The good/the bad/the ugly....need transmission recommendations - The 1947 - Present Chevrolet & GMC Truck Message Board Network

space · 11-23-2007, 09:17 AM

The good: Finished getting the motor in yesterday. Runs like a scalded dog.
The bad: The tranny started slipping after about 10 miles.
The ugly: Tranny is shot after 20 miles.

This is just my luck. Four months to get this beast built and the tranny goes after 20 miles. 20 miles?!? I didn't even have time to get on it good.

I knew this would happen but figured it'd at least last a couple of months. Anyways, I need a new tranny, one that can handle ~500 hp right now, and potentially more in case I ever decide to spray it. I can get this one http://www.rosslertrans.com/Th350%20...OMPETITION.htm that will handle it, but the price is up there (~1500 after everything is said and done). TCI is about 1700, but I don't think it's as good as the Rossler. Any other recommendations out there?

Luvlegs · 11-23-2007, 09:21 AM

I've been building a 454 to make 500 at the crank (numbers wise anyhow) and was told/so I bought, a 400 tranny. I figure picking up a cheap one and then spending 5-800 getting it rebuilt is the way to go. By the time I get to it, it'll probably cost a grand but I at least have the tranny!

**FRENCHBLUE72** · 11-23-2007, 10:35 AM

I went with a th400 had it rebuilt by a local shop for more power out handling hopefully it will work..

space · 11-23-2007, 10:49 AM

You know that brings up another question which I'm sure has been asked a million times: should I stick with the 350 or ?

**WorkinLonghorn** · 11-23-2007, 10:55 AM

If you decide to get this one make sure they replace the steels (in the clutch packs).
Personally I'd feel much better with a 400.

cdowns · 11-23-2007, 11:13 AM

sometimes racing trannies arent very good for drivers and dont last many miles

space · 11-23-2007, 11:24 AM

Anyone ever used RPM tranny's?

gangforward · 11-23-2007, 11:54 AM

Simple answer - with that much power - T400 is the way to go. Mine was built with all the good stuff - and is good for up to 800 hp - get a good converter and replace the Ujoints while you've got the shaft out and the last piece you'll have to replace is the rear end...

Good Luck

mnunn454 · 11-23-2007, 05:57 PM

Quote:

Originally Posted by space_cowboy

You know that brings up another question which I'm sure has been asked a million times: should I stick with the 350 or ?

TH400's certainly are beefier than the TH350, but they also get a little poorer gas mileage. But unless this is your daily driver, MPG isn't a big concern.

Either tranny can be built to handle your HP/TQ requirements, but the TH400 will have a little more safety factor built in should you decide to spray it later. The TH400 has another advantage, and that's a larger output spline and U-joint that's less likely to fail on you.

However, a friend of mine has a TH350 behind a potent 396/402 and it's holding up just fine.

I'd say, if you can buy a really beefy TH400 for less than $1000, then go for it. If not, find a good TH400 core for $100 or so and put $600 to $800 of parts in it yourself.

Monster and Art Carr are some others who I hear build beefy transmissions but I've never used either.

11-23-2007, 09:17 AM	#1
space Registered User Join Date: Aug 2007 Location: Benson-ish, NC Posts: 325	The good/the bad/the ugly....need transmission recommendations The good: Finished getting the motor in yesterday. Runs like a scalded dog. The bad: The tranny started slipping after about 10 miles. The ugly: Tranny is shot after 20 miles. This is just my luck. Four months to get this beast built and the tranny goes after 20 miles. 20 miles?!? I didn't even have time to get on it good. I knew this would happen but figured it'd at least last a couple of months. Anyways, I need a new tranny, one that can handle ~500 hp right now, and potentially more in case I ever decide to spray it. I can get this one http://www.rosslertrans.com/Th350%20...OMPETITION.htm that will handle it, but the price is up there (~1500 after everything is said and done). TCI is about 1700, but I don't think it's as good as the Rossler. Any other recommendations out there?

11-23-2007, 09:21 AM	#2
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: The good/the bad/the ugly....need transmission recommendations I've been building a 454 to make 500 at the crank (numbers wise anyhow) and was told/so I bought, a 400 tranny. I figure picking up a cheap one and then spending 5-800 getting it rebuilt is the way to go. By the time I get to it, it'll probably cost a grand but I at least have the tranny! __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew!

11-23-2007, 10:35 AM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Re: The good/the bad/the ugly....need transmission recommendations I went with a th400 had it rebuilt by a local shop for more power out handling hopefully it will work.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

11-23-2007, 10:49 AM	#4
space Registered User Join Date: Aug 2007 Location: Benson-ish, NC Posts: 325	Re: The good/the bad/the ugly....need transmission recommendations You know that brings up another question which I'm sure has been asked a million times: should I stick with the 350 or ?

11-23-2007, 10:55 AM	#5
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: The good/the bad/the ugly....need transmission recommendations If you decide to get this one make sure they replace the steels (in the clutch packs). Personally I'd feel much better with a 400. __________________ '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, 2nd owner, Work-Truck supreme. Best $300 I ever spent. Last edited by WorkinLonghorn; 11-23-2007 at 10:59 AM.

11-23-2007, 11:13 AM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: The good/the bad/the ugly....need transmission recommendations sometimes racing trannies arent very good for drivers and dont last many miles __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-23-2007, 11:24 AM	#7
space Registered User Join Date: Aug 2007 Location: Benson-ish, NC Posts: 325	Re: The good/the bad/the ugly....need transmission recommendations Anyone ever used RPM tranny's?

11-23-2007, 11:54 AM	#8
gangforward Hootis is as Hootis does... Join Date: Nov 2002 Location: Southern Georgia Posts: 500	Re: The good/the bad/the ugly....need transmission recommendations Simple answer - with that much power - T400 is the way to go. Mine was built with all the good stuff - and is good for up to 800 hp - get a good converter and replace the Ujoints while you've got the shaft out and the last piece you'll have to replace is the rear end... Good Luck __________________ 67 C10 LWB Fleet, 383, TH400, PS, 4BL-Holley, Headers & 3" Exhaust, 3" drop front, 4" rear springs, ECI shock relocate, Panhard Bar kit, wheels & tires 1995 Z28 Convertible - Borla, K&N, Lingenfelter Motor, C6 Wheels & Tires 1990 2500 4x4 Suburban 3" Catbac System, K&N, 2" Lift, Wheels, Tires



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