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'93 Chevy 1500 Tranny problems
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PSand
New User
Dec 5, 2011, 6:10 PM
Post #1 of 5
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'93 Chevy 1500 Tranny problems
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Hi, I have a 1993 Chevrolet 1500 with a 5.0L motor and (I believe) a 4L60E transmission.
My problem is that when I am driving after about 10 to 15 minutes (in city) the transmission fails to shift from first to second, and into reverse from any gear. I recently replaced the U-joints and center support mount on the driveshaft. I have checked the fluid, by the book (Chilton manual) and it appears to be too full if anything. I did not drive it before checking though, so don't know if that makes a difference. There are no metal flakes that I can see on the dipstick, but there does appear to be a tiny bit of sludge on the very tip.
While driving, when accelerating from a stop (after perhaps 10 to 15 minutes) the truck would hesitate to shift into second. It would not respond to throttle immediately, (I took my foot off the gas twice before it would shift). When making a three point u-turn, I put the truck into reverse and it would not engage the reverse gear. However, after shutting down the truck and allowing it to sit for a few minutes only, it would operate normally but after a short time would start having the same issue.
In checking the fluid level according to the Chilton manual, it says to have engine running- parking brake on- then shift through each gear until down to first then back to park going through each gear as well. In doing this, what i noticed was that in shifting into Reverse from park, and all the way down to first, everything seemed/sounded normal. But on the return, shifting from 1st to 2nd, a kind of grating/grinding/rubbing noise could clearly be heard from under the truck, (possibly the drive shaft). Shifting from 2nd into Drive the noise ceased, and no noise was heard in Overdrive or neutral. However, going from Neutral to Reverse the same noise was heard as in 2nd and in park, no noise.
I have very little mechanical experience and none with transmissions, so I'm completely baffled by this problem.
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 5, 2011, 6:25 PM
Post #2 of 5
(7057 views)
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Re: '93 Chevy 1500 Tranny problems
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If you have no reverse, than it isn't an electrical problem. You either have a problem with the valve body or the low/reverse clutch. You could also have a line pressure issue, so line pressure should be monitored when the problem is occurring. More than likely the transmission will need an overhaul.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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PSand
New User
Dec 5, 2011, 6:35 PM
Post #3 of 5
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Re: '93 Chevy 1500 Tranny problems
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How do I monitor line pressure?
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 5, 2011, 6:44 PM
Post #4 of 5
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Re: '93 Chevy 1500 Tranny problems
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You monitor it with a transmission pressure gauge. There is a test port on the side of the transmission the gauge screws into so you can watch line pressure. You compare the pressure readings to a line pressure chart to see if they are within specs or not. Line pressure is only a part of the diagnostic process.
I can tell you if your having a no reverse problem, the valve body and apply components will have to be inspected. Your best bet is to swing into a shop that specializes in transmissions and have them diagnose the problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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PSand
New User
Dec 5, 2011, 8:55 PM
Post #5 of 5
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Re: '93 Chevy 1500 Tranny problems
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okay, thanks for the help. I'll update this thread when it gets fixed so you know what the fix was. Thanks again!
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