A couple questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Albatrossian · 07-10-2008, 09:23 PM

First.. I was wrong about the trans in my truck.. it's a 700. I don't know how they got the lockup to work because I don't see any wires. What I'd like to know is where I can get the correct throttle cable bracket to work with my QJet. The truck is shifting way too fast out of first.
Second, what kind of rear gears usually came in a 250 straight six with an automatic?

D13 · 07-11-2008, 06:12 AM

OK, let's back up. Truck is an 81 with a 355 and a Qjet and a 700R4 4-speed auto, right (no vacuum modulator on trans)? And your problem is the trans shifts 1-2 too early?

Why do you think the bracket is wrong? Badically any SBC truck bracket 83-86 would work.

But did you try adjusting the cable? Push in the retainer until you can push the cable end back into the sheath. Release the retainer. Now open the throttle fully at the carb (not at the pedal). The cable should ratchet out. This is the way the factory set them.

Shortening the cable will increase line pressure and delay all the shifts slightly.

If your TCC is working then there must be a wire to it. Period. It can be wired to apply in 4th gear by using a pressure switch inside th trans. Remember, 4th gear is not TCC. You should be shifting into 4th around 45-50 on light throttle, then the TCC should apply and drop 3-400 rpm.

Gears were most likely 3.08 or 3.23. Look to see if the parts sticker is still inside the glove box door.

**LEEVON** · 07-11-2008, 09:18 AM

Try adjusting the cable like D13 said, if that doesn't work I would stop driving until the problem is fixed because the 700 is easily burned up without correct line pressure. If you can't adjust the cable correctly, you can get the right brackets from www.bowtieoverdrives.com.

The TCC wires come from a 4-pin connector on the driver's side, if it's missing then you're not hooked up. If it's there, check where it goes and check to see that you're getting 12v.

Albatrossian · 07-11-2008, 09:54 PM

I adjusted the cable and it shifts hard and at the right time.. thank god. No lockup, though. Is there a way to get it to lock up without going into the trans?

Albatrossian · 07-12-2008, 10:46 PM

Welp, looks like the trans was on it's way out when they parked the truck.. No 3rd gear now. I think I'm just going to go back to a TH350. Anyone got a ballpark price on what a good used TH350 would cost?

07-10-2008, 09:23 PM	#1
Albatrossian Georgia Boy Join Date: Jun 2008 Location: Douglas, Georgia Posts: 370	A couple questions First.. I was wrong about the trans in my truck.. it's a 700. I don't know how they got the lockup to work because I don't see any wires. What I'd like to know is where I can get the correct throttle cable bracket to work with my QJet. The truck is shifting way too fast out of first. Second, what kind of rear gears usually came in a 250 straight six with an automatic?

07-11-2008, 06:12 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: A couple questions OK, let's back up. Truck is an 81 with a 355 and a Qjet and a 700R4 4-speed auto, right (no vacuum modulator on trans)? And your problem is the trans shifts 1-2 too early? Why do you think the bracket is wrong? Badically any SBC truck bracket 83-86 would work. But did you try adjusting the cable? Push in the retainer until you can push the cable end back into the sheath. Release the retainer. Now open the throttle fully at the carb (not at the pedal). The cable should ratchet out. This is the way the factory set them. Shortening the cable will increase line pressure and delay all the shifts slightly. If your TCC is working then there must be a wire to it. Period. It can be wired to apply in 4th gear by using a pressure switch inside th trans. Remember, 4th gear is not TCC. You should be shifting into 4th around 45-50 on light throttle, then the TCC should apply and drop 3-400 rpm. Gears were most likely 3.08 or 3.23. Look to see if the parts sticker is still inside the glove box door. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

07-11-2008, 09:18 AM	#3
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,893	Re: A couple questions Try adjusting the cable like D13 said, if that doesn't work I would stop driving until the problem is fixed because the 700 is easily burned up without correct line pressure. If you can't adjust the cable correctly, you can get the right brackets from www.bowtieoverdrives.com. The TCC wires come from a 4-pin connector on the driver's side, if it's missing then you're not hooked up. If it's there, check where it goes and check to see that you're getting 12v. __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids

07-11-2008, 09:54 PM	#4
Albatrossian Georgia Boy Join Date: Jun 2008 Location: Douglas, Georgia Posts: 370	Re: A couple questions I adjusted the cable and it shifts hard and at the right time.. thank god. No lockup, though. Is there a way to get it to lock up without going into the trans?

07-12-2008, 10:46 PM	#5
Albatrossian Georgia Boy Join Date: Jun 2008 Location: Douglas, Georgia Posts: 370	Re: A couple questions Welp, looks like the trans was on it's way out when they parked the truck.. No 3rd gear now. I think I'm just going to go back to a TH350. Anyone got a ballpark price on what a good used TH350 would cost?



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