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Thread: F series Diff . P51 box and likely sources for GT parts.

  1. #1
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default F series Diff . P51 box and likely sources for GT parts.

    According to the micro fiche an MS85R crown imported from 76/04 will have an F series 4.100 diff. MS85R-HGQ actually. Any comments?
    What size 6.7 or 7.5?
    LSD conversion a proposition?
    Also according to the Corona master parts list there were some 6.7 inch limited slip diffs in certain 73 onwards Corona's then in the GT they went only to the 7.5 inch version.
    Also according to the Australian Fiche provision was made for TA22GT and some RA40B with 18RG engines as the various parts specific are listed in the fiche and this was only done if the parts were available in Australia.
    I seem to remember I was able to get 18RG engine bits by reference to the RA series GT whereas any request for GT104 parts did not produce a full part number just the header prefixed by D (for domestic).
    I was not able to effect repairs on my F series diff in 1979 and could not get pinion bearings and I could not get the large bearings for the P51 gearbox which suffered the usual slop in 5th and became severely noisy and like the diff was thrown out.
    The parts fiche only shows the inside gearing for the P51 and W50 and does not make a distinction between the housing; so in the 73-08 to 75-11 built cars, the gearboxes will look identical from the outside and only a close inspection of the case or a peak inside at the type of syncros will reveal the truth. So don't dismiss W50's they might be P51's as many were imported in 1980 by API. I passed one up as I knew parts were unavailable and one can only speculate as to how many got thrown out. They were in my opinion a troublesome and lousy gearbox, notchy and hard to change up or down when cold, my wife hated it and often went into 3rd from 4th instead of 5th, and maybe this is why Toyota also passed them over.
    One can but imagine the condition of a gearbox discontinued in 1979, however if it is any consollation my new W50GT box was fitted in 1979 after I pulled out the P51 and at 100,000 km is quiet, notchy and runs well. The heavy duty Crown clutch and pressure plate is still in there and performing after 100,000 km also.
    Last edited by RT104GT; 23-09-2006 at 09:30 AM. Reason: Additional info
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  2. #2
    Yep they look great Carport Converter gianttomato's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    Not sure where the questions are but anyways here goes.

    Never got into the 80 series Crowns - they were absolute rust buckets and most were SEs - locally built and spartan pieces of shit - pretty sure they ran a Bog Warmer diff. If you can find an 80 series Super Saloon you might get an F series diff out of one of them but it'll be a single spinner.

    F series is 7.5".

    LSD from an MA61 FTW. You could use a Torsen from an IS200 with a spacer plate for the crown wheel, if that tickles your fancy. TRD do a centre for them too.

    Just use a W50. Only you will know the difference.

  3. #3
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    P51 -3.755 3.525 2.054 1.396 1 0.859 140hp
    W50 -4.039 3.287 2.043 1.394 1 0.853 90 hp
    W55 -4.091 3.566 2.056 1.384 1 0.850 190hp
    W56 -4.091 3.954 2.141 1.384 1 0.850 190hp
    W57 -3.768 3.285 1.894 1.275 1 0.861 190hp
    W58 -3.768 3.285 1.894 1.275 1 0.783 230 hp
    W59 -3.954 2.142 1.275 1.275 1 0.850 230hp
    Last edited by RT104GT; 23-09-2006 at 12:53 PM. Reason: How they rate
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  4. #4
    Yep they look great Carport Converter gianttomato's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    The ratings you have posted there are really only the maximum power engine they were found behind in standard guise from Toyota.

    The W50 ("Celica steel case" 5 speed) was the bogan 5 speed of choice to slot behind a 186/202 or 302. They lasted pretty well and, as shit as those engines are, they all make more than 90 hp and more torque than an 18R.
    Last edited by gianttomato; 23-09-2006 at 01:12 PM. Reason: ergh...godawful spelling

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    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    Yeah thought so V8 to celica 5 speed quite common.
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  6. #6
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    have a look here

    http://www.norbie.net/ToyotaAxle/Default.htm

    we have got nearly all non bog warmer ratios and other info there
    hello

  7. #7
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default P51 and F diff in 2000GT Nothing Special.

