Hi Please tell me. Where can i find parts for my 1970 Buick gs 455 stg1 rear axle. Coded with: "oo". Need the complete differential posi carrier because the gears are broken. Also need the bearings and shims. I think the ring and pinion gears are fine, but i wil check. Thanks Eivind
Ok what I need to know is on the posi unit are the carrier bearings two different sizes. Bearing kits we have Axle bearing - 1970 set0 or a9 yes axle bearing GS only 68 69 will have RW507GR (VERY VERY HARD TO FIND AND EXPENSIVE) gears Fabcraft (3.42 3.64 ) but we are at the mercy of his time frame posi unit I have eatons for 2.73 and 2.83 gearing and Auburns for 3.23 3.42 gearing and 3.42 and 3.64 fabcraft gears. I can make a 3.64-5.00 posi unit from a eaton BUT is usually very expensive...more machine work again. Hope this helps. Jim J D
The rear end housing is a original 3.42 the pinion appears to be correct to the housing 12 teeth The housing is a 10 bolt 8.25 68-70 era. Only Fabcraft gears will fit that we helped get made. We are at the mercy of fabcraft when and if they make these 3.42 or 3.64 gear sets. I (J D) have Posi units for 2.56 2.73 2.93 and 3.23 - 3.42 GM gears and 3.42 -3.64 Fab craft gears AND I can custom make a 3.64-5.00 ratio carrier also BUT collect your dough for that one. Rebuild kits are available from J D Axle bearings for the 1970 are A9 or set9 68 69 rw507cr (for standard (NON GS ) rear are available too The GS 68 69 axle bearing (rw507GR) are the nightmare for the 68 69 GS rear.... IF you cvan find them they will be big money or might not have the retaining ring etc. THE POSI in the picture looks like a PONTIAC NOT a Buick - Does it have a larger driver-side carrier bearing than the passenger? Jim J D
Thanks Jim. Yes, the outer diameter of the driver side carrier bearing are larger than the passenger side, please se the picture of the outer bearing rings in my first post. If the rear axle is not the matching to the car, i could buy another axle. If the axle are correct to the car i would like to use it. Maybe i could use the carrier bearings that i have. It is the gear set in the posi unit that are chrunched. Is the "oo" stamp at the rear axle "buick only" ?
what are the ring gear numbers ? Do they match the pinion? You said they got crunched??? Are they bad?
This is the numbers: Pinion gir: 1231486 12-41-GM, Ring gir: 1382744. 41-12 GMC R. The "teeth" in the posi unit are bad, see attached pictures. I can try to tske som more photos. It is 3:42 ratio, i belive this is correct for a stg1 car with ac. -Eivind
Jim, I spoke with Dave recently,and they are making another run of the gears sometime in February/March. They decided to make runs of both 3:42 & 3:64. He also said that one of the Buick vendors will possible get the exclusive to sell these,so if you want any directly from FabCraft,now is the time to reserve them.
I have a set of the Fabcraft gears that I bought when they made the original run. They are 3:42's. I would sell them for what I in them. If interested, pm me. Thanks, Larry
The larger carrier bearing is a SET36. The smaller side is the LM501349/LM501314. I have used the 71-up 8.5" Eaton posi units in these. The inner diameter and bolt circle of the Buick ring gear is the same,and a direct fit. The newer 8.5" posi units have the larger bearing hub on both side. I installed the SET36 on the driver's side,and the LM102949/LM103911 on the passenger side.
Yah that figures. That deal never went a good way for me from day one..lol. I was suppose to get a deal on them when I first was helping...That never happened. So I see you all will be paying a great premium on those gears T/A was charging almost 600.00 a gear set last time I looked. They still can not take the posi away from me as i made those for him to use in the builds. lol. Jim Prices from t/a are as follows 540.00 for the gears 544 for the posi and 199 for the rebuild kit...and that kit does not include axle bearings and seals. I was selling the gears at cost as long as you bought the posi and rebuild kit from me. So there you go... Does anyone know what the cost of the gears will be this time? AND the big thing is WHO is making the gears since RICHMOND is no longer RICHMOND???? Jim J D
I see the teeth - Oh boy... You might as well open the posi and see how bad everything else is. I MIGHT have a good side gear if it is only one. Jim
At the time,I remembered,but now I don't. I know it was somewhere in the northern US. I reserved mine directly from them.
Thanks for all responce. I will open up the posi unit and take a look. Would this (like BrianTrick say) be the easiest and cheapest way for me to fix the rear axle ? And what about the shim set and bearing for the pinion. Are the Eaton posi unit complete including the gears? I may also need onw drive shaft, if you look at the pictures the splines are twisted, are the drive shaft avalible ? Thanks
Hi Jim. Please see attached pictures. There are two gears that i can tell that are broken, i have not dismantled and cleaned the whole unit, so it may be more that are worn. The pinion and ring gear looks ok for me, but i am not a expert, so i will ask some people here at home. Jim, can you send me a pm or e-mail with prices for parts. This is what i think i need: Posi unit 3:42, pinion bearing and seal, pinion shim and collar, shim for carrier, bearings for carrier/posi unit, left side drive shaft, wheel bearings and seals both sides, sealing for end cover. Thanks Eivind
Need that pinion shaft size for the spider gears .733 or .795 diameter. Use a slide caliper to measure it. This way I can match up a spider gear. I have all the parts except for the axle bearings. Brian had a buy out of a company that had the rw507GR bearings 1.437 inner diameter and larger outer diameter. Originally a Wagon bearing. Gs uses the same as the Wagon bearing. PLEASE measure your axle shaft diameter also. You want to be sure before shipping parts that may or may not fit. Your ring and pinion look fine. Soak the parts in kerosene it will clean and coat the parts so they do not rust. Send pictures of the posi cones top and bottom and inside the posi case halves too. Jim
Cone issues the unit needs work I can see the cone has bottomed out on that posi. You will need to machine that cone and the tower in the case...probably on both sides. Check the red arrows for the trouble area. Jim
