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View Full Version : Rear End Ratio Suggestions....



n/a
02-28-2006, 09:57 PM
It runs and drives, but beyond 50 MPH the engine rev's get too "wound up". It has a OHV 6, FOM tranny and 3.73 model 27 rear end now. I want to be able to cruise easier with this, what rear end ratio should I put in it? I have a 3.31 TT 27 I'm thinking of swapping, is this a good choice? Will this give me acceptible engine rev's at hyway speeds? Never had a OHV with auto so I don't have much experience with what works.
Thanks
Kent

JDP
02-28-2006, 10:09 PM
It'll be damn slow getting up to speed, not much power to spare for that high a rear gear.

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64 R2 4 speed Challenger
63 R2 4 speed GT Hawk
63 Daytona Convert.

Dick Steinkamp
02-28-2006, 10:21 PM
quote:Originally posted by Kent

I just accuired a 62 daytona hardtop two door in a trade. It runs and drives, but beyond 50 MPH the engine rev's get too "wound up". It has a OHV 6, FOM tranny and 3.73 model 27 rear end now. I want to be able to cruise easier with this, what rear end ratio should I put in it? I have a 3.31 TT 27 I'm thinking of swapping, is this a good choice? Will this give me acceptible engine rev's at hyway speeds? Never had a OHV with auto so I don't have much experience with what works.
Thanks
Kent

There are a bunch of RPM calculators out there. Here's one you can use...

http://www.richmondgear.com/101032.html

You can certainly get your highway revs down with the higher ratio rear end, but as John says, you may then be disapointed in your acceleration. The manual three speed OD trans with some DEEP gears (4.11's or so) was a great combo for the little 6's.

-Dick-

-Dick-

N8N
03-02-2006, 03:41 AM
I vote keep the 3.73s and swap to an OD tranny...

nate

--
55 Commander Starlight
62 Daytona hardtop
http://home.comcast.net/~njnagel

Mike Van Veghten
03-02-2006, 12:21 PM
Actually....my flathead 6 Conestoga came with 4.86 gears and an overdrive 3 spd (manual 3 spd.). It worked great on the street and freeway....at least for the overall power of the engine!

I'd say you need at LEAST 4.11's and the O.D. trans.

buddymander
03-05-2006, 08:22 PM
Kent, I'd go ahead with the 3:31's in place of the 3:73's because the difference will only be about a half of a gear change; tranny-wise. You will notice a difference but it won't be huge. But if you put in an overdrive while keeping the 3:73's, you might experience lugging of the engine at highway speeds because that overdrive is like a whole gear change. Don't forget; you can always change tire sizes for minor differences in final drive ratio feel.

Swifster
03-05-2006, 08:29 PM
I'd keep the auto and drop down to either the 3.31 or a 3.54 . Trying to piece together a manual set up on a car with an auto is a pain in the...backside.

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Tom - Lakeland, FL

1964 Studebaker Daytona

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