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which T-5 to use with 3:73 rear?

Discussion in 'The Hokey Ass Message Board' started by DOUBLEZO, Jul 17, 2011.

  1. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    ive been doing alot of reading about swapping a T-5 into my car. i think i have it all figured out except the gear ratio i should be buying. im wondering which T-5 gearing would be best to use in my shoebox with a stock 3:73 rear. the tires are 28 inches tall if it matters. thanks.
     
  2. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    It depends a lot on what motor your running and the weight of the car. There are a wide range of gear ratios out there. Here is a list of most of them.
    http://www.britishv8.org/Articles/Borg-Warner-T5-ID-Tags.htm
    I would suggest one with a .73 OD ratio. that will give you a 2.72 final drive ratio.
     
  3. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    im running a flathead still and i dont know what the car weighs in at. its a 49 ford coupe. i would like to be able to use first gear. ive read about some people needing to start out in second. is there a formula or chart somewhere to help with picking gear ratio combos?
     
  4. mastadon
    Joined: Mar 14, 2010
    Posts: 168

    mastadon
    Member

    You'll be fine with rear gear.I have 3.90 in my 51 truck and it runs at 2400 rpm at 65,but 1st gear is almost useless.What engine are you runnin in the shoebox?
     

  5. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    flathead
     
    Last edited: Jul 17, 2011
  6. AnimalAin
    Joined: Jul 20, 2002
    Posts: 3,417

    AnimalAin
    Member

    Mustang V8 gearsets mostly have 3.35 first gear. That would be a great choice for a flatmotor.
     
  7. 61falcon
    Joined: Jan 1, 2009
    Posts: 772

    61falcon
    Member

    i have a ford world class t5 in my falcon with a 3.90 gear and first gear isnt too steep. a friend of mine has a 53 ford customline with a flathead, chevy s10 t5 and stock gears and it works pretty good. the car could actualy benifit from more rear gear. overdrive is a wonderful thing.
     
  8. badshifter
    Joined: Apr 28, 2006
    Posts: 3,308

    badshifter
    Member

    [SIZE=+1]’85 through ’95: 1st – 3.35 2nd – 1.99 3rd – 1.33 4th –1.00 5th – 0.68[/SIZE]
    [SIZE=+1]
    [/SIZE]

    [SIZE=+1]NWC ’83-84: 1st – 2.95 2nd – 1.94 3rd – 1.34 4th – 1.00 5th – 0.62 [/SIZE]
    [SIZE=+1]
    [/SIZE]
    [SIZE=+1]94-95 3.8 V6:1st – 3.35 2nd – 1.93 3rd – 1.29 4th – 1.00 5th – 0.73 [/SIZE]

    There is no T5 with a 3.90 first to my knoweldge
     
  9. 48 Chubby
    Joined: Apr 29, 2008
    Posts: 1,014

    48 Chubby
    Member Emeritus

    Since you ain't changing any thing except the tranny, just ask your self.

    "How well do I like the first gear I got now? Too high? Too low? Just right?"

    Be aware that trans gear ratios are effectively multiplied by the rear end ratio. Sooo
    a difference of .40 at the tranny becomes a difference almost 1.5 where the rubber meets the road. If you are happy now try to match what you got as closely as possible.
     
  10. RHOPPER
    Joined: Mar 12, 2006
    Posts: 263

    RHOPPER
    Member

    My 2.95 first gear is just a touch high with a 3.55 rear and 28" rear tires. It doesn't like crawling in traffic or stop and go. It does give you a long first so you're not shifting right after you leave a light. With a slightly lower rear you'll probably be ok.
     
  11. v8 garage
    Joined: May 18, 2006
    Posts: 276

    v8 garage
    Member

    He was referring to his rear gear ratio being 3.90
    V/8
     
  12. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,406

    Flat Ernie
    Tech Editor

    Which T5 are you getting? S10, Mustang, Camaro? This will limit your gearset choices unless you build a hybrid T5...but there are several gearsets available.
     
  13. DOUBLEZO
    Joined: Aug 5, 2005
    Posts: 204

    DOUBLEZO
    Member
    from SACramento

    thanks for the input fellas. the stock ford 3 spped gears are as follows. 1st 2.82 2nd 1.60 3rd 1.0 im planning on using the s10 t5. so the s10 t5 that is the closest has a 3.50 first gear. the camaro /firebird v8 is the closest with a 1st gear of 2.95. so if i am understanding correctly, i can use the camero/firebird gears in the s10 case and be good? if thats possible i think thats what ill go with.
     
  14. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    Yes it is possible if both trannies are NWC (non world class) since all the S10 trannys are NWC. If you just want to use the S10 case just because of the forward shifter location then you can put the S10 tailhousing onto any other WC or NWC T5.
     
  15. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,406

    Flat Ernie
    Tech Editor

  16. judd55
    Joined: Sep 13, 2009
    Posts: 101

    judd55
    Member
    from B.C.

    I run a Camaro/Firebird T-5 in my Ponch with a 3:70 rear, perfect combo in my books...........all gears totally useable from the 2:95 1st to the .063 O.D. Love it.....best mod to date. An S-10 tail shaft allows it to be used with the bench seat. :D You might find the S-10 boxes a tad steep in 1st gear for a 3:7 gear set.

    [​IMG]
     

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