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04-28-2008, 04:36 AM | #1 |
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Join Date: Jan 2006
Location: Warrington, PA
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wide ratio trans vs. close?
can anyone give me any insight on the difference between a wide ratio vs. close ratio trans as it pertains to our trucks. I hear a close ratio is better because there is less stress on the first gear. any input would be appreciated.....thanks
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69 C10 LWB GM 350 crate motor, 3.73 rearend |
04-28-2008, 04:59 AM | #2 |
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Location: Studio City, Calif.
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Re: wide ratio trans vs. close?
There's a current discission on this subject here;
http://67-72chevytrucks.com/vboard/s...d.php?t=289436 The only "close ratio" 4spd on our trucks that I am aware of is the NP 435 which still has a pretty low 1st at 4.56-1. You don't need it unless you're loaded pretty good. The other 4 spds,420,465,have even lower 1st gear which you would use for trailering. Stress on the gears is pretty much a non-issue since these are VERY stout units rated at (I think!) 500 ft.lbs.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 04-28-2008 at 05:01 AM. |
04-28-2008, 05:14 AM | #3 |
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Re: wide ratio trans vs. close?
I purchased a close ratio 3 speed saginaw...1st gear 2.54 2nd 1.50 and 3rd 1.0. I don't do any hauling and was wondering if this tranny will work well with 3.73 rearend.
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69 C10 LWB GM 350 crate motor, 3.73 rearend |
04-28-2008, 05:24 AM | #4 |
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Location: King City, Ontario, Canada
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Re: wide ratio trans vs. close?
if your not doing any pulling, tranny stress is really a on-issue. it only becomes an issue if you have a build big block in front or some crazy small block.
for the average, hot-rodded truck, almost any tranny wil do good with the right set of gears in the rear end. that being said, i think that a 3.73 gear would be just right.
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. |
04-28-2008, 05:25 AM | #5 |
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Location: Studio City, Calif.
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Re: wide ratio trans vs. close?
What's it out of? The two 3 spds available in a truck were 2.85,1.68,1 and the heavy duty;3.03,1.75,1.
Seems like yours would be OK,but make sure it is rated at least to what your torque is at.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
04-28-2008, 05:46 AM | #6 |
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Location: Warrington, PA
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Re: wide ratio trans vs. close?
It's a car tranny that I plan on matting behind a 260hp/350.
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69 C10 LWB GM 350 crate motor, 3.73 rearend |
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