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Old 03-05-2005, 07:45 AM
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700R4 or 350TH

I have a 53 Chevy pick-up and i will be putting a sbc 350 4bolt motor in with a 10 bolt posi rearend(3:08 gears).I was wondering what is the advantage of one tranny over the other one.The 350TH is a 3 speed and the 700R4 has over drive but is one stronger or more reliable???


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Old 03-05-2005, 08:19 AM
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Put a 700r4 , better on the road, cheaper on the gas, and a good 700r4 is as strong as T350...

take look here http://www.transmissioncenter.net/700megaraptor.htm

i'm currently looking to put an overdrive trans in my car... I will probably go whit a 4L80 since my engine will be near/more than 1000HP.


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Originally Posted by greywulf
I have a 53 Chevy pick-up and i will be putting a sbc 350 4bolt motor in with a 10 bolt posi rearend(3:08 gears).I was wondering what is the advantage of one tranny over the other one.The 350TH is a 3 speed and the 700R4 has over drive but is one stronger or more reliable???


Thx
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Old 03-05-2005, 10:39 AM
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With only 3.08 gears you might not like the overdrive of the TH-700R4.
I have 3.73 gears in my Malibu with a TH-700R4 transmission and at 55 it lets the engine run around 2000 rpm's with the 26 inch tires I have on it, it also has quite a bit of get up and go power for the stock 267 engine.

You could play around with tire size and get the same effect out of the TH-350 at highway, but you would lack the 3.06 first gear go power as compared to the 2.52 first gear of the TH-350.
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Old 03-05-2005, 07:57 PM
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M&M what rearend gears are better with a 700R4 tranny??
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Old 03-06-2005, 11:19 PM
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Greywulf, would be better off with 3:55 to 3:73 gears with the 700r4 depending on tire size. This would be for general cruisin, town and highway.
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Old 03-07-2005, 12:01 AM
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3.059 first gear with a 3.73 rear might be a bit tough to hook up....
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Old 03-07-2005, 05:37 AM
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Quote:
Originally Posted by M&M CUSTOM
With only 3.08 gears you might not like the overdrive of the TH-700R4.
I have 3.73 gears in my Malibu with a TH-700R4 transmission and at 55 it lets the engine run around 2000 rpm's with the 26 inch tires I have on it, it also has quite a bit of get up and go power for the stock 267 engine.

You could play around with tire size and get the same effect out of the TH-350 at highway, but you would lack the 3.06 first gear go power as compared to the 2.52 first gear of the TH-350.
I'll muddy the waters here a bit....... A friend of mine had a '63 bel Air powered by a 305 with a Performer cam, 4 bbl. and dual exhaust backed up with a 3.08 R&P and a tweaked 200-4R OD which has 33% OD vs. 30% for the 700R4 and a 2.74 (IIRC) 1st gear. It worked "ok" with the 3.08's but really needed a 3.36 or lower. He determined he needed at least a 3.55 to optimize the combo. With a few select mods the 200-4R makes a killer tranny behind most small blocks and even moderate big blocks. The only real "bad" thing about the 700R4 for most street performance application is that with the optimum FDR for the OD the 3.06 1st gear is just too darn low, although it IS fun the 2.74 in the 200-4R is a bit more "reasonable". Most people are convinced they have to have the 700R4, I remember when we all thought the TH350 was a POS and the only tranny to run was the TH400 . Either OD works better with 3.55 or lower gears though.
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Old 03-07-2005, 11:15 AM
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greywulf would be better of with a TH-700R4 than the TH-350 as it doesn't sound like he will need to be racing it. A tire size you are running or intend on running will better help determine your needed gear ratio.

My Malibu has the 700R4 with 3.73 gears and 26 inch tall tires, 2000 rpm's at 55mph.
My Suburban has 3.42 gears and 29 inch tall tires, I am not sure of the rpm's at 55 but it could use more gear for my intended useage of pulling a car hauler trailer starting this summer. I plan on using a 32 inch tire (235/85/16) and 4.10 gears for the extra hill climbing ability.

I eventually plan on swapping the automatic transmissions out of BOTH of these vehicles, the Malibu will get a 4 speed very similarly geared to the TH-700R4, but the Suburban will get a granny geared truck 4 speed, and when that swap takes place the tires will remain at the 32 inch size but the gears will go down to a 3.73 set. I have several axles here in both of those ratios so an axle swap is simpler than a gear swap in my case.
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Old 03-07-2005, 11:23 AM
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I'm running a 200R4, 3.54 gears and 27" tires on my '53 Chevy pickup. Hard to beat these OD trannys for all-round performance and economy.
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Old 03-07-2005, 08:17 PM
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Thx all for your advise...so I guess if I want to stay with TH350,3:08 gears will be fine....If I want to use a 700R4.its better I use 3:55 of 3:73 gears.I not sure what tire size I'am going with yet,I have some temp.rims and tires from a 80 camaro P215/70R14 that I'am going to use till I can see what size of rims I can get away with.
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