing that much also verify the ratios match. Posted via Mobile Device __________________ 1991 Chevy suburban 3/4 ton 4x 4:56 and pulls great 1979 Chevy 1/2 ton long bed diesel 1974 Chevy crew cab short bed 3/4 ton 4x4 project 1991 Chevy suburban 2wd 1984 Chevy suburban 3/4 ton 4x 6.5 detroit with turbo 1961 Chevy pickup 1/2 ton 2wd 1975 gmc crew cab short bed 2wd

05-14-2013, 09:54 PM	#3
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? which mounts as I just put it in there? 4hi does not do this, and 4low strait line does not do this. If gears where miss-matched, wouldnt it show then as well?

05-14-2013, 09:58 PM	#4
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: np205 shifter jump? Check for cracks in your adapter too. __________________ '77 K35 - 454, SM465/NP205, 4.56 D60/14bFF

05-14-2013, 09:59 PM	#5
BIG V Registered User Join Date: Jul 2009 Location: Northern California Posts: 411	Re: np205 shifter jump? When turning there is a certain amount of driveline wrap up due to tires on all 4 corners going different speeds. Thos would cause stress on all the mounts and if there is a bad one move the shifter against the body in the shifter hole and disengauge the front. However if your transfercase is giving you 2wd low there is a internal problem with your transfercase. Lets inspect both motor mounts and all transfercase mounts to first rule that out. Posted via Mobile Device __________________ 1991 Chevy suburban 3/4 ton 4x 4:56 and pulls great 1979 Chevy 1/2 ton long bed diesel 1974 Chevy crew cab short bed 3/4 ton 4x4 project 1991 Chevy suburban 2wd 1984 Chevy suburban 3/4 ton 4x 6.5 detroit with turbo 1961 Chevy pickup 1/2 ton 2wd 1975 gmc crew cab short bed 2wd

05-14-2013, 10:18 PM	#6
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? All new mounts and adapters. btw, I'm talking forwards/backwards movement. Not left to right.

05-14-2013, 10:27 PM	#7
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,857	Re: np205 shifter jump? Are you doing this on pavement ? Posted via Mobile Device __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859

05-14-2013, 10:29 PM	#8
obijuan Registered User Join Date: Jun 2012 Location: cibolo tx Posts: 1,033	Re: np205 shifter jump? Shift collars have teeth that are worn out. Been jammed into gear alot and rounded the teeth off of the collar or the shaft side of it. They are now "ramped" so to say. That is one potential issue. Posted via Mobile Device

05-15-2013, 06:44 AM	#9
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? custom10, no dirt in my friends back yard

05-15-2013, 08:06 AM	#10
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: np205 shifter jump? Sounds internal. If you engauge 4x4 and just drive straight does it stay in gear? If it is still jumping out the poppet ball/springs on the shifter rail could be worn also. Had this issue on a NP205 years ago. Lock it in gear and a second or two later it would jump back out. Almost like a bad syncro/dog assembly in a transmission.

05-15-2013, 10:06 AM	#11
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? Going strait it seemed to stay. The ball/poppet your talking about is under the plugs on the top of the tc correct? The top rod is also front driveshaft correct?

05-15-2013, 10:11 AM	#12
obijuan Registered User Join Date: Jun 2012 Location: cibolo tx Posts: 1,033	Re: np205 shifter jump? Top rail is rear. Lower is front. The rails shift the output theyre closest to. Posted via Mobile Device

05-15-2013, 12:10 PM	#14
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? thanks obijuan burnin oil. Then I would guess the springs are worn/collapsed. Or atleast thats part of the problem then.

05-15-2013, 01:31 PM	#15
obijuan Registered User Join Date: Jun 2012 Location: cibolo tx Posts: 1,033	Re: np205 shifter jump? Or the rail itself has a groove worn in it from the detent ball. Posted via Mobile Device

05-15-2013, 02:43 PM	#16
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: np205 shifter jump? Would I beable to see that when its pulled in the outmost position(4hi?)?



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05-15-2013, 02:55 PM	#17
obijuan Registered User Join Date: Jun 2012 Location: cibolo tx Posts: 1,033	Re: np205 shifter jump? To see the wear? No that stays in the case. Posted via Mobile Device

05-16-2013, 09:23 AM	#18
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: np205 shifter jump? I think the rail could have all kinds of wear and still function fine as long as the seal surface is good. the poppet springs are really nothing more than an over sized bic pen spring. Like said before this may not be the problem and it could be internal.

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