Transmission help

ironhorse · 02-26-2008, 12:59 PM

My 1994 chevy truck has a hard shift in all the gears and "BANGS" when it shifts into 2nd or 3rd and back down. What could this be? I bought it used and since then have replaced 2 busted motor mounts and a busted rear transmission mount (thinking this was the problem) but the banging and hard shift still exist. Any ideas? (A/T)

03chevy · 02-26-2008, 01:11 PM

hope this helps to get you started.PriorityActionPart TypeCause1Inspect Transmission (Capacity) Incorrect transmission fluid level

2Inspect Transmission Fluid Type Improper type or level of transmission fluid.

4Inspect Transmission Cable Detent (A/T) Damaged, worn, or incorrectly adjusted transmission detent cable.

5Inspect Transmission Cable Shift (A/T) Worn, or incorrectly adjusted transmission shift cable.

6Inspect Transmission Cable Shift (M/T) Worn, or incorrectly adjusted transmission shift cable.

7Inspect Transmission Control Solenoid Damaged or faulty transmission control solenoid or circuit.

9Inspect Transmission Kickdown Solenoid Faulty transmission kickdown solenoid or solenoid circuit.

10Inspect Transmission Modulator - (A/T) Worn leaking or faulty transmission modulator valve or vacuum system.

12Inspect Transmission Shift Linkage (Manual)Broken or improperly adjusted shift linkage.

14Inspect Transmission Temperature Sensor Damaged, worn, or faulty transmission temperature sensor or transmission temperature sensor circuit.

15Inspect Transmission Filter (A/T) Clogged or dirty transmission filter.

16Inspect Transmission Control Module Damaged or faulty transmission control module or circuit.

crabtruck · 02-26-2008, 01:19 PM

Welcome to the forum ironhorse.
Probably wouldn't hurt to read the trouble codes for ideas too.
Have you pulled those yet ?

ironhorse · 02-26-2008, 02:46 PM

I haven't pulled the trouble codes... don't know where to get them.

ironhorse · 02-26-2008, 02:48 PM

I will start checking these things out. Thanks. Just to let you know that the A/T has been rebuilt in hopes of fixing the problem.

my83432 · 02-26-2008, 03:15 PM

This could be as simple as a shift kit was added. If the builder was really good they might notice it but not if they' re not looking for it.

crabtruck · 02-26-2008, 04:26 PM

Trouble codes can be read for you by a local parts store for free maybe.
Otherwise do it yourself. Simple proceedure, you need a pencil and paper,
and you need a jumper wire (paper clip).
With the key on and the engine off, jump socket holes "A" and "B" of the ALDL.
That's located under the edge of dash, pointed at you, near brake release.
When you do that the check engine light will flash in a pattern of codes.
It will flash(blink) the codes it has stored and then will repeat the list of them.
In the event that no codes are stored, it will only flash a code twelve (1-2).
Let us know what codes you see and we will help with translation.
In this picture the ALDL connector is almost dead center.

jdfenske · 02-26-2008, 07:31 PM

odbi is quite limited for transmission information.

might need to attack it old school.

sounds mechanical.

crabtruck · 02-27-2008, 01:56 AM

Agreed that OBD-I is primitive but I do have a list of codes for it.
Mostly rooting around for more info.

ironhorse · 02-27-2008, 09:43 AM

only the trouble code 43 came up (other than 12 of course)

02-26-2008, 12:59 PM	#1
ironhorse Junior Member Join Date: Feb 2008 Posts: 8	Transmission help My 1994 chevy truck has a hard shift in all the gears and "BANGS" when it shifts into 2nd or 3rd and back down. What could this be? I bought it used and since then have replaced 2 busted motor mounts and a busted rear transmission mount (thinking this was the problem) but the banging and hard shift still exist. Any ideas? (A/T) Last edited by ironhorse; 02-26-2008 at 02:44 PM.

02-26-2008, 01:11 PM	#2
03chevy Senior Member Join Date: Dec 2006 Location: jax,fl Posts: 1,052	hope this helps to get you started.PriorityActionPart TypeCause1Inspect Transmission (Capacity) Incorrect transmission fluid level 2Inspect Transmission Fluid Type Improper type or level of transmission fluid. 4Inspect Transmission Cable Detent (A/T) Damaged, worn, or incorrectly adjusted transmission detent cable. 5Inspect Transmission Cable Shift (A/T) Worn, or incorrectly adjusted transmission shift cable. 6Inspect Transmission Cable Shift (M/T) Worn, or incorrectly adjusted transmission shift cable. 7Inspect Transmission Control Solenoid Damaged or faulty transmission control solenoid or circuit. 9Inspect Transmission Kickdown Solenoid Faulty transmission kickdown solenoid or solenoid circuit. 10Inspect Transmission Modulator - (A/T) Worn leaking or faulty transmission modulator valve or vacuum system. 12Inspect Transmission Shift Linkage (Manual)Broken or improperly adjusted shift linkage. 14Inspect Transmission Temperature Sensor Damaged, worn, or faulty transmission temperature sensor or transmission temperature sensor circuit. 15Inspect Transmission Filter (A/T) Clogged or dirty transmission filter. 16Inspect Transmission Control Module Damaged or faulty transmission control module or circuit. __________________ A dirty mind is a terrible thing to waste!

02-26-2008, 07:31 PM	#8
jdfenske Senior Member Join Date: Jan 2008 Posts: 105	odbi is quite limited for transmission information. might need to attack it old school. sounds mechanical. __________________ 1996 Z71 white shortbox tinted 350 30 over cats and X pipe Alumhds ported 210 cc runners 62 cc chambers 2" int 1.550" ex crane lift; 580/580 duration; 216/222 4L60E w/shiftkit

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02-26-2008, 01:19 PM	#3
crabtruck Senior Member Join Date: Jul 2007 Posts: 1,474	Welcome to the forum ironhorse. Probably wouldn't hurt to read the trouble codes for ideas too. Have you pulled those yet ?

02-26-2008, 02:46 PM	#4
ironhorse Junior Member Join Date: Feb 2008 Posts: 8	I haven't pulled the trouble codes... don't know where to get them.

02-26-2008, 02:48 PM	#5
ironhorse Junior Member Join Date: Feb 2008 Posts: 8	I will start checking these things out. Thanks. Just to let you know that the A/T has been rebuilt in hopes of fixing the problem.

02-26-2008, 03:15 PM	#6
my83432 Full Member Join Date: Feb 2008 Location: Madison, WI Posts: 25	This could be as simple as a shift kit was added. If the builder was really good they might notice it but not if they' re not looking for it.

02-26-2008, 04:26 PM	#7
crabtruck Senior Member Join Date: Jul 2007 Posts: 1,474	Trouble codes can be read for you by a local parts store for free maybe. Otherwise do it yourself. Simple proceedure, you need a pencil and paper, and you need a jumper wire (paper clip). With the key on and the engine off, jump socket holes "A" and "B" of the ALDL. That's located under the edge of dash, pointed at you, near brake release. When you do that the check engine light will flash in a pattern of codes. It will flash(blink) the codes it has stored and then will repeat the list of them. In the event that no codes are stored, it will only flash a code twelve (1-2). Let us know what codes you see and we will help with translation. In this picture the ALDL connector is almost dead center.

02-27-2008, 01:56 AM	#9
crabtruck Senior Member Join Date: Jul 2007 Posts: 1,474	Agreed that OBD-I is primitive but I do have a list of codes for it. Mostly rooting around for more info.

02-27-2008, 09:43 AM	#10
ironhorse Junior Member Join Date: Feb 2008 Posts: 8	only the trouble code 43 came up (other than 12 of course)