spacers

70temp455
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spacers

Postby 70temp455 » Mon Apr 11, 2011 8:54 pm

What is your opinion, ideas and comments on using a spacer to upgarde a 2.56 series 2 posi carrier to a 3.08 or 3.23 gear.
Rumor has it that it isn't a wise choise because the are not safe and prone to failure.
I haven't purchased the posi unit yet and need to know about the spacer idea before I make the purchase.
Thanks Jim,
Andy

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monzaz
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Re: spacers

Postby monzaz » Fri Apr 15, 2011 7:17 am

WE have tested spacer plates and have come to the conclusion that it is NOT the spacers fault for most if not ALL . IT is usually install error. Spacer have been tested with Big block chevy to 12.00 AND SLICKS NO issues. Using the proper length bolts sold in a quality kit and torqueing the bolt properly and lock tight them it will do the job quite well for the street car even with hi performance engines.

There is a problem with your going from 2.56 to 3.08-3.23 range as there really is not a correct step spacer for this jump in the 8.2 PONTIAC BUICK OLDS. The 1/4" spacer will bring your spacer to the 3.36-4.33 carrier range. You would need less then half that thickness to do the job.

WE HAVE used a 8.5 spacer with a extra pack of 3/8" long ring gear spacer bolts sold seperately to do the job. You will need a spacer in the .150 .180 thick range.
CHEVY 10 bolt 8.2 goes from 2.56- 2.73 3.08 - 4.56 and is a almost .300 thick spacer plate.

BOP (Buick Olds Pontiac) has smaller series increments for its carriers. 2.56-2.78 2.93-3.23 3.36-4.33

So hope this info gets you the right parts.

IF you want more gear then buy the chevy 10 bolt 8.2 spacer plate and you can fit a 3.36 3.55 3.73 3.90 4.10 4.33 on your 2.56 carrier.

If you want the 2.93 3.08 3.23 ratio then you will need the 8.5 spacer plate and the 3/8 fine thread (24 count longer bolts sold separately...This is because the 8.5 kit comes with 7/16" x 20 LEFT HAND THREAD (reverse thread)

Good luck and please continue to ask questions on this if it does not make sense ...we will try to help you get through it. :) Jim
J D Race

sleeve396
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Re: spacers

Postby sleeve396 » Fri Sep 02, 2011 8:31 pm

Jim, I am trying to follow up on this informative spacer related thread and I have a question regarding a pontiac open carrier rear that presently has 2.78 gears and we want to run 4.11 gears. Can this be done using the common chevy 8.2 spacer?
If I am reading this thread correctly it would appear so. Now comes the crazy question,,,,
One of the old timer guys here is insisting that you can run a chevy 8.2 ring and pinion in a P style rear as long as you shim it correctly???? This is total news to me and having never ventured past a straight Ring And Pinion swap I hesitate to even try, then again the rear is here and so is a richmond 4.11 gearset for a chevy 8.2.
The car has been laid up for almost a year during the economic crush and the owner is trying to get it going on a budget, thats were I opened up my mouth and said the famous last words,,,,,OK,no problem I know a great website and.........the rest is history.
Incidently if this is a workable deal and you have the spacer and correct bolts and shim kit along with
the correct crush sleeve and seals consider it a done deal, Thanks again!

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monzaz
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Re: spacers

Postby monzaz » Mon Sep 05, 2011 6:02 am

YOU ARE reading correctly- THE 'P' 10 bolt 8.2 increments 1/8 step from 2.56-2.78 then 2.93 -3.23 then a final step to 3.36-4.33 and beyond where as the chevy has only one 1/4 series step increment to 3.08-4.88

SOOOO. If you use a CHEVY 8.2 DROP OUT PIG 55p and 8.2 integral housing NON DROP out Chevy. (same spacer about .250 thick) 3/8" bolt size ....YES - IF you use it with a 2.56 or 2.78 'P' 8.2 10 bolt carrier it will hold 3.36 3.55 3.90 4.33 AND aftermarket 4.10 4.56 4.88 etc.

If you want it to hold 2.93-3.23 you need to either machine the spacer or use a 8.5 spacer thickness with the 3/8 bolt size. Which will work close enough to get the job done. Jim
J D Race

sleeve396
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Re: spacers

Postby sleeve396 » Tue Sep 06, 2011 5:59 pm

As usual Jim you are The THE KING OF REARS....lol, I was arguing left and right about BOP gears being specific to BOP rears and the old timer kept insisting he had done it, Ahhh the wisdom of the aged, and then again the wisdom of JD RACE, thanks Jim, btw I will be calling tomorrow to get a shim kit for an 8.2 to go with those Ebay axles I got from you, thanks for being so easy to deal with!

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monzaz
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Re: spacers

Postby monzaz » Thu Sep 15, 2011 11:17 am

LOL... Yep I am 43 and still get the look from the older guys about knowledge... Like what do I know? and how could I know? It is just experience and many many disassembles and note taking.

Even BOP gears and chevy gears are interchangeable from housing to housing. You just need the correct yoke and seal combo of course along with the correct carrier series too. :) Jim
J D Race


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