    Quote Originally Posted by brett_celicacoupe
    have a look here

    http://www.norbie.net/ToyotaAxle/Default.htm

    we have got nearly all non bog warmer ratios and other info there
    SURPRISED to find the 1973 2000GT Corona figures in this data base , thanks a lot..

    2000GT 1973

    F082 of body plate

    F series 7.5 inch crown Wheel
    4.111;1 ratio
    2 Pinion gears
    OPEN (NON-LSD).

    Maybe Celica GT's had LSD but the Corona GT that AMI brought in certainly did not if the plate is anything to go by.
    Last edited by RT104GT; 25-09-2006 at 07:00 AM. Reason: Added
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  8. #8
    Toymods Net Nazi Too Much Toyota river's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    Hi,

    Well maybe they thought the GT Corona was not as "sporty" as the Celica... seeing it's basically a medium 4-door sedan, compared to the 2-door Celica.. and as such they didn't see fit to put an LSD into the Corona?

    seeyuzz
    river
    The thinking man's clown and the drinking woman's sex symbol
    RA25GT - There is no substitute | 18R-G - Toyota's Dependable Masterpiece
    Toymods Car Club Treasurer, assistant Historic Plate Registrar & Forums Admin

  9. #9
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    Just back from wreckers.

    Found an MX60 E302 MX13 F312 and a Crown Royal saloon with same diff as I had F292 got it for free. Low km's,

    Also found an A40/T292 and a W50/T292 and a T18 T50/T302.
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  10. #10
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    F292
    Crownwheel: 7.5 inches
    Ratio: 4.100:1
    Pinions: 2
    LSD Type: open (non LSD)

    Less than 100,000
    FREE
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  11. #11
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Diffs at hamilton

    Hamilton Wreckers.

    E302 in an MX60 Cresida. Auto.
    Crownwheel: 7.1 inches
    Ratio: 3.727:1
    Pinions: 2
    LSD Type: open (non LSD)

    T292 in the 2 Celicas
    6.7 inch
    4.100:1
    2
    Open
    Ex RA40

    MX13 Mark 2 Corona has a
    Crownwheel: 7.5 inches
    Ratio: 3.909:1
    Pinions: 2
    LSD Type: open (non LSD)

    This is what I have in the GT now I think?

    There is a T18 with a 3TC and T50 running a t302 diff.
    Crownwheel: 6.7 inches
    Ratio: 3.727:1
    Pinions: 2
    LSD Type: open (non LSD)
    Last edited by RT104GT; 25-09-2006 at 08:54 AM. Reason: Added
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  12. #12
    Yep they look great Carport Converter gianttomato's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    Royal Saloon? Sure it wasn't a Super Saloon?

    MS105 was a pretty unusual car here in Aus - would have thought they were private imports.
    http://groups.msn.com/classicrown/19...to&PhotoID=391

  13. #13
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    Default Re: Diffs at hamilton

    Quote Originally Posted by RT104GT
    Hamilton Wreckers.

    MX13 Mark 2 Corona has a
    Crownwheel: 7.5 inches
    Ratio: 3.909:1
    Pinions: 2
    LSD Type: open (non LSD)

    might want to grab that one.... quite a few people on here are chasing them
    hello

  14. #14
    Normally Aspirated Domestic Engineer RT104GT's Avatar
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    I don't need the 3.909 as that is what is my my GT at moment. I am getting the 4.100 out tomorrow.
    If anyone wants the 3.909 I will take it out and store it here.

    PM me.
    1968 RT40S Corona 1600S series II (restore in progress)
    1973 RT104-MQFG 012604 Corona GT JDM (Owned since 1976 242000 km)
    1989 ST185-BLMVZ-0007199 Celica GT4 JDM (unmolested classic 95000 km)
    2012 ZN-6 86GT (shed find 5000 km in 6 years)

  15. #15
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    Default Re: F series Diff . P51 box and likely sources for GT parts.

    i think people will want the whole diff, ie drum to drum.

    the reason they are sort after is because they are 1410mm wide and F series.

    maybe you could put a add in the classifieds section to see if anyone would want it
    hello

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