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Old 11-18-2004, 05:21 PM
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help choosing tranny

sorry if this thread has been made over and over again, but i really need some help. recently my th 350 burnt out its forward gear clutches. This gives me the perfect opportunity to choose a new tranny. Im considering many options, but first let me tell you about the car its a 64 nova with a 350 making over 300 hp but not quite 400 it has a stock rearend (by the way does anyone know the gear ratio for that year) 235/60-15 rear tires here are my options
1. rebuild the th350 myself and gain a lot of knowledge
2. pay 650 for "better then stock" and have the tranny rebuilt (includes mild shift kit, and new stall converter)
3. buy a th 400 and throw it in
4. spend the money and convert to a 4-speed
5. anything else you guys suggest
any help right now would be great im in desperate need! right now i went back to the old powerglide just to get me around town, but i don't want that to be permanent.

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Old 11-18-2004, 05:41 PM
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I would do #2, cus if you do #4, you will blow the rear end in no time.
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Old 11-18-2004, 09:03 PM
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I would also say to go with # 2. A th350 is more than enough for less than 400 hp. It weighs less than the th400 and takes less power to turn, and has a slightly lower first gear.
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Old 11-18-2004, 09:11 PM
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Get a good used TH350 to throw in it and get a good core to rebuild. That way you have something in the car to be able to drive and can take your time rebuilding the core. Now you'll be able to abuse that sucker and always have a fresh one on the shelf ready to go. You should do the same with motors.
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Old 11-18-2004, 09:47 PM
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I agree get a good build done on the th350 there is little point in upgrading to a 400 as a 350 will do the job just fine.
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Old 11-18-2004, 11:06 PM
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Why would the 4speed blow the rear? They usually have a slightly lower 1st than the th-350 but were the rears really that weak?
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Old 11-19-2004, 02:03 AM
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do you guys think $650 is a good price for total rebuild using "better then stock" parts ( not sure what the guy actually means by that) including the shift kit a stall converter (not sure what rpm range)? or should i shop around a little more?
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Old 11-19-2004, 05:53 AM
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Quote:
Originally posted by Siggy_Freud
Why would the 4speed blow the rear? They usually have a slightly lower 1st than the th-350 but were the rears really that weak?
Have you ever "dumped the clutch" on anything that has more power than the vehicle was initially designed to ever have?

A manual transmission will allow more shock from the engine and clutch to the rear axle without having the "cushioning" effect of the automatic transmissions inner workings.

A lower gear will give even more of a shock to the rest of the drivetrain.

For example, have you ever seen very healthily built rock climbing vehicles? With their low transmission first gear of up to 7.5 to 1, a low transfer case ratio of up to 4 to 1, and an axle gear ratio of 4.10 to 1, whatever the torque output of the engine is in this possible application you just multiplied it by 123 to one.
That would be engine torque, times 7.5, times 4, times 4.1.

Your particular case would equate to 300 pounds of torque times 2.48 of the TH-350's first gear, for 744 pounds of torque going into the axle, now, multiply that by the gear ratio. More or less.
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Old 11-20-2004, 06:41 AM
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Another Option

Just something else you may want to
consider - a good overdrive automatic.

The 2004R (like from the Buick turbo
GNs) can be easily beefed just like
the more common 700R4 is, in fact
they share a number of the same
components, and is a direct bolt in
for a 350 - driveshaft length, mounts,
bellhousing, shifter connection, etc.

It has a better gear ratio spread than
a 7004R because first isn't such a wide
spread from second, etc. The 2004R
has about a 2.7+ first, which is a little
deeper than a 350 but not as deep
as a 700R4. So it's like both having
a step deeper rear gears while in
low and second, and then the OD
gives you MUCH better highway
economy and saves a lot of rpm
related wear on the engine.

http://www.ptsxtreme.com/index.asp
http://www.tciauto.com/gm/gm_2004r.htm
http://www.2004r.com/faq/gearrat.htm

Those places, as well as some other
major aftermarket vendors, have good
info and parts availability. The first
one in the list seems to be very knowledgeable - after all they
work on the Buick turbo cars and if
they get the 2004R to hold up to some
of them, they've got to know what
they're doing!

I've got an 81 Vette with a 350 that
I'm DEFINITELY going to do a 2004R
for, both for the 1st/2nd gear ratios
and for highway cruising.
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