To much slop np205????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ed ke6bnl · 09-19-2005, 06:48 PM

I have a 205 TC in my 70 chevy 4x4, and when i move the yoke side to side there seems to some slop, but i am not shure if that is normal or not?? thanks for all the help james

badpeanut · 09-21-2005, 11:09 PM

I have a high mileage '71 with a NP205 and it has a noticable amount of slop when pushing on the truck when it is in park. I don't know if this was the case when it had fewer miles?

4x4Poet · 09-24-2005, 01:34 AM

Tough call over the net. IIRC, there is an acceptable amount of play measured in degrees of rotation, but I don't have my Chevy Service Manual handy. Off the cuff, I'd say anything less than 1/4" to maybe 3/8" movement of the yoke ears is probably OK. Without taking a measurement, excessive whine or clunking would probably be more telling of a need for a rebuild. And the adapter's spud shaft could be the culprit.

Gear wear is fairly rare in an NP205 that has had the oil changed often enough. Usually, the bearings wear first and allow the input/idler/output shafts to deflect excessively. Too much shaft deflection can accelerate gear teeth wear and tear since any deflection makes the gear teeth surfaces mate while out of alignment. Heavy or frequent towing can amplify the effect.

Though I have no business doing so, I recommend gearheads try rebuilding NP205s themselves. I've found the bearing and seal master rebuild kits for $125 at a bearing sales. A dial indicator is technically needed, but lots of wheelers do without.

*wolfthing2000* · 09-24-2005, 11:24 AM

The coupler from tranny to transfer is a big contributor to what you have.

09-19-2005, 06:48 PM	#1
Ed ke6bnl Registered User Join Date: Mar 2002 Location: Agua Dulce, Ca. usa Posts: 179	To much slop np205????? I have a 205 TC in my 70 chevy 4x4, and when i move the yoke side to side there seems to some slop, but i am not shure if that is normal or not?? thanks for all the help james __________________ Ed ke6bnl Agua Dulce 70 S.E. Los Angeles 70 Chevy short bed 1948 F3 ford pu 1949 F1 stock V8 flathead 3 on floor 1950 F1 pu street rod 1948 F6 Ford Dually/350sbc no bed stock trans&rear 1972 El Camino 4" chop 1953 Chevy 3100 2b daily driver 1970 SB 4X4 400ci 6in lift

09-21-2005, 11:09 PM	#2
badpeanut Not a bad nut after all.. Join Date: Dec 2000 Location: ND Posts: 1,759	I have a high mileage '71 with a NP205 and it has a noticable amount of slop when pushing on the truck when it is in park. I don't know if this was the case when it had fewer miles? __________________ '05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer

09-24-2005, 01:34 AM	#3
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Tough call over the net. IIRC, there is an acceptable amount of play measured in degrees of rotation, but I don't have my Chevy Service Manual handy. Off the cuff, I'd say anything less than 1/4" to maybe 3/8" movement of the yoke ears is probably OK. Without taking a measurement, excessive whine or clunking would probably be more telling of a need for a rebuild. And the adapter's spud shaft could be the culprit. Gear wear is fairly rare in an NP205 that has had the oil changed often enough. Usually, the bearings wear first and allow the input/idler/output shafts to deflect excessively. Too much shaft deflection can accelerate gear teeth wear and tear since any deflection makes the gear teeth surfaces mate while out of alignment. Heavy or frequent towing can amplify the effect. Though I have no business doing so, I recommend gearheads try rebuilding NP205s themselves. I've found the bearing and seal master rebuild kits for $125 at a bearing sales. A dial indicator is technically needed, but lots of wheelers do without. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. Last edited by 4x4Poet; 09-24-2005 at 01:39 AM.

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09-24-2005, 11:24 AM	#4
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	The coupler from tranny to transfer is a big contributor to what you have.



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