![]() |
![]() |
#1 |
Registered User
Join Date: Feb 2005
Location: Portland OR
Posts: 74
|
Help, need posi.
I have a 67 short step with the original 12 bolt ..... It has a 396 and I'm wearing out the passenger rear tire
![]() |
![]() |
![]() |
![]() |
#2 |
"Trucks with Class"
![]() Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,132
|
Re: Help, need posi.
Well you will probably have to cut & weld on new spring perches and shock mounts. The ebrake cables may not hook up, and the front yoke is probably bigger than the 67.
Measure the width before you begin to see if it is close. You will get a posi and better brakes! If you can do the work yourself...go for it. If you have to pay someone, get an estimate first. Let us know how it turns out. |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Feb 2005
Location: Portland OR
Posts: 74
|
Re: Help, need posi.
Thanks Pickmup..... good points, my welding skills are limited so I would probably have it done..... considering cost, & better brakes aside, would it possibly make more sense to have positrac installed in the existing rear end?
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: May 2005
Location: South Mississippi
Posts: 81
|
Re: Help, need posi.
Make sure your pinion angle is the same as the output shaft angle when you weld the new perchs. There is probably a thread in the FAQs that address this. Love my posi. Steve
__________________
1969 C10 Long Step,355,700r4w/lockup, HEI,Weiand,750 Performer,1.6 rockers,Camel Humps,Comp 262Extreme,Hedman,2 1/2"pipes, tele/tilt,SunRoof,ps,Disc pb,ac,Cragar,eaton,Corvette style roll pan, Bowtie louvered tail gate,lowered 2/2. |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Jan 2006
Location: Kaufman, Tx
Posts: 827
|
Re: Help, need posi.
Can't the posi unit in the newer rear end be used in the old one? I think it will fit from one twelve bolt to another if the axle splines are the same (30?). You would have to set up the gears again, or have it done, but no other changes should be necessary. Someone correct me if I'm wrong here? I guess it would depend on the cost of the burb rear end, and the cost to swap carriers vs. buying a new posi unit, and doing the gear set-up.
Jay
__________________
You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. If a hammer doesn't fix it, you have an electrical problem! Slot Cars, 1:24 Scale, 100MPH@100,000RPM, fastest things on wheels! ![]() |
![]() |
![]() |
![]() |
#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
|
Re: Help, need posi.
well if you were to pay to have your original rear overhauled with new gears new posi seals bearings etc expect to pay in the neighborhood of $1000-$1200 so paying a welder to do the mounting brackets and having the driveshaft rebuilt and modified would give you the better brakes at a cheaper price in the long run but first make sure the width of the newer axel is about the same width of the original
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
![]() |
![]() |
![]() |
#7 |
Blank
Join Date: May 2005
Location: Southington, CT
Posts: 221
|
Re: Help, need posi.
does the 67 have leaf or coils? if you have coils you'll run into problems with the trac bar
__________________
![]() 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Feb 2005
Location: Portland OR
Posts: 74
|
Re: Help, need posi.
Thanks for the replys guys and all the help... yes, it does have coils.... not any easy answers here.... the later model posi rear is $200 but, sounds like I may be better off waiting for a posi unit from a coiled spring, earlier model... what years should fit with little or no mods.... anything earlier than 67? Up to 72?
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Jun 2005
Location: Scottsdale, AZ
Posts: 615
|
Re: Help, need posi.
I had installed a posi unit with 3:43 gears new axles ,all the seals and used CPP rear disc brakes on my 72 and it cost about $1500.00. I very happy with the performance now.
|
![]() |
![]() |
![]() |
#10 |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
|
Re: Help, need posi.
IMHO.. I would do it the easy way.. with a Powertrax Lock-rite carrier.. you just pull off your rear end cover drop out the spider gears and pop in the lock-rite posi.. it can be done with simple hand tools and a couple of hours time..
Heres a link to them at Summit Racing http://store.summitracing.com/partde...5&autoview=sku Last edited by Livrat; 06-02-2006 at 01:17 AM. |
![]() |
![]() |
![]() |
#11 | |
JamesChurch13
Join Date: May 2006
Location: Edwards AFB Sunny California
Posts: 151
|
Re: Help, need posi.
Quote:
![]()
__________________
HG/FTW!!! ![]() Current vehicle collection: 1968 Chevy C-10 SWB Fleet Side, 327ci, TH350 (MD) 1987 Chevy Dually Quad Cab, 427ci, TH400 2008 Buell XB12SS, 1203cc 2006 YZ450F Wheelie Machine! 1997 Suzuki Bandit 600cc And the Wife has some cars I pay insurance on and use to transport the kids!(01' Grand Cherokee and 06' Pontiac Grand Prix) |
|
![]() |
![]() |
![]() |
#12 |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
|
Re: Help, need posi.
