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That would be the infamous Turboglide... the GR stands for grade . most were taken out by dealerships and replaced with the more reliable PowerGlide
 

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It has P R N D GR
1957 was the first year for the "Troubleglide" transmission and it was available up to and including the 1961 models... By then they got the bugs worked out of it but the public lost faith in it... Later, Dave
 

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grade retard, some years it was hr hill retard.
Some said it meant hot rod and that was the demise of those trannys.
I've got one if you need one.
 
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