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Old 12-18-2003, 10:27 PM
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Some sound tranny advice please!

Just lookin for some good sound advice from someone in the know. OK I've got my project sport truck ready to go togeather but i need tranny advice. Its a 76 GMC short bed 1/2 ton pickup, a 355sbc, with s/r torquer's, a Lunati cam comprable to the comp, 268H. EPS Edelbrock performer manifold,a 1405 carb. The truck will be a daily driven vehicle with no intention of pulling or hauling anything. It also has 3.40 gear's and will be on P275R60-15's .28in. rubber's. I was wondering if a bone stock 700r4 from a 1989 GMC minivan, with a 4.3 v6, be worth the time or effert to use in my truck, the tranny shift's real nice an donot believe it's the original tranny. Or should i purchase a (Bowtieoverdrive's) stage 1 or stage 2, 700r4 tranny's or mabee a 2004R tranny. Was also thinkin about a beefed up TH350 since these truck's do come TH350's.(Just lookin for the best bang for my buck)

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Old 12-18-2003, 10:37 PM
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id stick with a 350 but if your spending money get a 400 alot stronger than a 700r4
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Old 12-18-2003, 10:42 PM
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Thanx (badknuckles) for your reply. Now you say go with a 350, Now witch would you go with ( TCI, B@M, or a Summit Brand )
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Old 12-18-2003, 10:52 PM
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ive had bad experiences with b&m trans's id get a tci never heard anything bad about em
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Old 12-18-2003, 11:22 PM
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Yea point well taken >< A buddy of mine has a 1/2 tone pickup with a 305 and a 700r4 in it and it is real hard on gass, I think i'll take your advice about the TH350
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Old 12-19-2003, 02:13 PM
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The 700-r4 is better than the turbo 350 in almost everyway if the truck is gonna regularly be street driven with 3.40 gears its definetly the best choice. It is more expencive than the turbo 350 but the fuel economy will be far better with the 700 so it will work out in the end. The 700 you mentioned from the van will be one of the better one the pre 87 ones were much weaker. If I was you'd I'd swap it in and drive it and if it goes evenually rebuild it and beef it up a little.
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Old 12-19-2003, 06:43 PM
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almost every way. almost .
th350 is alot stronger than a 700r4 you will get better mileage with a 700r but id take reliability over 2mpg anyday
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Old 12-19-2003, 07:43 PM
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Thanx for all of your replies fellow gearhead's) Now this 700r4 tranny that's in my 1989 GMC minivan shift's real nice behind the 4.3 V6 wich it's self does have well over 100,000 mile's on it, but i believe the tranny has been redone before, but the ? is is it safe to put behind a nice 355sbc. A stage 2 700r4 from (Bowtieoverdrive) is a $1020.00 by it's self not includeing the converter, and all the other fixin's to hook it up. It would be nice if it would last awile if i baby it. (Please Advise)
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Old 12-19-2003, 07:48 PM
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i have a camaro with a th350 never been rebuilt. now i have a beefed up 355 in it no problems at all and its 25 years old.
my brother has a 87 ta with a 700r4 he cant keep a trans in the thing. he is so sick of changing trans's he is just making it a manual
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Old 12-19-2003, 07:53 PM
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From what i understand is if the (TV) cable isnt adjusted properly the 700r4 will not last long. (Thats the part that im afraid of)
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Old 12-19-2003, 08:01 PM
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if you have a th350 it's a great trans id stay with it
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Old 12-19-2003, 09:01 PM
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Coming from a rock crawling background, I've seen a lot of tranny failure, most due to heat. The 700r4 is always a favorite due to the low 1st gear and overdrive. They are not generally good however under high stress though, especially when placed between a lot of traction and a stout engine under a heavy vehicle. Given your trucks street status, lighter weight and smaller traction footprint (unless your running hoosier slicks), the 700r4 might work out just fine. The 2004r is harder to come by but a stout alternative - unfortunately not a 4wd case so I have little to add there in comparison. The th400 is stronger than a th350 but absorbes a bit more power. The th400 also has a taller 1st gear so it will be a little slower off the line. Given the choice between the th400 and the th350 in a street truck, I'd beef the internals in a th350 and run that but the 700r4 is very compelling with and even shorter 1st gear than the th350 and the overdrive, allowing you to run a steeper rear end diff.
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Old 12-19-2003, 11:38 PM
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With a 28in tall tire and 3.40 gear's and the 1to1 ratio that a TH350 has, how many rpm's will my motor be crankin compaired to the 700r4?
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Old 12-20-2003, 09:31 AM
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With a 28 inch tire and 3.40 gear ratio at 55 MPH:
The 350 OR 400 transmission at 1:1 drive gear your RPM's are 2245.
The 4L80 transmission at .75:1 overdrive gear your RPM's are 1684.
The 700R4 transmission at .70:1 overdrive gear your RPM's are 1572.
The 2004R transmision at .67:1 overdrive gear your RPM's are 1504.

I would say, that unless you want a gear change to stay with either a 350 or 400 transmission to keep your RPM's in the engines power band.
You could also go with a slightly shorter tire and the overdrive to give you the best possible combination of both power and economy.
I found this information over at:
Gear Ratio Calculator
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Old 12-20-2003, 09:54 AM
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(XL-LENT) info there M&M CUSTOM) MUCH THANX, Yea i think that i'll gear toward's a TH350 that's stout enough to churp the tire's. I really think the reason a lot of car show hopper's like the 700r4 tranny is because it help's out on there sometime's long trip's from home to car show and back home with gas milage. But i myself dont go anywhare anyway,also if your just buss'in thru town to the store it's not recamended to have a 700r4 in the overdrive under 40 or 50 mph. Im just not sure if i should get that TH350 that Summit has in there catalog, or get a (TCI) (B@M) or trust a local tranny shop with the TH350 that i have on my basement floor.
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