About all else you would need to replace is the cover gasket and the 90wt oil..
But no it will not make your 4:11 a 3:73.. the only way to do that is to change gears |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
|
Re: Help, need posi.
All the posi will do is make you wear out both rear tires instead of just the one! Just keep your foot out of the gas and save yourself some money.
![]()
__________________
For every person with a spark of genius, There are a hundred with ignition trouble. ![]() |
![]() |
![]() |
![]() |
#14 | |
I make Models
![]() Join Date: May 2005
Location: Bucks, PA
Posts: 626
|
Re: Help, need posi.
Quote:
![]() ![]() |
|
![]() |
![]() |
![]() |
#15 | |
JamesChurch13
Join Date: May 2006
Location: Edwards AFB Sunny California
Posts: 151
|
Re: Help, need posi.
Quote:
![]()
__________________
HG/FTW!!! ![]() Current vehicle collection: 1968 Chevy C-10 SWB Fleet Side, 327ci, TH350 (MD) 1987 Chevy Dually Quad Cab, 427ci, TH400 2008 Buell XB12SS, 1203cc 2006 YZ450F Wheelie Machine! 1997 Suzuki Bandit 600cc And the Wife has some cars I pay insurance on and use to transport the kids!(01' Grand Cherokee and 06' Pontiac Grand Prix) |
|
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Feb 2005
Location: Portland OR
Posts: 74
|
Re: Help, need posi.
Thanks for the tip Livrat, that's the kind of alternative I was looking for.... as far as "keeping my foot out of it", with the big block, it's extremely difficult to not to turn'em over from a stop light.... I really have to baby it, any moisture on the pavement, fergettabout it
![]() |
![]() |
![]() |
![]() |
#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: Help, need posi.
what's the point of a big engine if you don't have fun? If you wanted to limp from light top light you could do that with an inline blowing blue smoke and hittin on 4 cylinders.
![]() Tail lights and tire smoke! ![]() |
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
|
Re: Help, need posi.
You complain about 'wearing out' the passenger tire. Like I said a posi wont help your problem just cause you to wear out both tires. Now the way you wrote the question, it sounded like you wanted to stop wearing out a tire. The Big Block isnt the problem they way you are driving it is. Unlike what you said.....It isnt hard to "NOT" spin the tire. I have a Big Block and a Small block truck so I know what I am talking about. Yes you can have fun with it and still make it driveable without smoking the tire every time you leave a stoplight. My Small Block will smoke my big block the way it is built and I can drive it without wearing out the tires. If you are just asking will the later rear end fit in your truck, Yes it will but like other have stated here, It will need to be modified. Now if you want the tires not to spin so easily, change to a higher gear ratio. Of course a posi will help with a gear change, but just a posi alone wont do much good. It would be easier if you can find a complete posi rear end from a truck just like yours instead of making one fit. And if you never had a posi rear and you think you have problems on wet pavement now, Just wait until you light em up when it is wet with a posi!
And it is a lot more fun using money to buy other things than just tires! ![]()
__________________
For every person with a spark of genius, There are a hundred with ignition trouble. ![]() |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Feb 2005
Location: Portland OR
Posts: 74
|
Re: Help, need posi.
Hey 70 short/step, the complaint about the tires was tongue in cheek
![]() |
![]() |
![]() |
![]() |
#20 |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
|
Re: Help, need posi.
Well the posi is just a start. Look at gearing and maybe a better suspension. My truck has a 4 link setup wih coil overs. Hooks up Great! But if you are a tight budget....look into gears and a posi. But even that will be expensive. Look around for a direct bolt in posi rear. I think that would be the cheapest for you. Good Luck.
![]()
__________________
For every person with a spark of genius, There are a hundred with ignition trouble. ![]() |
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
|
Re: Help, need posi.
If you decide to put the later posi carrier in your current rear end, make sure the carrier is compatible with your gear ratio. What is your current gear ratio?
You don't have to completely overhaul the rear end if yours is in good shape. You have to put your ring gear and side bearings (new bearings are highly recommended) on the posi carrier, and then the backlash has to be set, which shouldn't set you back too much if you do the scut-work & leave the backlash to a pro. Check the axles for grooves (grooves are bad, ng'kay) where the outer bearings ride, and use new seals. And although you'll wear out both back tires now, it'll take them twice as long to wear out. ![]() Last edited by jimfulco; 06-02-2006 at 10:00 PM. |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|