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monzaz

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Everything posted by monzaz

  1. 3.23 is a pretty good ratio for all around driving. You can also get 3.42 and 3.90 gear sets from aftermarket Richmond gears. They will both fit the posi carrier you have. The axle spline count is most likely 28 as the 31 spline axle 12 bolt 'O' type are usually pretty rare. We can check all that when you bring it by. Jim 330 659 7117 Jim J D RAce.com
  2. If you are going TO a 8.5 from any other GM rear you will have to shorten the drive shaft about 3/4" ...But best to mount the rear and then measure and cut after fully installed. You will nee the combo u-joint. If you had a BIG BLOCK with the large rear end yoke in a 12 bolt you will be fine. Jim
  3. CF on the axle tube passenger side would be 3.31 posi rear differential in chevelle monte or el camino 1971 or 1972 and could be 1970 also but in 70 they usually used 3 letter code CCF. Jim
  4. How come you did not ask LEO??? He restores the cars. Jim
  5. What is the carb? Check the idle air bleeds for dirt. and also if it is a holley check the power valve. or pull the power valve and plug the power valve if the car runs with brake on then that was the culprit. Just more to check Jim
  6. No all 10 bolt bolt BOP or chevy 10 or 12 bolt rear interchange with nothing more than a u-joint swap. THE ONLY rear that will require drive shaft modifications shortening or lengthening(depending on which way you are swapping) IS 10 BOLT 8.5 REAR FROM A 1971 1972 SKYLARK OR OLDS CUTLASS. 12 BOLT OLDS, 10 BOLT 8.2 PONTIAC BUICK OR OLDS ALL USE THE SAME 1330 YOKE 12 BOLT CHEVY CAN BE HAD WITH A BOP YOKE SMALL 1310 CHEVY YOKE AND 1330 CHEVY YOKE. (MOST VERSATILE REAR FROM GM) 10 BOLT CHEVY ALWAYS USED THE 1310 SMALL YOKE WITH EITHER U-BOLT OR STRAPS AND 4 BOLTS. 10 BOLT 8.5 USED ALWAYS 2 STRAPS AND 4 BOLTS WITH A MECHR3 1330 YOKE EXCEPT FOR THE NOVA 8.5 WHICH AGAIN HAD THE SMALL 1310 CHEVY U-JOINT YOKE. Confused yet? lol. just ask I will help you. Jim
  7. Good luck on that stuff. Also remember the oold saying you get what you pay for. 25.00 I would say your going to be in the same spot again REAL SOON...lol. I can build you a real nice rear all new parts 10 bolt 8.2 for 899.00 3.08 3.36 3.55 3.73 4.10 your choice.
  8. 3959038NF is the casting number of the rear. Is a 1969 carsting for chevelle and elcamino...could be a early 1970 monte...But since there was a GM strike in 1970 most montes got the pontiac tempest 10 bolt 8.2 in the early first 1/2 build year. GM55 ??? 1234567890 are nothing more that check digits to compare other number cast into the housing. If you look in the webbing around the rear cover you will find the actual casting date of the rear housing IE - L 12 9 meaning L= 12 month december 12 = 12th day of the 12 month 9 = 1969 year on the axle tube passenger front tube between the spring perch and cast center section pig will be stamped in suffix code 2-3 letter and more 4 digit number and another letter code ...plus there maybe a second row under that it might have a E or nothing at all.
  9. double check the ratio... 3.42 was a 10 bolt 8.5 rear not the 10 bolt 8.2 normally found in monte carlo chevelle el camino chevy rears. This might be a Buick or Olds rear with bolt in axles and require a drive shaft shortening modification of about 3/4" to fit ...But it would be a strong rear diff and you have bolt in axle shaft ready for racing. We build alot of these 71 72 rears for the Buick guys and they run 455 modified engine with GOBS of torque. We do usually replace the 28 stock axles with 30 spline custom Moser axles for the race application. An posi alone on ebay or craigslist is 200-300 alone... your getting a whole rear for almost that. Worse case you resell the parts and make money...lol Jim
  10. I'll take the 12 bolt every time. And keep the money in my pocket. The stock 12 bolt is way stronger than any stock 9" Look how much money you need to stick into a Ford 9" to make it strong. All the aftermarket 12 bolt chevy rears do not even have any mods done to strengthen it...Same as it ever was. OH and your 9" is a 10 bolt that is what people KEEP FORGETTING...Dana 60 is 12 bolt , 8 3/4 mopar is 12 bolt As far as ring gear size ...does not mean a thing for drag racing as your going a 1/4 mile ...back in the day larger ring gears were made to bleed off the heat of towing and the rpms of the 2 speed trannies heat on the freeway etc. larger gears dissipate heat. ford has the smallest 1.313 pinion front pinion support blows off from the small bolts and thin casting. cases shatter... But I will say this they sure made alot of them and they are CHEAP... price and built wise (stock form). They only became popular because they are a drop out...and CHEAP to buy cause Henry flooded the market under every Ford, Lincoln, Mercury and Truck... MASS PRODUCTION If you look at any aftermarket 9" it does not have ONE stock part left...lol. because it was plain not strong enough. The aftermarket had to redesign the whole rear to make it truly strong. besides assembly is your biggest concern in just about any drive line parts Engine, trans, rear end... you can have all the biggest baddest parts and if you install them wrong you have big bad JUNK parts... Keep your car GM and be proud... It is your car and you can buy what you want...We are still free with choosing here in our wonderful country... I still have some freedom of speech too. Take care and have a great time on the drag race seen what ever you do choose to use... Jim
  11. Bob I am right here in town Richfield, Oh Give a call I will hook you up. Jim Mitschke
  12. Tim, I can offer you options on the price of clutches and springs we are a dealer for Randy's and JT diff. PLUS we have buy ins with Moser Engineering if you need better axles too. Jim All discounted for the site. Ask Leo
  13. if it is a 10 bolt 8.2 chevy yes plactic tag on the fill plug male 7/16 square (outie) If you have aopen diff (non posi) you will have the 3/8 female (innie) IF you have a 1970 with a 8.2 tempest (bolt in axle rear) you will have a posi tag that is metal and hangs off the rear driver side 5 oclock cover bolt. If you have a standard non posi tempest rear you will have a male 7/16" outie again. Hope this clears the fill plug deal. Take care, Jim
  14. monzaz

