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Trans Question
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64 C-10
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Joined: 03 Aug 2006
Posts: 126

4152.74 points



PostPosted: Thu May 03, 2007 1:35 pm    Post subject: Trans Question Reply with quote

My 350 TH trans started acting up today a couple of times. It's a stock trans w/manual valve body and a 3000 stall converter.

I started off from a traffic light and the trans started dragging. it seemed like I had the brakes on. I shifted to second and it worked fine. It did the same thing on a couple more starts.

I'm stumped.

Any ideas ????

Thanks.
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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
71803.38 points


1933 Willys Coupe

PostPosted: Thu May 03, 2007 3:22 pm    Post subject: Reply with quote

I have had torque converters do that on 2 occasions behind my L88 with a 400.
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64 C-10
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PostPosted: Thu May 03, 2007 3:36 pm    Post subject: Reply with quote

Do you think I should replace the torque converter ??
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Thu May 03, 2007 3:43 pm    Post subject: Reply with quote

Transmission problems are usually slippage or shifting from what I've encountered. When my T400 had the same symptoms as yours I was at my wits end till pops told me to ditch the converter. That was 25 years ago and I don't think street converters have changed much.
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64 C-10
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PostPosted: Thu May 03, 2007 3:44 pm    Post subject: Reply with quote

Good advice and cheaper than a new trans. Laughing

Thanks.
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
347040.52 points


1969 Oldsmobile Cutlass

PostPosted: Thu May 03, 2007 3:57 pm    Post subject: Reply with quote

dont forget to flush out the trans cooler or you will put the metal from the bad converter back into your new one. i would change the trans filter too.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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64 C-10
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PostPosted: Fri May 04, 2007 7:54 am    Post subject: Reply with quote

Thanks for the advice.

Why just in 1st gear ? Second and third are fine and it always doesn't happen in first gear. I also noticed my engine temp a little higher than normal. Can you tell I don't know squat about converters ? Laughing

When purchasing a new converter, what should I look at. When I'm running 55 mph , my engine is turning about 2400 rpm's. Should I look for less stall ? Say a 2200 stall converter ?
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri May 04, 2007 1:19 pm    Post subject: Reply with quote

My guess is the Low/Reverse one way roller clutch. If it is junk the symptom you describe would exist.
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64 C-10
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PostPosted: Fri May 04, 2007 3:55 pm    Post subject: Reply with quote

Thanks Paul. I stopped by the shop today and the trans man said maybe the low/ reverse bands and clutches binding or something. I did drive the car again today with no problems. Go figure ?? Rolling Eyes

I'm scheduled for a trans pressure check on Thursday. Maybe that will tell the tale.

I did check the fluid level today and added a pint of trans fluid.

I'm almost convinced the problem is not with the stall converter.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri May 04, 2007 9:58 pm    Post subject: Reply with quote

if it is the low/reverse one way clutch. The trans has to be gutted it is in the very back. Upgrade it using a 700-R4 one it is twice a tall and has a lot better holding power. It drops right in too no mods necessary.
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Knarley Darley
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PostPosted: Mon May 07, 2007 1:00 am    Post subject: Reply with quote

Paul P good call on the roller clutch. That would be my call also. I doubt the converter is the problem in this case.
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64 C-10
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PostPosted: Fri May 11, 2007 11:28 am    Post subject: Reply with quote

Thanks for the great advice and diagnosis. The roller clutch is definately the problem. I'm getting a trans rebuild kit to solve the problem.

Another question: There is a car show this weekend near by so will it be OK to drive the car ?? When the trans binds, I just shift to second and drive on.
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Paul P
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PostPosted: Mon May 14, 2007 1:45 pm    Post subject: Reply with quote

Make sure to put the taller 700R4 clutch. It is cheap insurance against failure again.
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64 C-10
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PostPosted: Mon May 14, 2007 2:51 pm    Post subject: Reply with quote

I'll do just that. Thanks.

One more question : I'm running a 3000 stall converter. My engine idles at 1200 RPM's. When I put the trans in gear, the engine slows down and I can feel the trans go into gear. Is this normal with a stall converter or do I have a converter problem also ???
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beersngars
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Joined: 04 Feb 2006
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Location: Ohio
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1948 Chevrolet Coupe

PostPosted: Mon May 14, 2007 5:22 pm    Post subject: Reply with quote

64 C-10 wrote:
I'll do just that. Thanks.

One more question : I'm running a 3000 stall converter. My engine idles at 1200 RPM's. When I put the trans in gear, the engine slows down and I can feel the trans go into gear. Is this normal with a stall converter or do I have a converter problem also ???


Normal. Mine is 3500 stall and it kind of bangs in to gear particulary reverse.
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