When you say voltage is ok...
From your post, I am not sure when you measured voltage and SG.
You may have already checked this, but if it were me I would run the pack down to about %50 (36.3v) and then check the voltages. I would look for a weak battery in the pack.
If they are all down about 50%, then the plot thickens...
No matter what you find it is always a good idea to check tire pressure and brake drag as others have stated.
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Photobucket has changed their site from free for years to now blocking your photos, shame on them and will have to find new way to post albums I have.
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