    trani linkage

    Well linkage is just mecanhical. It does not really do anything but select the gear from the outside lever on the tranny. So even if you had the lever all off like 1st was 2nd and 2nd was 3rd and so one it will still engage in the gear. Sounds like to me something inside the tranny is a miss...?? NOT GOOD. Could be as simple as the lever in the tranny was installed loose or rattle loose or the vavle body might be missing stuff essential to the workings. The only sure way to tell if it is the inners of the tranny or the external lever adjust ment is to full remove the linkage and jack stand the car with a brake and gas pedal (person) controller and you manually move the tranny lever into and out of each gear. If it all operates fine that way your linkage is cause the havoc. Good luck oh if it is not the linkage ...My GOD Bless you. That means dissassebly AGAIN
  15. If you scrap the passenger side front of the axle tube you will reveal a stamped in suffix code for your rear axle. This will tell you what gears and if it is a posi the date it was made and where it was made. Ok? Jim You get me those number I wil decode it for you.
  16. In 1972 Many small block 4 bbl carb cars received the 12 bolt chevy rear. Remember the next year was the big chassis switch to the corperate world. Every car use the same 10 bolt 8.5 rear and in 1974 the trucks were even in the game with the same rear...camaros novas all of them were 10 bolt 8.5 rears. Now as far as pontiac rears in a monte and other cars. That was because of the 1969 1970 assembly plant strike so I here. I was not there so i do not know first hand....lol. They were trying to get cars off the line with what ever it took. The 8.2 Buick Olds and Pontiac AKA B.O.P group rears all bolted and interchange except for a few miner u-joint switch out and maybe drive shaft lengths on a few depending on transmissions equipped with. 400 350 muncie etc. Then there is the CANADIAN factor....lol. Canadian cars used 12 bolt chevy rears as there heavy duty rears while the American BOP cars received the 12 bolt 'O' type and crazy goofy special GS 1968 -1970 8.2 with 12 bolt carrier bearing on the driver side and the standard load bearing on the passenger side carrier area. Sum it up. --- Please always check the rear for physical eveidence...NEVER assume a 30 to 40 year old cars has its original equippment under the car. Even if it DOES...it still may not be what it is suppose to be....lol. I am always here to help as are all the other rear diff GURUs here. Send a pic or pics and we will help ID that rascal and then you can buy with confidence and not waste time or money. Jim - J d Race.com 10 bolt 8.2 CHEVY gears are sold from 3.08 3.55 3.73 4.10 4.56 etc. I do stock them along with 3 seires posi Auburn or eaton . If you do have a 2 series do not dump it esspecially if your going to be a street bound car which most are. they sell a spacer KIT (kit meaning it includes the correct length bolts which are essential to proper installation ) that will make your 2 series into a 3 series and then you can bolt the 3 series ring gear to it by sandwiching it all together....I have used many and have had good success with them...do not listen to the hype. Good luck out there on all your projects, Jim
  17. All montes came with CHEVY c-clip 8.2 10 bolts in 1971 and 1972. In 1970 gm had some kind of strike and to keep the lines moving they used 10 bolt pontiac 8.2 bolt in axle differential (1970 only). 