ring and pinion replacement - Page 2
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Thread: ring and pinion replacement

  1. #21
    Member Dmcbrass's Avatar
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    Quote Originally Posted by P.J. Romano View Post
    I guess, choice of differential ratio is personal preference and how you use your car. Also, larger displacement engine (I run 2.5) provides plenty of power and torque for brisk acceleration even with standard differential. I mostly drive long road trips, so when I added Quaife LSD, I made special effort to keep standard 3.44 diff ratio. Two days ago I drove my GT eleven hours from Pennsylvania. I certainly enjoyed keeping 75 mph at some 2600 rpm. But for smaller engine short ratio could certainly be fun when jumping from traffic light to traffic light or for the track event.
    How are you getting 75mph at 2600 RPM?

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  3. #22
    1000 Post Club Vincent's Avatar
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    Quote Originally Posted by Dmcbrass View Post
    How are you getting 75mph at 2600 RPM?
    Easily. He just drives 75 mph..lol
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    MikeNotigan and slracer like this.

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    Taller than stock rear tires and a T5 tranny with a taller fifth ?

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    Quote Originally Posted by Commodåren View Post
    Taller than stock rear tires and a T5 tranny with a taller fifth ?
    Pj runs a getrag

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    Taller tires then, with the stock 165 13 size the speed would be 66,16MPH, or 106,45km/h in metric.
    (0,5992m x 2600RPM) : (0,804 x 3,44) x 0,189 = 106,45km/h : 1,609 = 66,16MPH.
    Last edited by Commodåren; 5 Days Ago at 01:56 PM. Reason: Corrected error in the formula.

  8. #26
    Opeler opelmeister's Avatar
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    Don't know if I can solve your problem but I'm down to my last two rears. I'm in North Jersey about 30 miles West of NYC and have had a number of MD. Opelers come up to get larger parts such as heads, 4 speeds, seats, etc. Contact me if you are interested and I've sold others for about $150.

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    Opeler 72Rallye's Avatar
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    Quote Originally Posted by slracer View Post
    I thought if you jacked up 1 rear wheel and turned it 1 revolution the driveshsft would turn 3.67 times (making it easier to compare, 6 revolutions of the tire would be 22 at the drive shaft. The 3.44 rear would make slightly less than 21 turns so it should be easy to determine. Of course, if you have a limited slip differential (or locked!), it won't work IIRC.

    The difference between .81 and .804 in 5th would be about .04 at the rear axle so, not a 3.44.

    Doug
    If you lock one wheel, the other wheel will spin twice as fast compared to when both wheels are spinning. Therefore, when jacking up one wheel and spinning it one turn the driveshaft will turn 3.67/2 =1.83 turns.

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    Quote Originally Posted by GTeglman View Post
    Gentlemen, thank you all for your contribution, whether I should go 3.89 or not

    @mgwinner, sorry to have "hacked" your post, and I excuse for the slight detour it have taken from you original question. Don't mean any harm.

    Cheers
    no problem, I did finally find the isuzu information but new ring and pinion gears for a mid 1980's Isuzu is as extinct as the Opel.

  11. #29
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    Quote Originally Posted by 72Rallye View Post
    If you lock one wheel, the other wheel will spin twice as fast compared to when both wheels are spinning. Therefore, when jacking up one wheel and spinning it one turn the driveshaft will turn 3.67/2 =1.83 turns.
    Thanks, I knew something was missing!

    Still, enough to tell the difference between a 3.44 and 3.67 after 6 turns of the wheel.

    Doug

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