Axle identification ??
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  1. #1
    Official RnS Addict Slackspanner's Avatar
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    Axle identification ??

    Can anyone help ..I have been told I have a pontiac axle in my truck !! I need to identify it and swop the ring and pinion to drop the revs and make it a better motorway drive and help the mpg.. I recken its a 3.45 axle ratio and it feels like it has a locker/lsd in it..i run a 350 350 set up and 1st gear shifts about 10mph and it runs about 3000rpm at around 60 mph so we got to do something any help will be welcome..rear cover has 10 bolts, 10" diameter, casting numbers on bae of diff casing 28041414 GM04 050 ...thanks






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  3. #2
    Muffin tester.
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    From the lugs cast into the 5 o'clock and 7 o'clock positions I would suggest its a 8.5 inch GM "corporate" axle.

    Do a Google search, loads of info out there on them. I have one in my 67 Camaro. Also have a excellent condition Posi unit and 2.56:1 ratio crown wheel and pinion for one here that would be available if its suitable, Take the back cover off yours and count the teeth on the ring and pinion or do the whole mark the driveshaft/count wheel revolutions thing to tell you what ratio you have.

    Parts are very available for this rear end. I have a 2.56 gear here in a box, but you will have to change your differential/Posi carrier if you have any of the gear ratios from 2.73:1 to 5.13:1 fitted at the moment because the carriers are different, series 2 and 3 I think but I cant remember which one is which !
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  4. #3
    Muffin tester.
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    With a 2.56:1 ratio this is the graph for a TH350 assuming its standard ratios.

    MPH 10 20 30 40 50 60 70 80 90 100
    1 Ratio = 2.52 775 775 1549 2324 3099 3873 4648 5423
    2 Ratio = 1.52 467 467 935 1402 1869 2336 2804 3271 3738 4205
    3 Ratio = 1.10 338 338 676 1014 1353 1691 2029 2367 2705 3043

    This ratio is what I removed from my Camaro with the same axle, I put a 3.08:1 in it, the graph for that is:


    10 20 30 40 50 60 70 80 90 100
    1 Ratio = 2.52 932 932 1864 2796 3728 4660 5592 6524
    2 Ratio = 1.52 562 562 1124 1687 2249 2811 3373 3935 4497 5060
    3 Ratio = 1.10 407 407 814 1221 1627 2034 2441 2848 3255 3662
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  6. #4
    Official RnS Addict Slackspanner's Avatar
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    Cheers Paul
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