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Old 11-17-2006, 11:43 AM
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Turbo 350 Vs. Turbo 400

Which Is Better For A 79 Chevy Scottsdale Right Now It Has A 350 With 12bolt Rear 10 Front With 3:08 Gears Which Is Better

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Old 11-17-2006, 11:54 AM
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Neither one, put in a 4l60 because it has O.D. and it would improve your mileage and drivability.
Mark
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Old 11-17-2006, 01:46 PM
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i dont have that much money i got a 355sb and a turbo 350 right now
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Old 11-17-2006, 02:09 PM
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I would say stick with the 350 the 400 will rob more power from that small block than the 350. And a 350 is typically cheaper to overhaul. But as for the good sides of the 400, it is stronger. You find 400's behind big blocks a lot.
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Old 11-17-2006, 03:50 PM
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Quote:
Originally Posted by astroracer
Neither one, put in a 4l60 because it has O.D. and it would improve your mileage and drivability.
Mark
3.08's are way too high for OD
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Old 11-17-2006, 04:06 PM
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350 tranny

Neither one? If you dont have the money for a 400. 4l60,or 4l80 the 350 tranny will work fine . I would run 3.50 gears.
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Old 11-17-2006, 04:53 PM
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Quote:
Originally Posted by 79chevy4x4
Which Is Better For A 79 Chevy Scottsdale Right Now It Has A 350 With 12bolt Rear 10 Front With 3:08 Gears Which Is Better

I would ask which trans is in there now....

the t-350 and t-400 are NOT a simple "unbolt - bolt in" tranny swap..... lets say you have a t-350 and want a t-400.
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Old 11-17-2006, 05:14 PM
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The TH350 can be built strong enough for almost any application, and its usually cheaper.

Another factor is what transfer case you have . The spline count and length of the TH350 and TH400 trans to T-case shafts are different, while the spline count for a TH700R4 is the same as a TH350, but the length is different. This means you might have to change transfer cases and driveshafts if you change the transmission.

Do you really have a 3.08 rear end with a 4x4? My '75 K25 has stock 4.10 gears. Its tough for RPM on the highway, but works well otherwise.

Bruce
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Old 11-17-2006, 06:31 PM
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I agree with the 350 if you already have one in there. The 400 takes a lot of power to turn, but its ultimately stronger.

I say replace it with whatever you had before... keep it simple.
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Old 11-19-2006, 07:15 PM
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I would definatly stick with the T350. The T400 is overrated as a truck transmission. A T400 will take alot of power, but it is not as forgiving as a T350. Also a T350 is much stronger in reverse. When these trucks were new, the plow trucks with the T400 would always loose reverse before the T350 would have any problem. My 85 K10 has a 700R4 and 3.08 gears but my 75 GMC K25 has 4.10s and a SM465 muncie. I prefer the SM465 even with the low gears and no overdrive.
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Old 11-19-2006, 08:43 PM
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350 should be ok but I'd loose those high gears unless it's a hiway only rig.
I've got a beefed up turbo 400 in my '78 GMC and it's a great tranny.
It has an aftermarket heavy duty flexplate,heavy duty clutches and parts throught the tranny and a shift kit.
She pulls like freight train but a lot of that is due to a BB 454 and 4.56:1 gears.
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