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Recent content by john-9

  1. J

    Help with pinion seal!

    pinion seal for the 741 and 489 cases are the same Timken 5126 or SKF 18708 ,, your 742 case uses Timken 7216 or SKF 18912 ,, these are rubber seals i use them all the time on my builds even though it states leather on some listings ,, i don't think anyone has made leather seals for a very...
  2. J

    8 and 3/4 yolk

    741 and 742 cases use shims to set the pinion bearing preload so just remove the yoke change the seal if needed and reinstall the new yoke and torque the nut down to 240 lbs/ft . on 489 cases no way to tell if it has the solid sleeve unless you tear it apart ,, cases from the factory use a crush...
  3. J

    742 case 8-3/4 pinion bearing part #.

    i will give you both numbers for the 742 pinion bearings HM803149 cone ,HM803110 race for head bearing ,,, HM89443 cone , HM89410 race for the small bearing near the yoke ,, if you ever need differential bearing part numbers again go to Ratech Manufacturing website all they sell is bearings ...
  4. J

    741 yoke dust shield

    Mancini Racing used to sell them ,, but you should be fine without it ,,, now is it my eyes or optical illusion but does the pinion seal in picture #2 of post #7 not look fully seated .
  5. J

    Yet another 8-3/4 setup question. 3.73

    no shim ?????? pattern needs to be improved -- lets start from the beginning which case are you using ,,, 489 start with a 0.030 pinion shim ,, 742 and 741 start with a 0.090 pinion shim and set your preload and backlash then check the pattern ..if too much toe ( inner part of tooth ) remove...
  6. J

    Yet another 8-3/4 setup question. 3.73

    you are too high on the coast side and too low on the drive side ,, start by pulling .003 out of your pinion shim thickness ,, set backlash to spec .006 - .008 and recheck pattern ,, keep pulling out shim ( .003 at a time ) until the pattern is centered on the drive side ,concentrate on getting...
  7. J

    Which carrier do I have?

    the sure grip is 1969 and up unit ,, case could be 741 or 489 ,,, as stated above look at the case near the yoke for the part number -- drive pattern on your gear is terrible and the coast doesn't look any better .i would adjust your shim selection to improve the drive pattern if you want that...
  8. J

    742 Shim Kit

    Ratech Manufacturing sells individual shim kits available thru Summit Racing ,,,, for the 742 case you need Kit # RAT 1108 pinion shims and Rat 1107 pinion bearing preload shims. they make and have shims and bearings/kits for most popular differentials. i use Ratech's site for info and parts...
  9. J

    489 gear pattern setup results

    there usually is some difference between a used set up bearing and the new bearing -- best way to determine that would be to measure accurately from the carrier saddle ( boss where the bolt attaches ) down to the head of the pinion with the .027 shim installed , mark the point on the pinion...
  10. J

    489 gear pattern setup results

    for sure the .027 shim shows a better pattern , contact pattern on the drive and coast sides covers more of the tooth -- you can see with the .029 shim the drive side pattern is fading and the coast side as well -
  11. J

    489 gear pattern setup results

    i agree .027 shim shows the best drive and coast pattern looks to be a text book excellent pattern -- your backlash at .006 is fine -- i always set backlash at the minimum figure .006 - .008 because once you run the gear set the backlash will usually open up by about .003..
  12. J

    What weight oil should I use in my 67 Coronet's 8 3/4 axle?

    i have been using synthetic oils in my differentials , engines , transmissions since the early 90's in every vehicle i've owned and still own ( 1977 F150 , 1972 Mustang ,) and the wife's Liberty , Grand Cherokee , Dodge Caravans etc. she's owned including lawn mowers and snow blowers and have...
  13. J

    Timken or SKF 489 rear pinion bearing part number?

    if you need part numbers or differential rebuild parts go to Ratech Manufacturing website , they list Ford , GM , Chrysler , Dana etc. bearings , shims , crush sleeves/ solid spacers , wheel bearings, seals - i use it for reference all the time. part numbers are large bearing/race M804049 /...
  14. J

    741-8 and 3/4 pinion shaft

    if its a complete factory center section ,, if the pinion nut is 1-1/8 across the pinion is coarse ( 10 ) spline ,, if pinion nut is 1-1/4 across the pinion is fine ( 29 ) spline , you may also find a 1-5/16 pinion nut there if any work was done on the center section but again 29 spline ...
  15. J

    Had it with Richmond gears in my 67

    to clear up a few discussions ,, Richmond Gear exists in name only they were bought out by Motive Gear about 10 years ago so unless it is old stock lying around when you order a Richmond gear set you will get a Motive gear --- now Motive Gear sets are made in Italy (orange box - excellent gear...
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