Question about 1989 GMC Sierra

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Can i change a automati transmission to a manual on a GMC sierra 1989? engin is 5.7

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This is possible but would be difficult and expensive.Why would you want to?

Posted on Apr 02, 2011

Testimonial: "You ask why do i want to change transmission its going out. and i donot want to put another automatic traney in it. thanks my qustion was ancered."

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1 Answer

My 1989 gmc sierra slips in and out of gear. i hear that the transmissions in these year trucks have problems. is there anyway that i can install a heavier transmission so that i wont have this problem...


Quick question, have you replaced the trans filter yet? Check the trans fluid level and proper engine temp? Do a fluid change recently? Again, these are just question due to slipping gears.

Aug 21, 2013 | GMC Cars & Trucks

1 Answer

I need to know what kind of tranny fluid goes in a manual transmission on a 1989 gmc seirra with 305 its a stepside to. i put amsoil synthetic manual synchromesh transmission fluid in it but im worried...


Muncie 4 (117MM) speed---Lubricant Type---------80W-90 Gear Oil
Muncie 5LM60 (HM-290) 4 & 5 Speed ---------Lubricant Type------Syncromesh Trans Fluid T2850

Oil Capacity= 5 Speed (85mm & 109mm)--3.6 pt (US)
(New Venture Gear 4500)--8pt (US)

4 Speed= (85mm)--3.6pt (US)
(117mm)--8.4pt (US)


Hope this helped you ??

Jun 14, 2011 | 1989 GMC Sierra

1 Answer

What year/model transmissions will fit a 1989 GMC sierra, 2500, 350 engine, 2-wheel drive? Thanks


A.T., VIN model "C" (4x2), TH400, 6 cyl
A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-305 (5.0L)
}A}}400}466495" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-350 (5.7L)
}A}}400}466496" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH400, 8 cyl, 8-379 (6.2L, diesel)
E>}B}}400}466497" type="radio" name="userInterchange" />A.T., VIN model "C" (4x2), TH700, diesel
A.T., VIN model "K" (4x4), TH400, 6 cyl
B@}}}400}466499" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH400, 8 cyl, diesel
A.T., VIN model "K" (4x4), TH400, 8 cyl, gasoline
A.T., VIN model "K" (4x4), TH700, diesel
FFC}B}}400}466502" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "C"
FFC}A}}400}466503" type="radio" name="userInterchange" />M.T., 4 spd, 4x2, VIN model "R"
ECB}B}}400}466504" type="radio" name="userInterchange" />M.T., 4 spd, 4x4, (VIN model "K")
M.T., 5 spd, 4x2
M.T., 5 spd, 4x4
A.T., VIN model "C" (4x2), TH700, gasoline
F=A}B}}400}466508" type="radio" name="userInterchange" />A.T., VIN model "K" (4x4), TH700, gasoline
}B}}400}466509" type="radio" name="userInterchange" />A.T., VIN model "R" (4x2)

Jan 14, 2011 | 1989 GMC Sierra

2 Answers

Hello! i have a 1989 GMC sierra 1500 2 wheel drive 350 engine, and i would like to know what size transmission does it take? the one i have in the truck now it will go into reverse but not drive, it leaks...


I would try replacing the transmission filter and fluid. There 2 different transmissions that came in the truck, a THM 400 3 speed, 13 bolt fluid pan, and a THM 700-R4 4 speed, 16 bolt fluid pan.

May 13, 2010 | 1989 GMC Sierra

1 Answer

I have an 1989 GMC Sierra K1500(4x4)5-speed. grinds when going...


It may be the transmission input shaft bushing or bearing, located in the rear of the engine crankshaft, in front of the clutch assembly. If the bushing or bearing is dry (needs to be greased), the input shaft will still try to turn with the engine rpm, even though the clutch pedal is depressed. Also, the clutch disc may not be fully releasing, which could possibly be corrected by adjusting the clutch pedal linkage. good luck

Jul 26, 2017 | GMC Sierra 1500 Cars & Trucks

2 Answers

How do you change the freeze plugs on 1989 gmc 305


engine in or out? harder in.... you will not get all of them with the motor in and transmission connected, because there are freeze plugs behind the flywheel... get a freeze plug removal and replacement tool, drain engine coolant first...

Aug 10, 2009 | 1989 GMC Sierra

2 Answers

Fly wheel needs to be replaced


Yes you do. If it's 4x4, i find it easier to pull the motor.

May 04, 2009 | 1989 GMC Sierra

3 Answers

What transmission will fit in an 89 gmc sierra?


if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

Nov 20, 2008 | 1989 GMC Sierra

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