Reg Evans Posted September 2, 2015 Report Posted September 2, 2015 Just took delivery of a '39 Chrysler Royal Sedan. Love the front styling. I purchased this car through eBay and the owner description was very accurate except he left off the fact that it is equipped with overdrive. I am wondering if the overdirve unit for '39 is different than the later R10 unit. I haven't had a chance to put it on the lift for a visual yet. The owners manual shows that the knob should be pulled all the way out to disengage the OD but this knob does not seem to pull out very much. Maybe 1/2" I don't see any wires going to the carb either. Another question. The car is equipped with a 241.5 engine. I'm wondering if the only difference between a 241 and a 251 is the bore or is it a combo of bore and stroke ? Thanks in advance Guru's 3 Quote
pflaming Posted September 2, 2015 Report Posted September 2, 2015 WOW, WOW, WOW. You got to bring this to the April BBQ. 1 Quote
Don Coatney Posted September 2, 2015 Report Posted September 2, 2015 Good score. You can even drive it on half foggy days. I like the wire wheels. I believe the only difference in the engine is the bore but I could be wrong. dodgeb4u will know for sure. 1 Quote
Oldguy48 Posted September 2, 2015 Report Posted September 2, 2015 Beautiful car....but I don't know the answer to your question! 1 Quote
desoto1939 Posted September 2, 2015 Report Posted September 2, 2015 I have sister car to your 39 Chrysler. I have the 39 Desoto Model S6. But no one can tellthe difference between the Custom and the Deluxe Model. The over drive would use the rod to pull it own and there should be several relays for the unit to work properly. Do you have the service manual on the unit it would be the same as in the 39 Desoto and I could send that to you. Rich HArtung Desoto1939@aol.com Quote
Reg Evans Posted September 2, 2015 Author Report Posted September 2, 2015 Thanks Rich ! I don't have the service manual. Can you send via email or via snail mail ? Quote
Niel Hoback Posted September 2, 2015 Report Posted September 2, 2015 That's just beautiful !! You're an eBay winner. 1 Quote
greg g Posted September 2, 2015 Report Posted September 2, 2015 It is likely the R7. Get a hold of Chris Bamford,(Bamfordsgarage) I think he has one for his world famous North American Touring Dodge. 1 Quote
B-Watson Posted September 2, 2015 Report Posted September 2, 2015 The 241.5 cid engine has a bore and stroke of 3.375" and 4.50". The 250.6 cid engine has the same stroke but the bore is larger - 3.438". 2 Quote
Reg Evans Posted September 2, 2015 Author Report Posted September 2, 2015 So, would that be .060 over pistons ? Quote
blueskies Posted September 3, 2015 Report Posted September 3, 2015 Beautiful car Reg... The overdrive is probably the R-7 unit, which is quite a bit different from the R-10. It doesn't have the electronics that the R-10 has. I bought one for my '50, not knowing the difference at the time. Neil Riddle was a great source of info. I wound up selling it to someone who was looking for the R-7 and bought the R-10. Pete 1 Quote
Reg Evans Posted September 3, 2015 Author Report Posted September 3, 2015 Thanks Pete ! I think you're right. How's the Willys doing ? Quote
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