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#1
08-30-2012, 05:07 PM
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Transmission question
What would cause the transmission on a 1970 GP to shift hard when cold, but shifts smoothly after its warmed up? Has anyone else ran into this!
Thanks. Wes |
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#2
08-30-2012, 05:35 PM
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How is your vacuum supply and have you checked it at the modulator?
__________________
The difference between inlaws and outlaws? Outlaws are wanted |
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#3
08-30-2012, 05:43 PM
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I put a new hose on the modulator, have not put a gage on the vacuum system, i will check that.
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#4
08-31-2012, 11:59 AM
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Like engine oil and higher oil pressure when cold, the fluid is thicker causing higher pressures, pretty much normal from my experience.
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#5
08-31-2012, 04:10 PM
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Trans
Found the trans oil level way over the recommended level, there is a lot of little things popin up on a car that has sat awhile. Making a punch list..LOL it's going to be a busy winter.
Wes |
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#6
08-31-2012, 04:47 PM
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Vacuum Modulator valve may LIKELY be binding in the case.
take valve out and 320 grit the valve, with bind area TYPICALLY being the largest Diameter landing. |
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#7
08-31-2012, 08:01 PM
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Trans
1/2 inch,
That's a good point especially since its been sitting for awhile, can't hurt to pull it off and check it. Thanks Wes |
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#8
09-10-2012, 10:26 AM
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Transmission Modulator Valve Help Needed
Can anyone tell me the GM part Number for the M40/ TH400 transmission modulator valve?
Would any TH400 modulator valve work, ie 1973 in 1970 car? Does anyone have a modulator valve available or a source? I have found one for a later model M40. Any thoughts guys? Wes |
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#9
09-10-2012, 10:28 AM
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The aftermarket red stripe, small can modulator will work fine. That is what we use on any THM 350/400 and it is adjustable.
__________________
The difference between inlaws and outlaws? Outlaws are wanted |
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#10
09-10-2012, 10:38 AM
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Trans,
Steve,
Thanks for the info..that will certainly make thing easier, I will look for that option. Wes |
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