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T56 behind a 461 Pontiac in a 71 Lemans

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  • pontiacpower
    started a topic T56 behind a 461 Pontiac in a 71 Lemans

    T56 behind a 461 Pontiac in a 71 Lemans

    so circumstance would have it that a freshly rebuilt t56 has fallen out of the sky into my lap. It was rebuilt for a 454 and it has an LS input shaft. Everything fresh though and I have a build sheet to prove it.

    Anywho, what will I be needing to swap from a t350 to the tremec. I have a bell and adapter for the 454 because this is an srt10 truck trans.

    Shifter
    Hack the trans tunnel
    special speedo cable for electric to mechanical
    driveshaft

    pedals
    Rods
    linkage

    am I on the right track here?

  • pontiacpower
    replied
    Well as far as tires go..... mine are probably 28 inches tall not sure how wide.but they are street tires so I donít I could destroy a rear end that lived behind a lot of drag cars over the years

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  • pontiacpower
    replied
    Well as far as tires go..... mine are probably 28 inches tall not sure how wide.but they are street tires so I donít I could destroy a rear end that lived behind a lot of drag cars over the years

    Leave a comment:


  • silver_bullet
    replied
    It all depends on the condition it is in now, and how hard you shock load it once you start driving it with the new combination... remember that the axle housings are pressed into the pumpkin...I have seen them slip and twist on a hard launch, some people weld those joints to prevent this from occurring... also as mentioned before. sticky tires would not be your friend in this application...

    Leave a comment:


  • pontiacpower
    replied
    Copy that. I just hope this 10 bolt will hold up in a straight line you know.

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  • silver_bullet
    replied
    I run through ads for Pontiac stuff daily and Iím more and more tempted every day. Iíll give the guy a call. But when you ďfreshenĒ a rear end what does that mean? Change fluid and gasket? In the ad he said both wheels spin together but it could use a freshen up
    In most cases, I would consider freshening up to include the following: visual inspection, new axle bearings and seals, check gear lash, gasket and fluid (don't forget the posi additive if so equipped/required). Make sure to look for signs of axle and housing twist.

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  • pontiacpower
    replied
    I run through ads for Pontiac stuff daily and Iím more and more tempted every day. Iíll give the guy a call. But when you ďfreshenĒ a rear end what does that mean? Change fluid and gasket? In the ad he said both wheels spin together but it could use a freshen up

    Leave a comment:


  • AndyB
    replied
    ^ Super true.

    If you run smallish tires, you'll have a very hard time getting enough shock load to break the differential. Not to say that it isn't possible, as ten minutes with a 17 year old driver could demonstrate, but it's much more difficult.

    Leave a comment:


  • Dan Barlow
    replied
    If itís thumpinn455 (Todd I think)

    Yep . My job here is though .
    For $100 I'd put that 10 bolt posi in there and then save for a new 9 inch as per Loren . Then again , I ran a 9 bolt Aussy in my and my oldest sons 3rd gen F bodies and never had any problems . Just stay away from slicks VHT and drag strips . Sometimes lack of traction can be your friend . We were running 255.50.17s
    Last edited by Dan Barlow; March 26th, 2019, 09:10 PM.

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  • Loren
    replied
    It's not easy being me.

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  • SuperBuickGuy
    replied

    Different than Chevy then, where the '68 Chevelle is where they got wide. See whatcha get from a Chevy/Ford/Mopar guy?
    if you weren't so divided in your loyalty ....

    Leave a comment:


  • pontiacpower
    replied
    Sounding like 9 inch might be the way to go after all..... I do remember pulling the gears that change the ratio and I knew nothing about rear ends(still know nothing about rear ends) and it took me less than 20 minutes to get them out with an old timer telling me how to do it.

    Leave a comment:


  • Loren
    replied

    but the 67 rear isn't the narrow one... 64/65 only.
    Different than Chevy then, where the '68 Chevelle is where they got wide. See whatcha get from a Chevy/Ford/Mopar guy?

    Leave a comment:


  • pontiacpower
    replied
    Sbg what can you say about them bop 10 bolts. Iíll be 600 hp/tq at the crank for sure but I wonít be doing crazy stuff like autocross. Whatís it take to make one of these things run that kind of power

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  • SuperBuickGuy
    replied
    You've mentioned lots of HP someday, I think you'd maybe want to end up with Ford 9" then eventually... Nothing bolts in but you can buy them modified to do so such as:

    [URL]

    But for now, $100 to get a narrow-style axle with your present brakes and driveshaft possibly being a direct swap, that would get your tires out of your fenders, be cheap, and get you on the road then just beat it up 'til it breaks...if it does. Maybe you take it easy and it lasts forever? In any event, SBG who is already here can tell you more about B-O-P rears than any of of the rest of us Chevy-Ford-Mopar people.
    but the 67 rear isn't the narrow one... 64/65 only.

    while I may bemoan the non-use of the BOP rear, I'd never spend the money on one - too many limitations - if anything I'd put a 12 bolt for period correct and a 9" or 8.8 for best strength/value.... and for the record, I learned about BOP rears with my 70 Skylark and replaced it with a 12 bolt.....

    Leave a comment:

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