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Old 07-21-2011, 10:35 PM   #1
BMERDOC
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Sticks and Clutches

So my truck has the three speed that was originally a three on the tree and now its on the floor and it came with a straight 6 originally and now has a 78 250. Although I have yet to decipher my 12 bolt (what gearing could this 67 have?) what is the easiest swap? What would you go with? I've heard of the S10 5 speed and Im not against a clutch. I guess the S10 is a hydraulic system which has added expense. Again, what is the easiest/best swap in your opinion?
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Old 07-21-2011, 11:36 PM   #2
ETsC10
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Re: Sticks and Clutches

BMERDOC, I assume you have a saganaw?
I'm sure you will evenually get some answers on your origional
question here.

Me...don't know that.

My last DD had a three-on-the-tree behind a V-8.
Way more performance than my T400!!!!

As far as your rear end gears, here is a post by 1969k10stepside from a few years back that might help you:

"Pull the cover off the differential, there will be numbers on the ring gear. The last 4 numbers
will be something like 41,11 etc, etc.
Then use them with the numbers below, or just simply divide and you will know the ratio. There is other ways
to check but the only for sure way to know is to check on the ring gear. There use to be tags on one of the
bolts but they are mostly always gone by now and who knows if the gears hadn't been swapped before so pulling
the cover and checking is the certain way to know. Also you change the oil when doing this
since it probably needs changed anyway...

Ratio 2.56:1 - Tooth Combination 41,16
Ratio 2.73:1 - Tooth Combination 41,15
Ratio 3.07:1 - Tooth Combination 43,14
Ratio 3.08:1 - Tooth Combination 40,13
Ratio 3.08:1 - Tooth Combination 37,12
Ratio 3.31:1 - Tooth Combination 43,13
Ratio 3.36:1 - Tooth Combination 37,11
Ratio 3.42:1 - Tooth Combination 41,12
Ratio 3.55:1 - Tooth Combination 39,11
Ratio 3.73:1 - Tooth Combination 41,11
Ratio 4.10:1 - Tooth Combination 41,10
Ratio 4.11:1 - Tooth Combination 37,9
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Old 07-21-2011, 11:45 PM   #3
crazy longhorn
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Re: Sticks and Clutches

More than likely, that I6 truck was equipped with a 3.73 gear. I cant help on the s-dime 5spd swap....if you said Muncie, or Borg warner, or Richmond, I have done that crazyL
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Old 07-21-2011, 11:46 PM   #4
BMERDOC
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Re: Sticks and Clutches

That Biotch is caked it grease. I dont know if its a Saginaw or a whirlpool. It'll come out soon and be cleaned. If it has numbers on it I'll find them and given a day or two I'll tell you everything you ever wanted to know about it. Thanks for your info!
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Old 07-21-2011, 11:51 PM   #5
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Re: Sticks and Clutches

ok I'll give you a shove...200 or 700r4? The units seem to be cheaper these days but the pkg can get expensive. Do I "dump" the clutch or is there a nice alternative?
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Old 07-22-2011, 10:03 AM   #6
geezer#99
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Re: Sticks and Clutches

Here's a bunch of info on T5 swaps.
http://67-72chevytrucks.com/vboard/s...d.php?t=438224
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