Rearend questions

[skokie]

I have a 68 12 bolt 3.73 1/2 ton that I want to put a 307 into but I was told I need to change out the carrier. Still being new to this I need a translation. What is the carrier?

Thanks

[Rooster's 67]

the carrier is the part that the bearings and the actual ring gear bolts to the carriers locate the mounting flange at different "depths" for different ratios

[Rooster's 67]

probably just as easy to find a rear with the 3.07:1 gears already in it......everybody wants deeper gears
exspecially 3.73 and 3.43 gears
just swap with someone

[skokie]

Thanks Rooster's 67. So In order to change out to a 307 I would need the new carrier, ring and pinion gears or just get a entire rearend with a 307 in it and swap out the whole thing?

Thanks

[Rooster's 67]

to do a gear swap you will need a different carrier and of course the gear set,pinon bearings(inner and outer) and carrier bearings(2) talking about 300 plus dollars plus labor to have it set up. most shops will charge at least 3hr labor($70 an hr. at my shop)(unless you do it yourself)

I can see where a swap would be much cheaper or even buying a used rear with the gear you want?

depends on what you want to do.

[lukecp]

Swapping the whole rearend would be far easier. You can easily do it yorself with a pair of jackstands, a floor jack, and a day of labor. The hardest part is bleeding the brakes and even that is easy.

Swapping gears is not usually a job for a novice, since the clearances must be very tight in a rearend, and if they are off by to much, it will self destruct.

However, i have had poor luck with used junkyard rears. I put one in my truck a few weeks ago. I inspected it well at the junkyard, pulled off the cover, and all looked well (no metal flakes in the fluid, no play in the pinion bearing, gears looked great). A week after the swap it started howling, and now i need another.

Getting your rear rebuilt is a surefire way to know you will have a relialbe rearend.....but you may get lucky with a used rearend. Remember, they are all over 30 years old and most have several hundred thousand miles on them.

BTW, swapping rears is much cheaper....$150 for a used rear, and $25 for new U-bolts and you should be set

[Rooster's 67]

yellow at least you got a rear you can build up now. ya know,,, between classes and all

[skokie]

Thanks for the info. I will be going to the junkyard this weekend looking for a few other things. What year could I be looking at? Does it have to be 67-72 6 lug? I would prefer to stay with a 6 lug if possible.
thanks

[lukecp]

Yeah, i may just try to rebuild this one myself.

BTW, sorry i haven't gotten back to you yet on the old rear, i've been away from the board for awhile and forgot about it. I think i will keep it for parts, or rebuild that one and stick it in my truck.

[Rooster's 67]

yellow... not a prob keep it and build it. it is a neat learning tool just get the right tools to do it.

Skokie you want a rear out of 64? to early early 70 for a six lug with the trailing arm suspension

I think 64 up work but most of the older ones had 4.11:1 gears
for sure 67-early70 will work and if you find a 6 lug

[lukecp]

Originally posted by skokie
Thanks for the info. I will be going to the junkyard this weekend looking for a few other things. What year could I be looking at? Does it have to be 67-72 6 lug? I would prefer to stay with a 6 lug if possible.
thanks

If it is a coil spring rear, any 67-70 coil spring rear will work....they are all six lug and will bolt right in.

Should be a fairly easy fing.

Pop the cover and the teeth will be stamped on the ring gear...it will say 43-14 if it is 3.07, 41-11 if it is 3.73, and 41-10 if it is 4.10.

[boraxman]

Originally posted by skokie
Thanks for the info. I will be going to the junkyard this weekend looking for a few other things. What year could I be looking at? Does it have to be 67-72 6 lug? I would prefer to stay with a 6 lug if possible.
thanks

67-70 are 6 lug. 71-2 are 5 lug.

[magoo72]

i am currently going through this process,i have 3.73 and i bought a rear end at a yard that had the 3.07 i wanted.put new seals and bearings,disk brakes and i will be good to go.
planning the swap over during speed week in feb. i will try and post a pic,,,if the board will let me!!!!!!!!!!!
mrmagoo
well it still wont let me,that makes me very very angry!!!iam gonna go do a burnout!!!!!!!!!!!!!!!

[skokie]

Magoo72. Yes please post em. If you have any issues with posting the pics you can email them to me and I can post them for you. Post that burnout to.

[magoo72]

i sent you the pics via e mail
mr magoo

[skokie]

magoo72 pm sent.

[1972C10]

Originally posted by skokie
Thanks for the info. I will be going to the junkyard this weekend looking for a few other things. What year could I be looking at? Does it have to be 67-72 6 lug? I would prefer to stay with a 6 lug if possible.
thanks

Ive got a 6 lug rear complet with the carrier and gears let me know if you need it