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Old 03-07-2018, 07:13 AM   #2
DransportGarage
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Join Date: Feb 2010
Location: Lebanon, Ohio
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Re: Rear end ratio for 700R4?

Quote:
Originally Posted by MiraclePieCo View Post
Just decoded the GM 12-bolt rear that came with my '51 panel truck - it claims to be a 2.73 ratio. Is this too high to be suitable for a 700R4 overdrive trans? Stock SBC motor and trans, 28" tires. Most of my driving is freeway and I virtually always accelerate like your granny.

PS: Online speed/rpm calculators show that at 65 mph I'll be turning about 1500 rpm.
Just my opinion, but I say too high (unless you're setting up for the standing mile, in which case your theoretical speed at 6000 RPM will be 260 MPH).

**My granny thankfully drove Ramblers for the most part, but she thought the accelerator pedal -- and the brake pedal -- were on/off switches. (The phrase "stab it and steer" comes to mind.) True story: In a moment of brilliance, her son (my uncle) bought her an uber high mileage puke-green 4-bbl 350 '69 Nova when she was about 85 because it was cheap. Within a week she took out the windshield, the A, B and C pillars on the passenger side and the back window when she clipped the tailgate of a large truck. It was spectacular, and no one was hurt. I still remember her exclaiming "Ach du Lieber!" (OMG) as she described the event. Bless her heart and rest her soul.
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Bob
"It won't take long and it won't cost much."
'55 3100 (383/700R4)--'55 Belair Sedan (350/4-speed)--'64 'Vette Conv. (327/4-speed)--'68 GTO Conv. (462/4-speed)--'69 Cutlass Conv. (350/TH350)--'06 'Vette Conv. (LS2/6-speed)
Bob's Retirement Build - My 55 TF
Bob's 700R4 Build (how-to)

Last edited by DransportGarage; 03-07-2018 at 07:32 AM.
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