any 4x4 GMC gurus here???

poppa · 08-30-2009, 07:37 PM

Got a 86 full sized(has seen better days) Jimmy.When I go down the road it makes a funny noise,like a whinning then when I let off the gas it goes away. I tell you this in case it's related to this problem(the big one).I went on the freeway once and just about got to 50 and something was banging like all get out I mean it was shaking and jerking something bad. About a month later(around town seems ok) I had no choice,my truck(other one) was down and so was wife's car.Took her to work(went on freeway and held my breath) and it was ok.Dropped her off,left ,stopped at a light and when the light changed took off ,got about 50 feet and that same violent banging was back. If I had to guess it is almost like the teeth in the rear(or front) end weren't lining up quite right. That or the chain in the transfer case is stetched bad and not always ridin in the chain right. Looked at it today a little and no way I'm trying to take off the cover for the front pumpkin(bolts look like they will round off if I even get a wrench close to them). Jacked it up and put it in 4x4 ,spun the driveshaft and the drivers side front and the pass side rear seem to be turning togather,other two seem to be on vacation,not turning the same speed(slower).I should probably mention it's lifted with 31" tires. I apologise for the long winded post,trying to think of everything(and I know,I forgot something). So my ?? is.....axels or transfer case,where would you start. Truck runs and drives alright otherwise ,doesn't get much use kind of our back up vehicle.Right now,time is my enemy...not enough of it. Thanks for your patience if you got this far.

Flintrock · 08-30-2009, 08:11 PM

Think I would take a good look at the U-Joints first... That would be a simple and relatively inexpensive fix, and you certainly don't want to pole vault that thing.

poppa · 08-30-2009, 08:37 PM

First thing I looked at. See.....I knew I'd forget something.LOL

buscopat · 09-01-2009, 06:22 AM

Your violant banging and jump almost sounds like a set of bad auto hubs on the front of your truck.

poppa · 09-01-2009, 07:44 AM

Can I take something off and run it to see????

jdinville3 · 09-01-2009, 09:19 AM

Quote:

Originally Posted by Flintrock

Think I would take a good look at the U-Joints first... That would be a simple and relatively inexpensive fix, and you certainly don't want to pole vault that thing.

This was my first thought also.... You can take the front drive shaft out and drive it that way and vise versa with the rear drive shaft.

poppa · 09-01-2009, 10:55 AM

Rear joints looked ok(replaced last year),fronts were replaced in May,also looked ok,ends of front axels(joints)looked ok.Thanks

mphillip · 09-03-2009, 05:34 AM

You may not want to here this but it could be your torque convertor. I had a S-10 back in the day and it was doing something similar and something on the inside of the convertor went bad and it was causing the truck to shake and make a popping noise. I would check out all other options before you go to that extent though.

carguy · 09-09-2009, 08:53 AM

How about checking the harmonic balancer at the front of the engine? I put a 302 in a Ranger PU (that was a FUN ride!) and it did the same thing as you are describing.

Or, check all the pulleys and belts & make sure they are all tight.

Have fun, Dave

ccrcl87 · 11-06-2009, 12:02 AM

I had a 86 blazer full size and it was doing similar things. The transfer case drive chain was breaking apart and binding in the gears. May not be your problem but worth a look. When I took the drain plug off the transfer case small pieces of the chain fell out. Mine made a crunching noise and sounded like I had a card in the spokes of my bike while slowing down. Pull drain plug and check. Good luck.

