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Technical Factory applications with a Ford 8 inch with 3.73 or 4.10 gears

Discussion in 'The Hokey Ass Message Board' started by junkyardjeff, May 18, 2019.

  1. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 6,980


    It looks like the 3.55 gears are not making my 235 with a T-5 happy in 5th so I will be on the hunt for those gears and was wondering if there was any factory applications to look for,I see them all the time at swapmeets but a little too pricey for my cheap ass budget.
  2. I only know of 2.79 or 3.00 gears from factory. I have 3.55 gears behind a decent y-block build and I have to be pulling 45 to 50 mph to hit fifth or it goes flat. Granted I listened to the vendor who sold me too much cam. That's on me. I got the 3.55 gears from Summit I think.
    stillrunners likes this.
  3. okiedokie
    Joined: Jul 5, 2005
    Posts: 3,450

    from Ok

    I have 3.27 8” from a Torino in my 40, that is the lowest I have found in factory rears. The housing is Maverick.
  4. The early 60,s fairlanes with six cyl stick have 355 gears
    Hamtown Al likes this.
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  5. X-cpe
    Joined: Mar 9, 2018
    Posts: 483


    I got a couple of sets of 8 inch 3.55 gears from Pinto/Bobcat V-6 manual trans station wagons. I also have an aftermarket 4.62 gearset.
    Hamtown Al and stillrunners like this.
  6. F&J
    Joined: Apr 5, 2007
    Posts: 13,132


    3 years ago I bought new 3.80 gear set from Ebay for $135 or 140 shipped. When the set came, the box was from Richmond Gear.
    Hamtown Al likes this.
  7. Oldioron
    Joined: Dec 12, 2018
    Posts: 511


    I've got a drop out with 3.80s and a Detroit locker.
    Joined: Sep 8, 2015
    Posts: 570

    from West, TX

    Just looked the other day at Summit. 3.80’s were $160. I thought that was a good price.
  9. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 6,980


    I was hoping for a factory application but will have to settle for a aftermarket gear set or go with a 9 inch.
  10. fastcar1953
    Joined: Oct 23, 2009
    Posts: 1,489


    newer explorers have 4.10 in the 8.8 rearend
    junkers72 likes this.
  11. kruzin karl
    Joined: Mar 17, 2008
    Posts: 88

    kruzin karl

    All late 90's Explorers with the 5.0 V8 had 8.8 posi disc brake rears3.73 and 4.10 ratios were very common in these rears.
  12. deathrowdave
    Joined: May 27, 2014
    Posts: 1,438

    from NKy

    Limited ratios in 8in vs. available ratios for 9in . I was thing 3.55 was steepest OEM . But lookin like I was wrong again .
  13. You won't find anything in the boneyards unless your very lucky... Ford did offer some low ratio 8" rears but they were optional and very few got ordered. Look under early Fairlanes (62-65), V8 Falcons and first-gen V8 Mustangs.
    Old wolf and Hamtown Al like this.
  14. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 1,196

    from illinois

    A 3.7-8 gear is only going to change your cruise rpm by a couple hundred +- , before
    I spent a bunch of money
    I'd look for some taller tires to see if that ratio is going to help...........
  15. Um.. 2old— I think you mean shorter tires. Taller tires will be akin to lower numerical gears

    Sent from my iPhone using The H.A.M.B. mobile app
  16. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 6,980


    If it was a new build I would go with the 8.8 but I am just going to put some steeper gears in it and call it done,the older I get the less work I want to do.
  17. ebfabman
    Joined: Mar 10, 2009
    Posts: 583


    You're gonna need something in the 4 series. T5 fifth gear .63x4.10=2.6 You're at 2.2 now. Going with a 4.10-4.11 will add around 500 rpm and likely get you more into the power range of that 6.
  18. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 6,980


    At 70 in 5th the power was lacking,there might be another problem with stepping up the gears and it is since my trans has the 4.03 first gear it will be like a granny gear in 1st but might be able to start off in 2nd.
    Joined: Jul 20, 2006
    Posts: 1,520


    I had an 8" in my 39 deluxe had 3.55 gears from a pinto wagon V-6 std trans
  20. X-cpe
    Joined: Mar 9, 2018
    Posts: 483


    84-85 Lincoln Continental Mark VII with the 2.4 liter BMW diesel had an 8" with a 4:11 gearset. At least the one that was donated to my program in the late 90's did.

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