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Allison Problem ? Solenoid ?

3K views 3 replies 3 participants last post by  Hoggy1 
#1 ·
Hi All, Recently I Had an Issue With the NSBU Switch, I replaced It with Original Allison Replacement Part, Selector Lights Working Fine a Week Later Driving Up Steep Grade Holding in 5th Gear, The transmission made a Thud noise, Engine Light came On Trans Mission Seemed to Stay in 4th Gear Would Not Up shift Or Down Shift After 30 Minutes Sitting with Engine OFF The Transmission Worked Fine Engine Light Stayed On... Could It Be A Solenoid Causing The Problem Case PSI To High ??? :help Any Ides, Trans Does Not Slip.... Im Stumped
 
#3 ·
sounds like a limp.... but you need to pull the codes? where you running a tuner? what size tires?? you need to fill out your sig for more help
 
#4 ·
P0735 code, 285/75/16 Stock Tune I Think, I Bought it Used Off GMC Dealer, They replaced All Injectors Due to Hard Start Issue 3 Months Ago (warrantee)
 
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