1970 -1972 12 bolt c-clip type differentials were also available option. The 8.5 10 bolt did not come out till 1971 and they were only found under the skylark and oldsmobile. NOW NOT to say that your car does not have one but anything can happen over 30+ years. ALL of these rears from 1968 1972 interchange with very miner changes such as u-joints and shorter or longer driveshafts. This is why just having the year is NOT good enough for rear differential or transmission or engine identification. Physical or factory casting number are a must...and even that may be unreliable. On differentials ring gear size, ring gear bolts size and count compared with cover bolt number, bearing part numbers, pinion spline count, yoke type, and axle retention are some of the ways to physically id a rearend differential. You can also use a ring gear spacer with the proper lenght bolts until you get the money for your 3 series unit. Proper install spacer will hold just fine on the street and minimal track use. Been tested already by me... engine transmission and rearend rely on good installation to get the most from your performance parts. With out attention to the small details the performance parts will not hold any better than stock. Good luck on your diff project if you need any help advise or parts (gears and posi rebuild kit) pm I will help you out. Or I think biggearhead does the same also. Jim
  18. I can get you a posi in there if you like...Just let me know or visit jdrace.com 12 bolt 3 or 4 series posi Yukon Brand eaton. Fully rebuildable for life clutch type unit. 379.99 plus shipping. Ask for pictures but they are brand new in the box.
  19. That is exactly what I was trying to get at. I guess if you want to go through all the work of relocating(replacing in some cases) the perches for the rear. You will also need to cut the drive shaft if you are doing this also...10 bolt 8.5 is 1" longer in the pinion housing area. your origial drive shaft will not work. Sounds like you should just find a better way and off the parts on ebay. 1971 1972 buick and olds a-body did come with 10 bolt 8.5 rears which will hold thoses gears and posi unit and will DIRECTLY bolt into your monte carlo. Hope that helps. I would just buy a 8.2 10 bolt posi and stick it in. less hassle. Good luck. Jim
  20. Get the numbers from the passenger side of the axle tube between the spring perch and the cast center section where the gears are housed. Should be stamped into the axle tube facing the front of the car. If you need parts I will be more than happy to help...bearings gears posi etc. Good luck, Jim J D Race
  21. Well the power traxx is a pretty good unit . You said it makes noise in the corners. Sounds like it is a lock right...Not a power traxx unit. The early style unit. I install alot of them for the weekend warriors around here and they love them. The exhaust is usually loud and does not bother them at all. There is NO ring and pinion ajustment with a LA locker(power trax, lock right ) like with a posi or detroit locker. Gears will improve the launch of any car for sure. Remember the more low end you gain the less top end you will have. evaluate what you what your car to cruise at and do then pick or keeep the same gear. Posi will improve traction of any gear choice you choose. If you need more help or parts email me I am always here. WOW 1600.00 and that was using your housing?...I have to start raising my prices...lol
  22. You will need some sort of lock up kit...I used the B &M one this way I can still race. Has a slide bar control panel with a led red and green on and off indication (2x3 inch in size) to control when and if you even want lock up at all. Runs off the speedo cable. Works great for me. Also like it because of less kick down at wider thottle opening for top speed capability. Good luck with the switch, Jim
  23. monzaz

    Axle Info

    The material used to make the axles is what makes them better or worse. We have all these fancy mixes of metal now to make them stronger. They all have fun numbers..like 4130 and such..lol alot of the stock axles were only external flame hardened. Now they have fully forged axles if you want. Remember strength comes with a price $$$.
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