Re: 98 GMC SAS HPD60 steering issue
Well, heck…I got my bearings totally backwards somehow. Positive caster would be tilting the pinion down (upper balljoint/kingpin tilted towards the back which would mean the pinion would have to come down). Too many years away from alignments I guess. Sorry…
Hopefully correcting the toe corrects the issue. For some reason the axle position (diff-cover view) still seems off kilter to me but I could be wrong.
I just looked up the toe settings for a 1999 3500-HD with an I-beam front axle and it is 0.028 degrees-0.028 degrees while a late model GM 4500 4x4 with a SFA calls for the toe to be 0.02-0.08° and a caster setting of 3-5°.
It looks like you have a Ford Dana 60 so it would be worth checking the specs for a F-truck, which you probably already have done.
Sorry to confuse you with my previous backasswards post.
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Current vehicle collection:
1978 Chevrolet K10, 8.1L, NV4500, NP205
1989 Chevrolet Suburban, 8.1L, NV4500, NP241
1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E
2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed
2014 Chevrolet Impala LTZ 3.6L
Vortec 8.1L because life is too short to tolerate underpowered vehicles
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