Somthing binding every once in a while? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chilly178 · 10-07-2018, 10:31 AM

Hello, I have a 72 C20 with a 350, SM465, and Eaton no spin rear end 4.10 with the locker. I have changed the fluid in the transmission and the rear end with Mobil 1 gear oil within the last few years. Also the engine is brand new. I haven't touched any of the u joints, carrier bearing, and never removed the diff cover. Once in a while I get some sort of binding or something where its kinda like a pop and the whole truck hesitates for a second then keeps going. Its one of those things where when your friends hear it they think you just blew something or hit a big pot hole then you tell them no it does that once in a while. I'm thinking it happens when I turn a corner for the most part. Seems like it could be possibly getting more frequent. Any ideas? It's gotta be in the drive line somewhere. Also my rear brakes are squealing now at very low speeds like a crawl and they sqeal when I hit the brakes, but not all the time. I just replaced the brake shoes (not the springs) and brake cylinders two years ago and I'm annoyed that I have an issue back there because taking the inner axles out to get the drums off is a pain. I tried backing up in reverse then stomping on the brakes but it didn't seem to help. I'm pretty sure it isn't the E brake because the cable was adjusted last spring and it doesn't seem to be dragging. I know there is an adjustment for the shoes you can get to without taking the drums off not sure if they need adjusting? Any ideas on my issues? I'm thinking that my rear end is gonna get torn apart this winter, which sucks becasue I need to rip into the front end and replace all those suspension components because its all really old. Owning an old vehicle is hard work.

garyd1961 · 10-07-2018, 03:01 PM

edit, better let someone else answer.

**HO455** · 10-07-2018, 06:16 PM

Are you sure about your Posi being a locker? It sounds like you have a clutch style Posi and you are feeling the clutches grabbing and releasing. It happens when turning as the wheels have to turn at different speeds. The heavier the load the more pronounced it will be. A shot of Posi lube may be all you need. Posi lube does lose its effectiveness over time. The Posi in my Burban was so tight at first I had to run two bottles of lube to get it to quit shuddering.
The Detroit Locker I ran in my GTO years ago was noisy and chattered on every corner taken slowly. That doesn't sound like what you're experiencing.

Chilly178 · 10-07-2018, 06:25 PM

It was to my understanding that the eaton no spin was a mechanical locker and didn't use clutches. Only gear oil is required, but I could be wrong.

Mike C · 10-07-2018, 06:47 PM

The occasional "pop" is characteristic of a tru-locking differential. Not much you can do about it but get a different kind of traction device.

I have a PowerTrax No-Slip in the back of my CJ5 and while it is less obtrusive than a LockRight, it still binds up and "pops" sometimes.

With a clutch type LSD, you might get "chatter" but it won't bind up and pop like a true locker does. One of the reasons no OEM sells a mechanical auto locking diff anymore.

Chilly178 · 10-07-2018, 07:07 PM

Quote:

Originally Posted by Mike C

The occasional "pop" is characteristic of a tru-locking differential. Not much you can do about it but get a different kind of traction device.

I have a PowerTrax No-Slip in the back of my CJ5 and while it is less obtrusive than a LockRight, it still binds up and "pops" sometimes.

With a clutch type LSD, you might get "chatter" but it won't bind up and pop like a true locker does. One of the reasons no OEM sells a mechanical auto locking diff anymore.

Ohhh okay thank you for clearing that up! I wasn't sure it was something going out or something. Not worried now if thats just a characteristic of the eaton no slip rear end with that mechanical locker. Thanks for clearing that up.

**jeffahart** · 10-08-2018, 11:08 AM

Yes those Detroit lockers get nerve wracking. You feel like something really must break with how hard they bang sometimes.

