Trans Issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevy1TonFun · 06-03-2010, 02:42 AM

Ok, So I just finished the motor on my truck. I take it out for a test drive with the newly rebuilt Turbo 400 with stage 2 shift kit, and a high performance torque converter with a . I bypassed the radiator and went straight to a oil cooler for the trans and I have the vacuum line hooked up to the carb. Now when I took it out, it didn't seem to have the kick I expected. It doesn't shift hard and feels like motor is giving the trans more than enough power, but no output from the trans. The only thing I can think of it that my stall is too hight on the TC or something with the trans cooler. Any ideas?

Jobow · 06-03-2010, 08:22 AM

I'm guessing that you have put the vaccum line back on the modulator since the picture was taken.

Chevy1TonFun · 06-03-2010, 10:46 AM

Quote:

Originally Posted by Jobow

I'm guessing that you have put the vaccum line back on the modulator since the picture was taken.

the picture is old. I have that line hooked up.

66skylarkpost · 06-03-2010, 11:07 AM

i'm not sure whats the differnce you are feeling . did you have a 400 before ? as a 400 has a higher first gear and takes more power to operate than a 350 turbo . on a side note i would put some sort of grommets around those lines where the pass thru sheetmetal

Scrat · 06-04-2010, 01:30 AM

When I had my T400 rebuilt the guys forgot to put the "plunger" (not sure of the real name) in before putting the vacuum modulator in. The tranny worked but shifted really soft. I drove the truck 160 miles home and the next day found the problem (the missing plunger). Got a new one, pulled the modulator out, stuck the missing plunger in the hole, reinstalled the modulator and it was shifting like the beast it should. Hopefully its an easy fix like mine was.

Chevy1TonFun · 06-07-2010, 11:09 PM

turns out the stall was set WAY to high. I don't know what the guy was thinking when he was putting it together. So a new one covered under warranty is on its way.

06-03-2010, 02:42 AM	#1
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	Trans Issues Ok, So I just finished the motor on my truck. I take it out for a test drive with the newly rebuilt Turbo 400 with stage 2 shift kit, and a high performance torque converter with a . I bypassed the radiator and went straight to a oil cooler for the trans and I have the vacuum line hooked up to the carb. Now when I took it out, it didn't seem to have the kick I expected. It doesn't shift hard and feels like motor is giving the trans more than enough power, but no output from the trans. The only thing I can think of it that my stall is too hight on the TC or something with the trans cooler. Any ideas? __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12 Last edited by Chevy1TonFun; 06-03-2010 at 02:49 AM. Reason: added pictures

06-03-2010, 08:22 AM	#2
Jobow Registered User Join Date: Mar 2009 Location: Columbia, MO Posts: 11	Re: Trans Issues I'm guessing that you have put the vaccum line back on the modulator since the picture was taken. __________________ 1970 Chevy 3-door Surb (in progress)

06-03-2010, 11:07 AM	#4
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: Trans Issues i'm not sure whats the differnce you are feeling . did you have a 400 before ? as a 400 has a higher first gear and takes more power to operate than a 350 turbo . on a side note i would put some sort of grommets around those lines where the pass thru sheetmetal __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car

06-04-2010, 01:30 AM	#5
Scrat Registered User Join Date: Nov 2009 Location: Mesa AZ Posts: 30	Re: Trans Issues When I had my T400 rebuilt the guys forgot to put the "plunger" (not sure of the real name) in before putting the vacuum modulator in. The tranny worked but shifted really soft. I drove the truck 160 miles home and the next day found the problem (the missing plunger). Got a new one, pulled the modulator out, stuck the missing plunger in the hole, reinstalled the modulator and it was shifting like the beast it should. Hopefully its an easy fix like mine was.

06-07-2010, 11:09 PM	#6
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	Re: Trans Issues turns out the stall was set WAY to high. I don't know what the guy was thinking when he was putting it together. So a new one covered under warranty is on its way. __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12



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