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Diff Ratios 700

posted by  Neills740Turbo on  Fri Apr 25 00:48 CST 2008
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last visit: Tue Jun 29 01:10 CST 2010
[RELATED]

Hi all

Just want to get my head around diff ratios.

I would like to know what diff would be in a genuine 87 740 turbo with a m46?
I own a 87 740 turbo with a m46 which i converted from a AW70 i currently has a 3.73 diff.
on the weekend i drove a genuine 87 740 turbo with a m46 with an unknown diff ratio. and made my car feel like a granny scooter.
Both my car and the one i drove on the weekend and setup the same, both have turbo+, same cam, etc.
The only difference i know of is my box is the older cast iron. and the other alloy, and both have roughly the same k's

the person who owns the car said this is mostly likely due to my car being setup for auto and the diff ratio being wrong.
When driving my car the car has a habit of reving out very fast without much pull, whilst the other revs steadly and pull like a dog with a golf ball up its arse.

please could someone shed some light on the problem, could there be something else i am missing, clutch?? gearbox ratios?? etc.







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    a turn of phrase 700

    uid 18886's pic
    posted by  sdewolfe on  Fri Apr 25 05:26 CST 2008
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    last visit: Mon Jan 31 05:56 CST 2011
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    Neill,

    Others have already answered your question. Which is good because I haven't a clue. But...

    ...whilst the other revs steadly and pull like a dog with a golf ball up its arse.

    What part of the world do you call home? That phrase conjured an immediate and intense mental picture that is not soon to leave me. ROFLOL

    I grew up (in East Texas) hearing the phrase, "faster than a spotted-ass ape". The phrase never made sense to me. What is a spotted-ass ape? Exactly how fast is one of that species? Your description of applied torque makes much more sense.

    My dad used a phrase, "slicker than owl shit". He grew up just outside of Boston. When I was about 12 I asked him, "Dad, how slick is owl shit?" He laughed so hard he cried but he never answered my question. I still don't know how slick it is. ;-)
    --
    Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 52 year old fat man. ;-)








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    Diff Ratios 700

    posted by  someone claiming to be Al on  Fri Apr 25 05:08 CST 2008 [RELATED]

    I also converted mine to a manual but opted to install a 3.31 for better mileage. It came with a 3.90 rear end with the AW71.







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    Diff Ratios 700

    posted by  mcduck on  Fri Apr 25 04:07 CST 2008
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    last visit: Sun Sep 9 11:47 CST 2012
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    The '87 w/ M46 came with 3.54 gears; I put a 3.73 locker in mine. It pulls HARDER (as one would expect) with the 3.73s. BTW, gas mileage is identical.
    There should be no difference in gearbox ratios, unless you have a very early M46, in which case 1st. is higher than the later ones. "Reving out without much pull" sounds like a slipping main clutch or OD sprag clutch.








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    Diff Ratios 700

    posted by  Steve on  Fri Apr 25 01:12 CST 2008
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    last visit: Fri Oct 24 07:16 CST 2014
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    http://www.brickboard.com/FAQ/700-900/Driveline.htm#RearAxleRatioTable
    --
    See the 700/900 FAQ at the "select shortcut' button, upper right of your screen.







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