Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Car 12 bolt in truck

Discussion in 'The Garage' started by MT wheeler, Nov 14, 2005.

  1. MT wheeler

    MT wheeler 1/2 ton status

    Joined:
    Nov 14, 2005
    Posts:
    197
    Likes Received:
    0
    Location:
    Billings, MT
    Newbie here and was looking for information on 12 bolts. I tried searching and didn't come up with what I wanted. Maybe I searched wrong, I don't know. What I am after is, has anyone installed a car 12 bolt in their truck? :confused: I am looking to put in a car 12 bolt because of the gear selection available and it also has a larger pinion diameter for more strength. Which cars had the same or close wms-wms as the full size trucks? :dunno: Any info is greatly appreciated.
     
  2. guido666

    guido666 1/2 ton status

    Joined:
    Feb 16, 2005
    Posts:
    788
    Likes Received:
    1
    Location:
    Longmont, CO
    Cars are too narrow if I remember.

    There shouldn't really be much difference in parts availablility.
     
  3. steve_kibbe

    steve_kibbe 1/2 ton status

    Joined:
    Feb 4, 2004
    Posts:
    2,895
    Likes Received:
    2
    Location:
    Spartanburg, SC
    might want to consider wheel bolt pattern too :o

    I'd just buy a 14sf or 14bff and forget a 12 bolt :D
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    They are harder to find , if original , would fetch pretty penny on E-bay . Use the money from sale to buy gears and such for a truck axle .


    What you could do , if you had money to burn , and wanted to be different , is an aftermarket 12 bolt , Moser makes new car housings , added to truck width tubes :D
     
  5. MT wheeler

    MT wheeler 1/2 ton status

    Joined:
    Nov 14, 2005
    Posts:
    197
    Likes Received:
    0
    Location:
    Billings, MT
    This is kinda what I was thinking. Correct me if I am wrong but truck gear ratios are only available to 4.56 and car ratio has a much better selectio. I am trying to stick with the 12 bolt for the ground clearence, weight, and wheel issues. I was under the impression that 12 bolt axles are 12 bolt axles so I was thinking I could slide my truck axles into a car housing if I found the correct one (impala maybe?).
     
  6. guido666

    guido666 1/2 ton status

    Joined:
    Feb 16, 2005
    Posts:
    788
    Likes Received:
    1
    Location:
    Longmont, CO
    The narrow rear would help turning radius, might cause more rollovers too. :crazy:
     
  7. bigjbear

    bigjbear 1 ton status Staff Member Moderator

    Joined:
    Feb 18, 2000
    Posts:
    13,966
    Likes Received:
    448
    Location:
    Marietta GA
    The truck are avaliable to at least 5.38:1. The FF14B is the one that only goes to 5.13:1. If you are going to spend the money on a custom housing i'd use a D60. Just my two cents.
     
  8. MTMike

    MTMike 1/2 ton status

    Joined:
    Feb 10, 2005
    Posts:
    2,992
    Likes Received:
    0
    Location:
    Billings, Montana
    Welcome to CK5 and hello from Billings!

    I too would suggest looking for a 14 bolt instead... stronger, cheaper & more available (especially around here) I have a buddy in Laurel who had one w/ 4:10s for sale for pretty cheap... if you want I can find out if he's still got it.

    Mike
     
  9. Lonnie P

    Lonnie P Registered Member

    Joined:
    Feb 7, 2005
    Posts:
    28
    Likes Received:
    0
    Location:
    Pittsburgh, PA
    Leaf spring 12 bolts were only available in high performance Camaro/Nova They are very narrow. By the time you modify it, you will spend more money than using something else. A custom built race style 12 bolt will run $2500-$3000. If you want to spend this much, a race style D60 will cost the same for a bulletproof unit.

    Option 1:
    Install the car gears in your existing 12 bolt. A conversion bearing is available to do this.

    Option 2:
    If you dislike the 14bolt, get a used D60 as mentioned above. Thay are much stronger than a 12 bolt & relatively easy to find for a decent price.
     
  10. stano

    stano 1/2 ton status

    Joined:
    Jan 24, 2005
    Posts:
    130
    Likes Received:
    0
    Location:
    Iowa
    1965 to 1970-72 impala 12 bolt rear end (8.875 ring gear dia.)

    58 1/4" over all of tube wideth

    31 15/32" axle shaft length both

    bolt circle is 5 on 4 3/4"

    Pinion bearing dia. 1.625" I think that truck 12 bolt rear ends are bigger in the pinion bearing and will not interchange with car???

