AndyBill402 Posted December 19, 2015 Share Posted December 19, 2015 I would like to add a transmission cooler to my 71 stock Monte Carlo 350. Is the correct size hose 5/16" or 3/8"? Quote Link to comment Share on other sites More sharing options...
South Carolina 72 Posted December 19, 2015 Share Posted December 19, 2015 My 72 has 3/8 lines on it. I'm sure yours is the same size. Quote Link to comment Share on other sites More sharing options...
footballubet Posted December 19, 2015 Share Posted December 19, 2015 Make sure the cooler has 3/8" lines also. I've seen some that are 5/16". Quote Link to comment Share on other sites More sharing options...
420ponies Posted December 19, 2015 Share Posted December 19, 2015 Like most ,don't use just your add on cooler. Still use the cooler that is in the radiator too . radiator transmission cooler then out to the add-on cooler, then back to the transmission. Your transmission will thankyou for it. Quote Link to comment Share on other sites More sharing options...
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