what is that 'CLUNK!!!'?

[guy]

I've got a '79 J-20 that has a noise ('clunk') somewhere in the drivetrain. This occurs on acceleration after coasting.
Any ideas?

Thanks.

Guy

[Gladi8r]

Don't know about the "clunk" but what part of East Texas you from?? Used to live in Kilgore and Overton and wifey is from Henderson.

------------------
DON

1988 GW mostly stock, <---Wifey's truck (won't let me "fix it up")

1971 J-4000,Rhino Grille(to be installed)
360 CID 8.5/1 ratio 2v, 245 HP, 365 ft/lb
T-18A, Dana 20, PTO, DANA 44 (Front/Rear)
Soon to be torn down for Resto
71 Gladiator Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld2&.src=bc)

78 GW (parts truck)
360 4v Th400
Dana 44 F/R
http://www.j-trucks.freeservers.com/
78 Wagoneer Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld3&.src=bc)

[RudyC]

what transfer case do you have? Q trac?
Could be your chain.
You didnt put your specs like engine, tranny, t case.

------------------
"THE GREAT SANTINI"
1979 WAGONEER, 360,
Holley carb.
Stock 4bbl Intake,
TFI CONVERSION, TH400, Q-TRAC. 3" ADD A LEAFS, 31" MUD T/A'S (PEP BOYS CLONES).

http://home.earthlink.net/~zzjoecool/index.html

[wn]

<BLOCKQUOTE>quote:</font><HR>Originally posted by guy:
I've got a '79 J-20 that has a noise ('clunk') somewhere in the drivetrain. This occurs on acceleration after coasting.
Any ideas?

Thanks.

Guy<HR></BLOCKQUOTE>

I have a 79 J-10 and I know what you are talking about. I think I need new universal joints. I have 159,000 but I have driven it less than a year. I also get clinks when I put it in reverse. Do you get vibration from the drive train as well? Mine does at about 60 mph. I usually drive about 50.

Dub

[David Simon]

You might want to check the transmission mount and crossmember bolts. Mine had a clunk when I put it in gear and when accelerated. There are 8-10 bolts and all mine were loose.
David

------------------
98 Cherokee (wife's)
97 TJ with all the goodies
http://www.jeepersjeepclub.4wdriver.com/OcalaCampout/Ocala4.7.00/Dave.JPG
88 GW still stock but I'm working on it

[tucsonrick]

Yeah, a u-joint would do it, so would play in the ring & pinon gears .
tucsonrick
'69wag(mostly stock)

[Millerluck]

If the U-joints are ok I would check the trany mount like David said. Mine was toast and would clunk after coasting. Did it real bad if you coasted then stabbed the gas hard.
The bolts were loose too.

Try pushing up on your transfer case. If you can push it up 1/4 inch by hand its bad. You gota push pretty hard. Thats the way mine was.

Also when I changed mine I had to loosen every thing up to get the bolts to start in the new one. Also I used a botel jack to raise things up for the swap. I never took the cross member all the way off. But a GW might not be the same.

Later

Larry Miller



------------------
88GW "Mississippi"
Black,360,727,NP229
D44 F/R,3.31gears,
Tracklok F/R,
Superwinch hubs,
4" Skyjacker no blocks,
31x10.5x15BFG AT's.
TEAMRUSH UPGRADE,
MSD SUPER CONDUCTOR wires,BLASTER TFI COIL
Thorley headers,3" exaust,Flomaster
My JEEP http://albums.photopoint.com/j/AlbumIndex?u=1377593&a=10390487

[BIGYELLOW78J10]

Definitely check the U Joints. Also check the CV or double cardan joint. this is the funny looking double U-joint right next to the Xcase.

Daniel

------------------
78 J-10 Rumblin Wreck (http://www.prism.gatech.edu/~gte644i/TRUCK.jpg)
2v 360 V-8
Stock down to the rust
Highway speed in about an Hour

[guy]

Oh yea!! I forgot.

The specs are:

Turbo 400 tranny

Quadratrac t-case, chain has less than 10,000 miles on it.

Thanks for the replies.

Guy

[joe]

Guy, all the above posts a good advice but be sure to take a "real good" look at the CV joint on the front drive shaft. They are notoriously neglected items when it comes to being greased and if it lets go at hwy speed it WILL remove major chunks of aluminum from the front of the transmission case http://www.ifsja.org/ubb/frown.gif

------------------
Regards,
-joe
63 2-dr Wag, 73 J-4000, 82 CJ-8