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Old 10-02-2013, 08:50 PM   #9
motornut
78K & 79C Jimmys
 
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Join Date: Nov 2009
Location: Ottawa Ont CANADA
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Re: TH350 problems Shifts at 4500+rpms?

Quote:
Originally Posted by INSIDIOUS '86 View Post
Is your vacuum line to the modulator hooked up? Check the lines
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yup i'd check that first,top and bottom make sure the hose bit is tight and not oily or cracking
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1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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