Rear end gears

Discussion in 'Got gears?' started by Al68buickgs, May 11, 2017.

  1. Al68buickgs

    Al68buickgs Active Member

    Have 373 gears on an 8 inch rear in on a 68 Buick GS 400 with a 444 big block high rpm when cursing 3000 plus thinking of putting a gear vendor or Change out the gears in the rear and suggestions Oh it a 4 speed car?
  2. monzaz

    monzaz Jim

    Need pictures to ID rear first...No 8" rear 8.2 8.25 8.5 ??? Which one do you have... 10 bolt cover?
    Usually what will help sway what you want to do is whether you can even get parts for the rear.
    Next what do you expect from your car. tell us what your plans are for driving...drag racing, cruising, more freeway ... light to light action... This will aide in what ratio to choose and if the gear venders is a necessary part as that is an expensive option...

    J D Race
  3. Al68buickgs

    Al68buickgs Active Member

    Thanks I attach a photo of the rear end I will like to ride the car on freeway & maybe track action?

    Attached Files:

  4. BrianTrick

    BrianTrick Brian Trick

    That is a 71-72 8.5" 10-bolt. Very good rear. Lower gear selections are 3:08,3:23,and 3:42.
  5. monzaz

    monzaz Jim

    yEP X2 10 BOLT 8.5

    What camshaft profile do you have? with a 4 speed pretty much burn out is usually not going to be an just dump a bit higher in the RPM range

    What Intake and carb and ignition you running oh and size rear tire... ?
  6. Al68buickgs

    Al68buickgs Active Member

    It has a TA 413 camshaft, Edelbrock performance intake with electric chock 750 Holley double pumper carburetor, 15 inch wide tires in rear it had a manual Demon 850 double pumper but took it off gas reason?
  7. monzaz

    monzaz Jim

    413 camshaft has what profile? duration lift etc. If the duration at .050 get to above 230 you might have to stay on the steep side of the gearing you have a 4 speed and you want to be able to get 1st gear engaged smooth and with 3.08 it might lug out of the hole... ALL depends on what the profile is.
  8. Al68buickgs

    Al68buickgs Active Member

    I look into that since I purchase the car already modified ?
  9. monzaz

    monzaz Jim

    This usually is one of the hardest things to get over... Guys are always buying a car that has work already done to it and have NO clue what mods were done. They use terms like slightly iver stock mild buikld etc. MEANS NOTHING.... numbers and parts are key.

    actual name brand and type parts we need. Edelbock Intake performer, RPM torker Victor jr this is something we can work with. a 280 advertised duration cam or lunati 284 cam, etc we can even work with that. We can go to the inter net and google specs. A lot of time this is why car and truck are sold...people just can not work out the bugs or fine tune adjustments because they do not know what parts they are even working they keep throwing parts and money in areas that may or may not be the problem... shot in the dark... ALL thing can be fixed...we just have to know where the problem is. :)

    Jim Mitschke
    J D

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