T8500 Allison 6 spd bucking

dimanche 24 juillet 2016

1 have a 1999 GMC(Isuzu F series) T8500 with only 10,000 miles on it.
Just converted to a flat bed and when loaded it bucks at about 30 mph in 4 and 5
It has a Cat 3126 with an Allison 6 speed (6 is locked out)
Any ideas?
Cheers Len


T8500 Allison 6 spd bucking

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