    30 axle spline

    thank you
    stano
    87 K5
     
  11. stayaway

    stayaway Registered Member

    Joined:
    Aug 1, 2005
    Posts:
    59
    Likes Received:
    0
    Location:
    georgia
    chevelle ?
     
  12. Lonnie P

    Lonnie P Registered Member

    Joined:
    Feb 7, 2005
    Posts:
    28
    Likes Received:
    0
    Location:
    Pittsburgh, PA
    The Impala rears are all coil spring so you have to modify this. You will also need axles & brakes to make it work unless you want to run car wheels & puny brakes.

    The pinion diameter of the trucks are smaller at 1.438" making it weaker than the car.

    Add a set of gears, locker, spring perch modifications & it get expensive very fast.
     
  13. stano

    stano 1/2 ton status

    Joined:
    Jan 24, 2005
    Posts:
    130
    Likes Received:
    0
    Location:
    Iowa
    1965 67 chevelle

    54 1/4" over all tube lenght
    29 9/16" axle
    30 spline

    68-72 chevelle

    55 1/4" over all tube length
    30 1/8" axle
    30 spline

    camaro and nova smaller

    thank you
    stano
    87 K5
     
  14. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,540
    Likes Received:
    930
    Location:
    Massachussetts
    Blasphemy...

    As a side note--we sold a Ford station wagon 9" rear end to a guy with a 75 Chevy 1/2 ton 2wd pickup at the junkyard--it had leaf springs,and the pads lined up so close to the chevy ones it bolted in,(just had to pry the springs out a tad)-and it even turned out to be a posi,with 3.40 gears if I remember right..I think the wagon was a mid 70's LTD,or Mercury "Colony Park" full size wagon (it was a "woody",with the fake woodgrain wallpaper on it :haha: )--it even had 5 on 5" bolt pattern.which matched the chevy's original 2wd lug pattern.. :crazy:

    The driveshaft didnt fit anymore though..the guy took the wagon's drivshaft,and he had a machine shop chop it,and mate it to his original one..I think he could have found one that would have fit had he looked around the yard some more..I think the wagon used the same "outside clip" U-joint as the chevy truck did--it was the chuck on the ford rear axle was longer than the GM axle was that caused the driveshaft dilema.. :crazy:

    I bet some guy is out there somewhere, who bought that truck,wondering WTF his Chevy pickup is doing having FORD brake shoes in the rear ..or why he can't "pull the diff cover" like the book says,to change the lube or replace wheel bearings! :what: :dunno: :screwy: :rotfl:
     
  15. SUPER'BURB

    SUPER'BURB 1/2 ton status

    Joined:
    Jan 9, 2005
    Posts:
    929
    Likes Received:
    2
    Location:
    Mountain House, Ca.
    Or go 4 link :D
     
  16. MT wheeler

    MT wheeler 1/2 ton status

    Joined:
    Nov 14, 2005
    Posts:
    197
    Likes Received:
    0
    Location:
    Billings, MT

    I thought that too. I did some checking on the internet and found the truck pinion was acutally smaller :confused: I would have figured it to be bigger being in a truck and all. Maybe I was misled--then again if it is on the net it must be true right? Ha Ha :haha:

    Maybe I will just go with the 14 bolt. I was unaware that 5.38 gears were available. I thought it only went to 5.13. That makes a difference in my book. I already have the gears for the front so that would work for me.

    Oops I though I read 5.38 for a 14bolt. Guess my eyes are bigger than my stomach. :doah:
     
  17. MT wheeler

    MT wheeler 1/2 ton status

    Joined:
    Nov 14, 2005
    Posts:
    197
    Likes Received:
    0
    Location:
    Billings, MT
    I would be interested in that 14bolt MTMike. I'll send you a pm Let me know if he still has it and what he wants for it. Thanks. :laugh: I can be reached at ericsscout@yahoo.com
     
  18. jarheadk5

    jarheadk5 1/2 ton status

    Joined:
    Mar 6, 2000
    Posts:
    4,389
    Likes Received:
    0
    Location:
    PA
    True. The truck 12B pinion shaft diameter is around 1.3 - 1.4". The car 12B pinion shaft diameter is 1.7-something. IIRC, the truck 10B has a bigger pinion shaft diameter than the truck 12B....
     
  19. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    [knock on wood] I know they are smaller , but how come I ain't chucked one yet , my tranny shifts hard :wink1: [knocks on wood ]
     

Share This Page