Also, just for the sake of it. Check your drive shaft and make sure the slip is not too far compressed. If your shaft is too long and it is almost fully compressed, you can get a clunk when the suspension is articulating. I've seen it on front shafts with heavy breaking, giving a heavy clunk when the shaft bottoms out.
Just a thought. But you get if after turning corners, that spells Detroit Locker.

j

10-07-2018, 10:31 AM	#1
Chilly178 Registered User Join Date: May 2016 Location: Green Bay, WI Posts: 135	Somthing binding every once in a while? Hello, I have a 72 C20 with a 350, SM465, and Eaton no spin rear end 4.10 with the locker. I have changed the fluid in the transmission and the rear end with Mobil 1 gear oil within the last few years. Also the engine is brand new. I haven't touched any of the u joints, carrier bearing, and never removed the diff cover. Once in a while I get some sort of binding or something where its kinda like a pop and the whole truck hesitates for a second then keeps going. Its one of those things where when your friends hear it they think you just blew something or hit a big pot hole then you tell them no it does that once in a while. I'm thinking it happens when I turn a corner for the most part. Seems like it could be possibly getting more frequent. Any ideas? It's gotta be in the drive line somewhere. Also my rear brakes are squealing now at very low speeds like a crawl and they sqeal when I hit the brakes, but not all the time. I just replaced the brake shoes (not the springs) and brake cylinders two years ago and I'm annoyed that I have an issue back there because taking the inner axles out to get the drums off is a pain. I tried backing up in reverse then stomping on the brakes but it didn't seem to help. I'm pretty sure it isn't the E brake because the cable was adjusted last spring and it doesn't seem to be dragging. I know there is an adjustment for the shoes you can get to without taking the drums off not sure if they need adjusting? Any ideas on my issues? I'm thinking that my rear end is gonna get torn apart this winter, which sucks becasue I need to rip into the front end and replace all those suspension components because its all really old. Owning an old vehicle is hard work. Last edited by Chilly178; 10-07-2018 at 10:38 AM.

10-07-2018, 03:01 PM	#2
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: Somthing binding every once in a while? edit, better let someone else answer.

10-07-2018, 06:16 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,469	Re: Somthing binding every once in a while? Are you sure about your Posi being a locker? It sounds like you have a clutch style Posi and you are feeling the clutches grabbing and releasing. It happens when turning as the wheels have to turn at different speeds. The heavier the load the more pronounced it will be. A shot of Posi lube may be all you need. Posi lube does lose its effectiveness over time. The Posi in my Burban was so tight at first I had to run two bottles of lube to get it to quit shuddering. The Detroit Locker I ran in my GTO years ago was noisy and chattered on every corner taken slowly. That doesn't sound like what you're experiencing. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

10-07-2018, 06:25 PM	#4
Chilly178 Registered User Join Date: May 2016 Location: Green Bay, WI Posts: 135	Re: Somthing binding every once in a while? It was to my understanding that the eaton no spin was a mechanical locker and didn't use clutches. Only gear oil is required, but I could be wrong.

10-07-2018, 06:47 PM	#5
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,731	Re: Somthing binding every once in a while? The occasional "pop" is characteristic of a tru-locking differential. Not much you can do about it but get a different kind of traction device. I have a PowerTrax No-Slip in the back of my CJ5 and while it is less obtrusive than a LockRight, it still binds up and "pops" sometimes. With a clutch type LSD, you might get "chatter" but it won't bind up and pop like a true locker does. One of the reasons no OEM sells a mechanical auto locking diff anymore. __________________ 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

10-08-2018, 11:08 AM	#7
jeffahart Senior Member Join Date: May 2012 Location: Scottsdale, AZ Posts: 1,909	Re: Somthing binding every once in a while? Yes those Detroit lockers get nerve wracking. You feel like something really must break with how hard they bang sometimes. Also, just for the sake of it. Check your drive shaft and make sure the slip is not too far compressed. If your shaft is too long and it is almost fully compressed, you can get a clunk when the suspension is articulating. I've seen it on front shafts with heavy breaking, giving a heavy clunk when the shaft bottoms out. Just a thought. But you get if after turning corners, that spells Detroit Locker. j __________________ White K20



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