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Old 11-03-2015, 01:14 PM   #1
cerial
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450 470 series drivetrain

What transmission was used with the 450/470 series trucks? What engine was used in these trucks?

I am trying to get a definite max torque number for this 5531 Watson. I am thinking a 302 with a 4 speed Muncie or Clark 5 speed. I am guessing a number between 1800 and 2000 lbs input torque. But, that is based upon a 302 engine and vague at this point.

Thanks for any help.
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1991 s10 future project truck
1987 V10 backup daily/junk truck
1985 K20 Winter beater
1991 R30(squarebody) c/c flatbed towrig
1994 s10 80"wb custom build
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Old 12-05-2015, 11:16 AM   #2
eagleuh1
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Re: 450 470 series drivetrain

My 50 GMC 450 fire truck has 270 "H" head engine with Clark Direct drive final 5 speed. Don't know offhand what gears the rearend is, but it's single speed. Put a 2 barrel GM TBI with 2 barrel military intake and dual fentons. Top speed 60 miles per hour now. Too fast really, bounces around a lot.
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Old 12-05-2015, 11:17 AM   #3
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Re: 450 470 series drivetrain

It's a 453 chassis.
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