2 man M998 rear wheels problem

H1 (Hummer) & HMMWV Specific Information

2 man M998 rear wheels problem

Postby merrit007 » Fri Jun 10, 2016 10:32 am

HI, I am new to this forum and hope i am posting in the right place. I have an 1987 M998 that was one of the trucks released by the USMC back in the late 80's . I have noticed the rear wheels are bowed out towards the outside of the truck. I don't know if this an issue of not enough weight in the rear or if there is a way to adjust the tow. Also when driving in soft dirt or mud and you begin to turn the truck there is a clunking sound that seems to come from the rear wheel on the drivers side. Could it be the geared hub or a locker issue? One other thing i noticed is that when you hit 30 mph the truck shakes but above or below that speed it is fine. Any insight would be great. Thanks
merrit007
New User
New User
 
Posts: 2
Joined: Fri Jun 10, 2016 10:22 am
Vehicle: 1987 M998

Re: 2 man M998 rear wheels problem

Postby Docj » Thu Jun 16, 2016 1:19 pm

Bowing could be ball joint or control arm bushings or just need aligning.
Clunking well 1/2 shaft, bearing in hub, ball joints control arm bushings.
Shaking wheel bent, balance, ball joints, control arm bushing. Better get it looked at. Try jacking the truck up on that side and bull tire in and out top to bottom. Sometimes you can but pry bar under tire and pull it look for movement that should not be there.. You can put transfer case in neutral and spin tire to see if noise can be reproduced on jack. 1/2 shaft should not have any play in it either...
1993 Hummer H1 HMC4
2007 Hummer H2 37 Nitto's Mud Grapplers
2005 Hummer H2. 37 Toyo MT Magnacharger Supercharger
2003 Hummer H2 5.5 Skyjacker Lift, 38 Nitto Mud Grapplers
User avatar
Docj
Club Member
Club Member
 
Posts: 43
Joined: Thu Jan 28, 2016 10:52 pm
Vehicle: Hummer H1

Re: 2 man M998 rear wheels problem

Postby merrit007 » Thu Jun 16, 2016 2:52 pm

we had all 1/2 shafts replaced and all ball joints along with all linkages.
merrit007
New User
New User
 
Posts: 2
Joined: Fri Jun 10, 2016 10:22 am
Vehicle: 1987 M998

Re: 2 man M998 rear wheels problem

Postby Docj » Sat Jun 18, 2016 9:29 pm

Alignment control arm bushings, the toe is adjustable, or bad output shaft bearings
1993 Hummer H1 HMC4
2007 Hummer H2 37 Nitto's Mud Grapplers
2005 Hummer H2. 37 Toyo MT Magnacharger Supercharger
2003 Hummer H2 5.5 Skyjacker Lift, 38 Nitto Mud Grapplers
User avatar
Docj
Club Member
Club Member
 
Posts: 43
Joined: Thu Jan 28, 2016 10:52 pm
Vehicle: Hummer H1


Return to H1 Tech

Who is online

Users browsing this forum: No registered users and 3 guests