I am installing a posi unit (an upgrade) in my original rear end 68 GS400 and keeping the 2.92 gears. When I took it apart it only had a .199 shim on each side, this will not work with the new carrier. Where can I get a shim kit with the 2 different diameter shims for each side? I am hoping Monzaz will chime in.
Where did you get the posi? Original or aftermarket? 12 bolt chevy shim pack will do the driver side and any 10 bolt gm 8.2 8.5 even 7.5 will do the passenger side Brian or I will have the shim you need.
I purchased it new from you last year, I sent you a pm as well. The original carrier had a .199 single shim on each side and this is too much for either with the new carrier, it will need less than this on each side. ratech shows shim pack from .440-.504? that is to thick. I assume I will install a service shim on each side and adjust with other shims?
No we have shims that are multiple thicknesses just PM me an address if they did not come with the carrier that should have. Jim Remember ti does not matter if the shims are equal on either side...ONLY the backlash makes a difference. .007-.010 for used gears is acceptable. If you have .170 on one side and .210 on the other than that is what it will be. Most factory rears have at the very least .010 difference from one side to the other on shims. I do not run into very many where the shims are the same on both sides... will get them out to you ASAP. Jim J D
pm you my address, and I appreciate you taken care of this, great customer service. I thought it was odd when I pulled it apart and measured the shims and they were the same. Question, once I find ZERO preload and correct backlash (I measured at .008 before I tore it apart) how much shim should I add to each side for a starting preload adjustment. Is there a standard additional that works well, or does it have to be measured as rotational torque, and what should it be with old pinion bearings and new carrier bearings? Since I did not replace my gears, just upgraded to the posi.
monzaz, got the shims today, that you very much! once I have it shimmed and backlash correct, how much should I add to each side to get correct preload?
Kind of Grey area... couple thous on each side... All depends on what you need for backlash too. Many factors. I always use the 'if you can pull the carrier out by grabbing the ring and pulling it out it is too loose.' and ' if you are destroying shims to get them in your too tight. ' Make sure you are putting the thicker solid type shims in last and if you have a stack of skinny ones install them all the way down first. Jim J D Race
installed the carrier tonight and ended back at original backlash of .008, could only get the thickest shim on pass side which measured .103 and drivers side at finished out at .160. With the original pinion bearings and new carrier bearings I measured the preload at 10 inch pounds, but I did not measure original before I took it apart. I could not get any additional shims on the passenger side as the smallest in the pack was .010. I had to tap the thick (.103) in and could not pull the carrier out by hand. The original carrier had just one thick shim on each side and were equal at .199. original carrier: dirvers side .199 pass side .199 back lash .008 new posi carrier from monzaz drivers side .160 pass side .103 back lash .008 preload 10 inch pounds just wanted to throw this out there and see if anyone had any feed back before I reinstall my rear axle. Thanks
as long as the backlash comes out correct the carrier shims are what ever is needed. Remember this si a retro fit carrier so it will be slightly different than your original carrier width and offset. You are fine - you would worry if you did not have any shims on one side and all of them on the other. .008 should be good...How did it spin after getting the caps torqued to 60 ft lbs? should feel smooth both ways forward and reverse.
it spun good after torqued down, was just worried that it may not be enough preload, but there is no way to get a .010 shim on either side to add more. so since the back lash is good I guess ill just roll with it. thanks again
You have to remember the shims are different sizes from .010 up ...some are .012 or .015 so to move it .005 you would need to remove a .010 and replace it with a .015 there you moved up .005 in thickness. Also you always want to use the thickest shims always first to get he number thickness you need IE do not use 10 .010 shims to get a .100 pack...Use 2 .050 or 1 ..050 and 2 .020 and 1 .010 always put the thinnest shims to the inside of the pack and the thicker ones to the outside or the thin ones sandwiched. Jim