08-30-2009, 07:37 PM	#1
poppa Getting Wild Join Date: Mar 2008 Location: Angel Nebula Posts: 144	any 4x4 GMC gurus here??? Got a 86 full sized(has seen better days) Jimmy.When I go down the road it makes a funny noise,like a whinning then when I let off the gas it goes away. I tell you this in case it's related to this problem(the big one).I went on the freeway once and just about got to 50 and something was banging like all get out I mean it was shaking and jerking something bad. About a month later(around town seems ok) I had no choice,my truck(other one) was down and so was wife's car.Took her to work(went on freeway and held my breath) and it was ok.Dropped her off,left ,stopped at a light and when the light changed took off ,got about 50 feet and that same violent banging was back. If I had to guess it is almost like the teeth in the rear(or front) end weren't lining up quite right. That or the chain in the transfer case is stetched bad and not always ridin in the chain right. Looked at it today a little and no way I'm trying to take off the cover for the front pumpkin(bolts look like they will round off if I even get a wrench close to them). Jacked it up and put it in 4x4 ,spun the driveshaft and the drivers side front and the pass side rear seem to be turning togather,other two seem to be on vacation,not turning the same speed(slower).I should probably mention it's lifted with 31" tires. I apologise for the long winded post,trying to think of everything(and I know,I forgot something). So my ?? is.....axels or transfer case,where would you start. Truck runs and drives alright otherwise ,doesn't get much use kind of our back up vehicle.Right now,time is my enemy...not enough of it. Thanks for your patience if you got this far.

08-30-2009, 08:11 PM	#2
Flintrock Raised by coyotes Join Date: Nov 2008 Location: Central Texas Posts: 5,658	Re: any 4x4 GMC gurus here??? Think I would take a good look at the U-Joints first... That would be a simple and relatively inexpensive fix, and you certainly don't want to pole vault that thing.

08-30-2009, 08:37 PM	#3
poppa Getting Wild Join Date: Mar 2008 Location: Angel Nebula Posts: 144	Re: any 4x4 GMC gurus here??? First thing I looked at. See.....I knew I'd forget something.LOL

09-01-2009, 06:22 AM	#4
buscopat Gone Crazy Join Date: Dec 2008 Location: Churubusco, IN Posts: 2,161	Re: any 4x4 GMC gurus here??? Your violant banging and jump almost sounds like a set of bad auto hubs on the front of your truck.

09-01-2009, 07:44 AM	#5
poppa Getting Wild Join Date: Mar 2008 Location: Angel Nebula Posts: 144	Re: any 4x4 GMC gurus here??? Can I take something off and run it to see????

Today
BGW	Sponsored Links __________________ This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum

09-01-2009, 10:55 AM	#7
poppa Getting Wild Join Date: Mar 2008 Location: Angel Nebula Posts: 144	Re: any 4x4 GMC gurus here??? Rear joints looked ok(replaced last year),fronts were replaced in May,also looked ok,ends of front axels(joints)looked ok.Thanks

09-03-2009, 05:34 AM	#8
mphillip Site Moderator Join Date: Dec 2006 Location: Tennessee Posts: 2,008	Re: any 4x4 GMC gurus here??? You may not want to here this but it could be your torque convertor. I had a S-10 back in the day and it was doing something similar and something on the inside of the convertor went bad and it was causing the truck to shake and make a popping noise. I would check out all other options before you go to that extent though.

09-09-2009, 08:53 AM	#9
carguy Gone Wild Join Date: Jul 2009 Location: Loveland, CO / Sun Lakes, AZ Posts: 263	Re: any 4x4 GMC gurus here??? How about checking the harmonic balancer at the front of the engine? I put a 302 in a Ranger PU (that was a FUN ride!) and it did the same thing as you are describing. Or, check all the pulleys and belts & make sure they are all tight. Have fun, Dave

11-06-2009, 12:02 AM	#10
ccrcl87 Not Yet Wild Join Date: Jul 2009 Location: South central PA Posts: 18	Re: any 4x4 GMC gurus here??? I had a 86 blazer full size and it was doing similar things. The transfer case drive chain was breaking apart and binding in the gears. May not be your problem but worth a look. When I took the drain plug off the transfer case small pieces of the chain fell out. Mine made a crunching noise and sounded like I had a card in the spokes of my bike while slowing down. Pull drain plug and check. Good luck.