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Jul 5, 2017 8:08 AM - 661 Views Create A New Thread

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30 A pickup

Cowpens, SC

273 rear gear with OD?
I have started working again on a 48 Ford convertible that i have had for over 20 years. Back then, I set it up for a TH350 transmission. I have been thinking about something with OD now. But the rear gear is a 273. My thoughts now are 273 & OD would not be good together. What are you guys thoughts?



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  • BigAlBre
    Oct 10, 2017 at 5:00 PM

  • I had a 200R and 3:73 posi in the 36 and it worked great.....jumped sideways off the line and cruised great on the highway...my 350 mount flipped around almost lined up perfectly...hogged out the holes a little and walla!! Anybody know where the 36 is?

  • dixie
    Jul 27, 2017 at 8:16 AM

  • For one u do npt hav to run OD all the time ,only when u choose to, that gear will not hurt anything .

  • 32 Dodge
    Jul 7, 2017 at 5:45 AM

  • Looks like the days of;
    390,411,430,456,and 488 are gone!
    Oh well.................so are the days of .32 cents a gallon!

  • DavyJ
    Jul 6, 2017 at 7:43 PM

  • I just swapped my 350 turbo for a 200R it fit pretty close, had to move the crossmember back about 6" and had to get a 90 degree adapter for the speedo sender because it did not clear my exhaust. It makes a big difference in rpm at cruising speed and has a better low gear. I have 3.73 rear with 25" tall tires...... I also had to make my own shifter brackets so the shifter would come through the existing hole in the floor...I used the same 350 shifter and the same flywheel, the driveshaft did not need altered either
    So to me that indicates that your rear gear is too small for an overdrive trans, you would probably be idling along on the highway :)
    So To me that indicates that your rear gear would need to be changed to work with overdrive tranny or else you would be at an idle on the highway and have no power curve.

  • 32 Dodge
    Jul 6, 2017 at 6:43 PM

  • Hey Jim,
    How far will your insurance company let you drive each year?

  • GeneF
    Jul 6, 2017 at 5:28 PM

  • Jim, thats the way to go, buy a donor car. That way you can get all the little items, and the computer. Everything matches that way, even if you send the computer out to have it reflashed.

  • jimmothershead
    Jul 6, 2017 at 9:14 AM

  • In 1985, we started building our '33 Ford sedan delivery for cruizin' to many rod runs around the USA. Downs body, heavier then steel, TCI chassis.
    8" Maverick 2.73 rear. 2.35X70 rear tires. Bought a wrecked '85 Iroc/305 ci. = 700R-4, with only 1069 miles.
    Today, old faithful has cruized to Oklahoma City NSRA Nats, to Ocean City Show, to Syracuse NY Nats, to Key West Florida, NSRA Columbus and Louisville, to Shades in Tenn, to Knoxville, to Nats East York Pa, to Richmond Va, Good Guys Columbus, Myrtle Beach SC, Turkey Rod Run Daytona Beach, NSRA Tampa Florida, Good Guys Pa, Good Guys Charlotte NC, and all points in between (ZZ Top). Many cruize Nites and local car shows,
    Over the Blue Ridge mountains many times........over 75,000 miles with no problems.
    Leaving a green light, half throttle, 2nd gear will still chirp !
    Jim, bangin' on old cars since 1957
    410 535 1933, 410 535 1932

  • 30 A pickup
    Jul 6, 2017 at 6:10 AM

  • Thanks for the info. Probably going to just keep the 350 with a taller tire & drive it. Had it so long that it is part of the family now.

    Jeff, how have you been doing?

  • Jaybird
    Jul 5, 2017 at 8:43 PM

  • My Roadster has a 2:79 8 inch Ford with a 2004R trans. I run it around town in 3rd. On the highway, in 4th with the converter locked up, I'm running at 1500rpm at 70 mph. It really cruizes. 20mpg. The 350 would be fine but you'll run at a higher rpm (not a big deal). The big difference for me was the noise factor. Car runs so much nicer and quieter on a road trip. It just depends on how or where you are going to drive it. If you aren't planning trips....stick with the 350.

  • tazhog54
    Jul 5, 2017 at 12:55 PM

  • The 350 would work fine with those gears ! Save your money keep the 350 !

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