Signs of a tranny about to go?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lukecp · 06-10-2002, 12:36 PM

Well, i'm kinda worried about the TH350 in my truck. What are the signs it will make if it is about to go out? Sometimes, when the engine is cold, and i go to take off, it will slip for about one second, then catch and take off. Also, it takes it quite a while to go in reverse, i mean if i put the shifter to the R position, i have to wait a while for it to go in gear so i can back up. When i'm driving, with the throttle about 1/2 way down, it won't shift out of second gear until almost 4000 rpm, and the shift will take longer than it used to....as you can see im pretty worried about it. I checked the fluid, it is nice, red, and plenty full. Could it be the modulator causing it to shift so late? It only does it when i put the gas about 1/2 way down, the rest of the time it shifts fine. I changed the pan gasket about 5 months ago too, and all the fluid that was in the pan. I noticed that 2 valve body bolts were in the pan, so i put them back in. Should i be expecting to spend some money on a new tranny in the future? I may just go ahead and upgrade to a 700R4 if i'm gonna do that.....sigh...time for a bank loan :S.

chevy72402 · 06-10-2002, 02:42 PM

sounds like a pump problem. In reverse the tranny generates twice the line pressure. so if the pump is going out it would take a while for the pressure to build up. If it has been this way for awhile I would suggest a rebuild as clutches have been slipping and creating heat which in turn kills trannies. check with your local tranny shop and see what they think though.

lukecp · 06-10-2002, 04:18 PM

Thanks for the help. I wasn't going to replace my TH350 for a 700R4 is it was in good working order...but i guess not. I called around and found a 700R4 to rebuild for $45, and a reputable tranny shop that will rebuild it, and retrofit it into my truck. I dunno what the conversion will cost, but $800 to rebuild the tranny....

Longhorn Man · 06-10-2002, 07:51 PM

As for teh dealyed shifting, try readjusting the kick down. It has probably been messed with in a carb swap or when a nonstock intake was installed. (asuming these 2 items have been messed with)

06-10-2002, 12:36 PM	#1
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Signs of a tranny about to go?? Well, i'm kinda worried about the TH350 in my truck. What are the signs it will make if it is about to go out? Sometimes, when the engine is cold, and i go to take off, it will slip for about one second, then catch and take off. Also, it takes it quite a while to go in reverse, i mean if i put the shifter to the R position, i have to wait a while for it to go in gear so i can back up. When i'm driving, with the throttle about 1/2 way down, it won't shift out of second gear until almost 4000 rpm, and the shift will take longer than it used to....as you can see im pretty worried about it. I checked the fluid, it is nice, red, and plenty full. Could it be the modulator causing it to shift so late? It only does it when i put the gas about 1/2 way down, the rest of the time it shifts fine. I changed the pan gasket about 5 months ago too, and all the fluid that was in the pan. I noticed that 2 valve body bolts were in the pan, so i put them back in. Should i be expecting to spend some money on a new tranny in the future? I may just go ahead and upgrade to a 700R4 if i'm gonna do that.....sigh...time for a bank loan :S. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

06-10-2002, 02:42 PM	#2
chevy72402 FARMER/RANCHER Join Date: Apr 2001 Location: SD Posts: 597	sounds like a pump problem. In reverse the tranny generates twice the line pressure. so if the pump is going out it would take a while for the pressure to build up. If it has been this way for awhile I would suggest a rebuild as clutches have been slipping and creating heat which in turn kills trannies. check with your local tranny shop and see what they think though. __________________ 1972 chevy super, long box, 402 big block (2,000 miles on rebuild) 2wd tach, tilt, tool box on bedside, a/c, sliding rear window, orange and white. 1972 Chevy Blazer 2wd, tach, tilt, a/c, my first engine overhauling experience, Orange, with white top 2006 Gmc Sierra, XM, Z-71, dark blue, onstar, leather, rear entertainment (audio only) heated seats, (the wife loves that feature) upgraded tires immediately after purchase to Goodyear Wrangler AT/S (hate those rock throwers that come from the factory) BWC

06-10-2002, 04:18 PM	#3
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Thanks for the help. I wasn't going to replace my TH350 for a 700R4 is it was in good working order...but i guess not. I called around and found a 700R4 to rebuild for $45, and a reputable tranny shop that will rebuild it, and retrofit it into my truck. I dunno what the conversion will cost, but $800 to rebuild the tranny.... __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

06-10-2002, 07:51 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	As for teh dealyed shifting, try readjusting the kick down. It has probably been messed with in a carb swap or when a nonstock intake was installed. (asuming these 2 items have been messed with)



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