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I have a 1978, 2wd, old chevy pickup with a 305 engine in it. It has a automatic transmission. It recently has not been wanting to shift into reverse. Any help?

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  • Cars & Trucks Master
  • 2,002 Answers

I'm assuming that you checked the fluid and it's full. If the fluid was low and you had to top it up, did you run the tranny through the gears, stopping at each gear for a couple seconds? Do this a couple times, down and up. When was the last time you changed the fluid and filter, every 80-100,000 miles.
Check that the vacuum is good to the modulator valve, round thing at top rear on passenger side of transmission. Remove it and tip it down, if any oil comes out replace it.
You could try adding some Lucas Trans Treatment. If this helps, you are looking for a rebuild or another transmission in the reasonably near future. Read the instructions on the back of the bottle.

Posted on Oct 16, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1998 Chevy S10 pickup backup lights don't work

Yes it screws in on right side of tramission and you will need a 7/8 inch deep socket to remove it. You may be able to clean the old one once it is removed. There is a little ball thatgets dirty and may you can get by with cleaning it. Good Luck. Ed

Posted on Sep 06, 2008

emissionwiz
  • 75744 Answers

SOURCE: 97 gmc pickup with automatic transmission trouble

1st thing to do is test the system for codes, the problem is most likely a failed or stuck shift solenoid indside the trans, have you ever serviced the trans, sometimes a fluid and filter cahnge will cure these kinds of issues.

Posted on Nov 02, 2008

  • 1 Answer

SOURCE: Erratic shifting on 2001 f150 pickup

How many miles on it? Do you mean overdrive? Over drive will clunk when shifting in cruise. Mine lasted 212,000 miles but I have heard of them going out after 120,000, depends how you drive. That Traney is good till it starts acting up then you will need a complete overhaul. I got it done for $1800. Do not go to a Ford dealer, they quoted me $3200.
Jeepgreg

Posted on Dec 19, 2008

localwonder
  • 6784 Answers

SOURCE: Hi, I have a 1998 Chevy 3/4 ton 4x4, automatic

Yes, you are correct. i would change the filter as well. check the torque converter for stress.

Posted on Feb 28, 2009

  • 1 Answer

SOURCE: transmission on my 2000 chevy k2500 4x4 pickup

your transmission has possibly been rebuilt with stronger springs put in. No worries. have been running mine for along while without any problems. Better this than slipping, but it is a bit annoying.

Posted on Jul 04, 2009

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jturcotte_2426.gif

Fig. Fig. 49: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission

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Fig. Fig. 50: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate

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Fig. Fig. 51: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission

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Fig. Fig. 52: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate

jturcotte_2430.gif

Fig. Fig. 53: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with manual transmission

jturcotte_2431.gif

Fig. Fig. 54: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with manual transmission alternate

jturcotte_2432.gif

Fig. Fig. 55: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission

jturcotte_2433.gif

Fig. Fig. 56: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission alternate

jturcotte_2434.gif

Fig. Fig. 57: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with manual transmission alternate

jturcotte_2435.gif

Fig. Fig. 58: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate

jturcotte_2436.gif

Fig. Fig. 59: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate

jturcotte_2437.gif

Fig. Fig. 60: 1984 305 (5.0L) V8 engine-4bbl federal and low altitude with automatic transmission alternate

jturcotte_2438.gif

Fig. Fig. 61: 1984 305 (5.0L) V8 engine-4bbl federal and high altitude with automatic transmission alternate

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Fig. 100: Chevy 305 (5.0L) V8 engine-federal with automatic transmission alternate

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Fig. 101: Chevy 305 (5.0L) V8 engine-California with automatic transmission alternate

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