t-case rumble - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ryanroo · 05-12-2005, 11:19 PM

i have a np205 in my truck behind a NV4500. it is fairly quiet about 60 or so but around 70+ MPH it gets pretty growly. it quiets down if you put a little pressure on the shifter. is this in the shifter and the bushing or the actual gearcase? any idea of how to quiet it down. also i have no shifter boot right now, just an old pair of shorts plugging the hole. thanks
Ryan

1969 GMC · 05-13-2005, 02:15 AM

Ryan, when my truck ran both the 465 and the 221's shifters would make noises. I'd usually lean my leg against them to make it stop, but I have seen people wrap pipe insulation around them before, and it works pretty good (buddy's '79 F250 w/ NP435 and NP205 has it).

Americanrider · 05-13-2005, 04:36 AM

"i have no shifter boot right now, just an old pair of shorts plugging the hole." LMAO

Get a bigger pair of drawers? Sorry, had to dig on you for that one.... My whole truck would growl at 60-70 and no telling where all the noise would come from.

Are you running synthetic fuilds or just 80-90? Was that 205 twin-sticked by chance? I also would look at the shifter bushings, maybe throw some nylon washers in there if there is slop.

ryanroo · 05-17-2005, 10:58 PM

Thanks for the responses. the t-case isn't twin sticked. i htink my problem lies in the busing in the shifter, there is a lot of slop in the shifter, so i think some brass or nylon washers are in order. i have an extra bracket for the NV4500/205 combo from AA so i might try to fab up a replacement pivot point that is better bushed, so to alieviate the noise. thankfully the truck is quiet and smooth other than the shifter, all the way up to 80-85 on the freeway

oh yeah, it has synthetic castrol gear oil in the t-case

Ryan

mrein3 · 05-18-2005, 12:56 PM

If I'm on a road trip I put a work glove or a chopper over the shifter. Around town I just deal with it.

I made some nylon bushings but unless I just pumped it up with grease it makes noise.

05-12-2005, 11:19 PM	#1
ryanroo Senior Member Join Date: Apr 2004 Location: sw colorado Posts: 2,720	t-case rumble i have a np205 in my truck behind a NV4500. it is fairly quiet about 60 or so but around 70+ MPH it gets pretty growly. it quiets down if you put a little pressure on the shifter. is this in the shifter and the bushing or the actual gearcase? any idea of how to quiet it down. also i have no shifter boot right now, just an old pair of shorts plugging the hole. thanks Ryan __________________ 72 K20 12v build 72 K20 "parts truck" A place for your diesel swap questions Last edited by ryanroo; 05-12-2005 at 11:20 PM.

05-13-2005, 02:15 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Ryan, when my truck ran both the 465 and the 221's shifters would make noises. I'd usually lean my leg against them to make it stop, but I have seen people wrap pipe insulation around them before, and it works pretty good (buddy's '79 F250 w/ NP435 and NP205 has it). __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

05-17-2005, 10:58 PM	#4
ryanroo Senior Member Join Date: Apr 2004 Location: sw colorado Posts: 2,720	Thanks for the responses. the t-case isn't twin sticked. i htink my problem lies in the busing in the shifter, there is a lot of slop in the shifter, so i think some brass or nylon washers are in order. i have an extra bracket for the NV4500/205 combo from AA so i might try to fab up a replacement pivot point that is better bushed, so to alieviate the noise. thankfully the truck is quiet and smooth other than the shifter, all the way up to 80-85 on the freeway oh yeah, it has synthetic castrol gear oil in the t-case Ryan __________________ 72 K20 12v build 72 K20 "parts truck" A place for your diesel swap questions

05-18-2005, 12:56 PM	#5
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	If I'm on a road trip I put a work glove or a chopper over the shifter. Around town I just deal with it. I made some nylon bushings but unless I just pumped it up with grease it makes noise. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

05-13-2005, 04:36 AM	#3
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	"i have no shifter boot right now, just an old pair of shorts plugging the hole." LMAO Get a bigger pair of drawers? Sorry, had to dig on you for that one.... My whole truck would growl at 60-70 and no telling where all the noise would come from. Are you running synthetic fuilds or just 80-90? Was that 205 twin-sticked by chance? I also would look at the shifter bushings, maybe throw some nylon washers in there if there is slop.



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